<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019c8b5b-268b-7b80-85a2-283fa5bcd631,g:8cb58307-8fca-4abd-ad1d-175e984c4d25-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/CoverPage" xlink:type="simple" xlink:href="lkq-20260331.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsLineItems_019c8b5b-2815-7f9e-a2f5-9ab6aedf7cad" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityListingsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsTable_019c8b5b-2815-7103-8b46-5bb96c6c58b5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityListingsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityListingsLineItems_019c8b5b-2815-7f9e-a2f5-9ab6aedf7cad" xlink:to="loc_dei_EntityListingsTable_019c8b5b-2815-7103-8b46-5bb96c6c58b5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c8b5b-2815-7b51-9333-e4be1664caf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntityListingsTable_019c8b5b-2815-7103-8b46-5bb96c6c58b5" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c8b5b-2815-7b51-9333-e4be1664caf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c8b5b-2815-7b51-9333-e4be1664caf6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c8b5b-2815-7b51-9333-e4be1664caf6" xlink:to="loc_us-gaap_ClassOfStockDomain_019c8b5b-2815-7b51-9333-e4be1664caf6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c8b5b-2815-7956-87aa-db5b8a46cd02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c8b5b-2815-7b51-9333-e4be1664caf6" xlink:to="loc_us-gaap_ClassOfStockDomain_019c8b5b-2815-7956-87aa-db5b8a46cd02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_CommonStockParValue.01PerShareMember_019c8b5b-2815-72ed-84e8-b0d8e5fc2cf0" xlink:href="lkq-20260331.xsd#lkq_CommonStockParValue.01PerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c8b5b-2815-7956-87aa-db5b8a46cd02" xlink:to="loc_lkq_CommonStockParValue.01PerShareMember_019c8b5b-2815-72ed-84e8-b0d8e5fc2cf0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuroNotes2031Member_019c8b5b-2815-7c01-9f3b-2d1b7a0f5b0b" xlink:href="lkq-20260331.xsd#lkq_EuroNotes2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c8b5b-2815-7956-87aa-db5b8a46cd02" xlink:to="loc_lkq_EuroNotes2031Member_019c8b5b-2815-7c01-9f3b-2d1b7a0f5b0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019c8b5b-2815-7023-9c61-bf0b2c1b5a57" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_019c8b5b-2815-7f9e-a2f5-9ab6aedf7cad" xlink:to="loc_dei_Security12bTitle_019c8b5b-2815-7023-9c61-bf0b2c1b5a57" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019c8b5b-2815-7f3e-ade1-0f3f35bdb8c5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_019c8b5b-2815-7f9e-a2f5-9ab6aedf7cad" xlink:to="loc_dei_TradingSymbol_019c8b5b-2815-7f3e-ade1-0f3f35bdb8c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019c8b5b-2815-7386-8b32-482d81b0f2da" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_019c8b5b-2815-7f9e-a2f5-9ab6aedf7cad" xlink:to="loc_dei_SecurityExchangeName_019c8b5b-2815-7386-8b32-482d81b0f2da" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/ConsolidatedStatementsofIncome" xlink:type="simple" xlink:href="lkq-20260331.xsd#ConsolidatedStatementsofIncome"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/ConsolidatedStatementsofIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c8b5b-2815-796f-91f7-552b5e81fbd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c8b5b-2815-7cc8-917c-033afc4b8f40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-796f-91f7-552b5e81fbd3" xlink:to="loc_us-gaap_StatementTable_019c8b5b-2815-7cc8-917c-033afc4b8f40" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-2815-7a30-bade-33c2c085b615" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c8b5b-2815-7cc8-917c-033afc4b8f40" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-2815-7a30-bade-33c2c085b615" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-2815-7a30-bade-33c2c085b615_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-2815-7a30-bade-33c2c085b615" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-2815-7a30-bade-33c2c085b615_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-2815-731e-8189-6e3f4a148897" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-2815-7a30-bade-33c2c085b615" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-2815-731e-8189-6e3f4a148897" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/ConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="lkq-20260331.xsd#ConsolidatedStatementsofCashFlows"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/ConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c8b5b-2815-7260-adf9-c2d7f4e72b14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c8b5b-2815-7f7e-9ab4-f8e12c0b6078" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7260-adf9-c2d7f4e72b14" xlink:to="loc_us-gaap_StatementTable_019c8b5b-2815-7f7e-9ab4-f8e12c0b6078" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ConsolidatedCashFlowAxis_019c8b5b-2815-7931-9406-61d0a20d8408" xlink:href="lkq-20260331.xsd#lkq_ConsolidatedCashFlowAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c8b5b-2815-7f7e-9ab4-f8e12c0b6078" xlink:to="loc_lkq_ConsolidatedCashFlowAxis_019c8b5b-2815-7931-9406-61d0a20d8408" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ConsolidatedCashFlowDomain_019c8b5b-2815-7931-9406-61d0a20d8408_default" xlink:href="lkq-20260331.xsd#lkq_ConsolidatedCashFlowDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lkq_ConsolidatedCashFlowAxis_019c8b5b-2815-7931-9406-61d0a20d8408" xlink:to="loc_lkq_ConsolidatedCashFlowDomain_019c8b5b-2815-7931-9406-61d0a20d8408_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ConsolidatedCashFlowDomain_019c8b5b-2815-7d89-8974-51b145da8d1d" xlink:href="lkq-20260331.xsd#lkq_ConsolidatedCashFlowDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lkq_ConsolidatedCashFlowAxis_019c8b5b-2815-7931-9406-61d0a20d8408" xlink:to="loc_lkq_ConsolidatedCashFlowDomain_019c8b5b-2815-7d89-8974-51b145da8d1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-2815-78d6-86be-255c390e8ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c8b5b-2815-7f7e-9ab4-f8e12c0b6078" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-2815-78d6-86be-255c390e8ec7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-2815-78d6-86be-255c390e8ec7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-2815-78d6-86be-255c390e8ec7" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-2815-78d6-86be-255c390e8ec7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-2815-7a38-866f-bf87999c7a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-2815-78d6-86be-255c390e8ec7" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-2815-7a38-866f-bf87999c7a2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuroNotes2031Member_019c8b5b-2815-73f7-9b0c-ed117b2d1d8c" xlink:href="lkq-20260331.xsd#lkq_EuroNotes2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-2815-7a38-866f-bf87999c7a2a" xlink:to="loc_lkq_EuroNotes2031Member_019c8b5b-2815-73f7-9b0c-ed117b2d1d8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuroNotes2024Member_019c8b5b-2815-79f8-a963-0a0a70df4f8d" xlink:href="lkq-20260331.xsd#lkq_EuroNotes2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-2815-7a38-866f-bf87999c7a2a" xlink:to="loc_lkq_EuroNotes2024Member_019c8b5b-2815-79f8-a963-0a0a70df4f8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember_019c8b5b-2815-7a18-98bc-1d32e643d3f4" xlink:href="lkq-20260331.xsd#lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-2815-7a38-866f-bf87999c7a2a" xlink:to="loc_lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember_019c8b5b-2815-7a18-98bc-1d32e643d3f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019c8b5b-2815-7dc0-9833-4bffd54b4387" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c8b5b-2815-7f7e-9ab4-f8e12c0b6078" xlink:to="loc_us-gaap_CreditFacilityAxis_019c8b5b-2815-7dc0-9833-4bffd54b4387" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c8b5b-2815-7dc0-9833-4bffd54b4387_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019c8b5b-2815-7dc0-9833-4bffd54b4387" xlink:to="loc_us-gaap_CreditFacilityDomain_019c8b5b-2815-7dc0-9833-4bffd54b4387_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c8b5b-2815-783a-af31-4c97726f6001" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019c8b5b-2815-7dc0-9833-4bffd54b4387" xlink:to="loc_us-gaap_CreditFacilityDomain_019c8b5b-2815-783a-af31-4c97726f6001" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c8b5b-2815-7dfc-9716-f927637ee67d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019c8b5b-2815-783a-af31-4c97726f6001" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c8b5b-2815-7dfc-9716-f927637ee67d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019ddec2-2498-7a7f-9729-f4355a83a908" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c8b5b-2815-7f7e-9ab4-f8e12c0b6078" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019ddec2-2498-7a7f-9729-f4355a83a908" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019ddec2-2498-7a7f-9729-f4355a83a908_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019ddec2-2498-7a7f-9729-f4355a83a908" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019ddec2-2498-7a7f-9729-f4355a83a908_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019ddec2-2498-760a-a2f2-f45c42d9acb9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019ddec2-2498-7a7f-9729-f4355a83a908" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019ddec2-2498-760a-a2f2-f45c42d9acb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_MekonomenMember_019ddec2-498a-7818-ba7e-55df3275923a" xlink:href="lkq-20260331.xsd#lkq_MekonomenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019ddec2-2498-760a-a2f2-f45c42d9acb9" xlink:to="loc_lkq_MekonomenMember_019ddec2-498a-7818-ba7e-55df3275923a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c8b5b-2815-7ab7-a4ee-13c444ee3770" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7260-adf9-c2d7f4e72b14" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c8b5b-2815-7ab7-a4ee-13c444ee3770" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019c8b5b-2815-7bed-91c9-ac63fc02d094" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c8b5b-2815-7ab7-a4ee-13c444ee3770" xlink:to="loc_us-gaap_ProfitLoss_019c8b5b-2815-7bed-91c9-ac63fc02d094" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c8b5b-2815-7037-8a14-c1072368a228" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c8b5b-2815-7ab7-a4ee-13c444ee3770" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c8b5b-2815-7037-8a14-c1072368a228" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019c8b5b-2815-7266-8006-c4e57486cca0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c8b5b-2815-7037-8a14-c1072368a228" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019c8b5b-2815-7266-8006-c4e57486cca0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_019dd5c8-ee8b-7978-bd49-99db481bfb5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c8b5b-2815-7037-8a14-c1072368a228" xlink:to="loc_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_019dd5c8-ee8b-7978-bd49-99db481bfb5d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c8b5b-2815-7ede-8eaf-fd7de9788c58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c8b5b-2815-7037-8a14-c1072368a228" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c8b5b-2815-7ede-8eaf-fd7de9788c58" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_019c8b5b-2815-7faf-aa6b-87c53994ccf8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c8b5b-2815-7037-8a14-c1072368a228" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_019c8b5b-2815-7faf-aa6b-87c53994ccf8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c8b5b-2815-79c7-821a-e9bd1bb2f244" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c8b5b-2815-7037-8a14-c1072368a228" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c8b5b-2815-79c7-821a-e9bd1bb2f244" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_019c8b5b-2815-7b49-89e0-6b96a4f5bd84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c8b5b-2815-79c7-821a-e9bd1bb2f244" xlink:to="loc_us-gaap_IncreaseDecreaseInReceivables_019c8b5b-2815-7b49-89e0-6b96a4f5bd84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_019c8b5b-2815-78a1-8242-2d3beb7a534e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c8b5b-2815-79c7-821a-e9bd1bb2f244" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_019c8b5b-2815-78a1-8242-2d3beb7a534e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019c8b5b-2815-75d2-9858-424ed0901c4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c8b5b-2815-79c7-821a-e9bd1bb2f244" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019c8b5b-2815-75d2-9858-424ed0901c4f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_019c8b5b-2815-7130-8398-90699589be4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c8b5b-2815-79c7-821a-e9bd1bb2f244" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_019c8b5b-2815-7130-8398-90699589be4f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019c8b5b-2815-774b-9387-14b1762e5b90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c8b5b-2815-79c7-821a-e9bd1bb2f244" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019c8b5b-2815-774b-9387-14b1762e5b90" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019c8b5b-2815-75fd-87b6-e4a61f0166bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c8b5b-2815-79c7-821a-e9bd1bb2f244" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019c8b5b-2815-75fd-87b6-e4a61f0166bb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_IncreaseDecreaseInOperatingLeaseAssetsAndLiabilities_019c8b5b-2815-7394-b011-ac76fddc8608" xlink:href="lkq-20260331.xsd#lkq_IncreaseDecreaseInOperatingLeaseAssetsAndLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c8b5b-2815-79c7-821a-e9bd1bb2f244" xlink:to="loc_lkq_IncreaseDecreaseInOperatingLeaseAssetsAndLiabilities_019c8b5b-2815-7394-b011-ac76fddc8608" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019c8b5b-2815-7840-aa68-4832db283196" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c8b5b-2815-7037-8a14-c1072368a228" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019c8b5b-2815-7840-aa68-4832db283196" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c8b5b-2815-7b53-9b9e-f9febe6f49b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7260-adf9-c2d7f4e72b14" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c8b5b-2815-7b53-9b9e-f9febe6f49b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_019c8b5b-2815-7d9e-9358-303ea4fa8916" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c8b5b-2815-7b53-9b9e-f9febe6f49b1" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_019c8b5b-2815-7d9e-9358-303ea4fa8916" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019c8b5b-2815-74f5-92c8-0f7b8e3a028b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c8b5b-2815-7b53-9b9e-f9febe6f49b1" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019c8b5b-2815-74f5-92c8-0f7b8e3a028b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_019c8b5b-2815-774f-b0ac-99478482aaa1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c8b5b-2815-7b53-9b9e-f9febe6f49b1" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_019c8b5b-2815-774f-b0ac-99478482aaa1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019c8b5b-2815-79ad-b36e-3ead5a5609c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c8b5b-2815-7b53-9b9e-f9febe6f49b1" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019c8b5b-2815-79ad-b36e-3ead5a5609c7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7260-adf9-c2d7f4e72b14" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019c8b5b-2815-77a5-bd60-3996f20f306f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019c8b5b-2815-77a5-bd60-3996f20f306f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ProceedsFromIssuanceOfU.S.Notes202833NetOfUnamortizedBondDiscount_019c8b5b-2815-72e2-9af2-d05a6248d950" xlink:href="lkq-20260331.xsd#lkq_ProceedsFromIssuanceOfU.S.Notes202833NetOfUnamortizedBondDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_lkq_ProceedsFromIssuanceOfU.S.Notes202833NetOfUnamortizedBondDiscount_019c8b5b-2815-72e2-9af2-d05a6248d950" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_019c8b5b-2815-7252-92c1-a8b15c0b3c46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_019c8b5b-2815-7252-92c1-a8b15c0b3c46" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_019c8b5b-2815-719e-9a92-86077e1a0a48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_019c8b5b-2815-719e-9a92-86077e1a0a48" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfOtherDebt_019c8b5b-2815-785e-b96a-c9b8efd584bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromRepaymentsOfOtherDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfOtherDebt_019c8b5b-2815-785e-b96a-c9b8efd584bb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ProceedsFromIssuanceOfEuroNotes2031NetOfUnamortizedBondDiscount_019c8b5b-2815-7e39-9d93-56bbda3fbbbf" xlink:href="lkq-20260331.xsd#lkq_ProceedsFromIssuanceOfEuroNotes2031NetOfUnamortizedBondDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_lkq_ProceedsFromIssuanceOfEuroNotes2031NetOfUnamortizedBondDiscount_019c8b5b-2815-7e39-9d93-56bbda3fbbbf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSeniorDebt_019c8b5b-2815-74e5-b92c-d2a6a30a3d82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfSeniorDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_us-gaap_RepaymentsOfSeniorDebt_019c8b5b-2815-74e5-b92c-d2a6a30a3d82" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromBankDebt_019c8b5b-2815-7c95-981e-8db2b30f02d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromBankDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_us-gaap_ProceedsFromBankDebt_019c8b5b-2815-7c95-981e-8db2b30f02d4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromHedgeFinancingActivities_019c8b5b-2815-7c1d-9744-41a06fe2a325" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromHedgeFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_us-gaap_PaymentsForProceedsFromHedgeFinancingActivities_019c8b5b-2815-7c1d-9744-41a06fe2a325" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividends_019c8b5b-2815-7664-b4ae-8441f471e0fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_us-gaap_PaymentsOfDividends_019c8b5b-2815-7664-b4ae-8441f471e0fd" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019c8b5b-2815-7b9b-8d84-da64be7659cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019c8b5b-2815-7b9b-8d84-da64be7659cb" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_019c8b5b-2815-7029-be6e-25951ff158b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_019c8b5b-2815-7029-be6e-25951ff158b4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019c8b5b-2815-76e6-8f79-0659b19a9d59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c8b5b-2815-7191-afb1-9a616ff3b74c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019c8b5b-2815-76e6-8f79-0659b19a9d59" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c8b5b-2815-79b6-bb93-e6ce222e0995" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7260-adf9-c2d7f4e72b14" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c8b5b-2815-79b6-bb93-e6ce222e0995" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019c8b5b-2815-7369-966b-a9242c295683" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7260-adf9-c2d7f4e72b14" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019c8b5b-2815-7369-966b-a9242c295683" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c8b5b-2815-7ea4-ab38-787b3181b0e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7260-adf9-c2d7f4e72b14" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c8b5b-2815-7ea4-ab38-787b3181b0e2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_019c8b5b-2815-7d11-8d0a-9583b10324bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7260-adf9-c2d7f4e72b14" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_019c8b5b-2815-7d11-8d0a-9583b10324bb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_019c8b5b-2815-79f3-94b9-a8476e212125" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations_019c8b5b-2815-7c50-ae8c-8bf2e7c46823" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7260-adf9-c2d7f4e72b14" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations_019c8b5b-2815-7c50-ae8c-8bf2e7c46823" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations_019c8b5b-2815-776d-9fd6-134d75bf0edf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_019c8b5b-2815-7d9b-994c-fbac24b3ba8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7260-adf9-c2d7f4e72b14" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_019c8b5b-2815-7d9b-994c-fbac24b3ba8c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations_019c8b5b-2815-7862-b495-19a67b1d41ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7260-adf9-c2d7f4e72b14" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations_019c8b5b-2815-7862-b495-19a67b1d41ae" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c8b5b-2815-71f4-80e3-4711ae24763b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/ConsolidatedStatementsofStockholdersEquity" xlink:type="simple" xlink:href="lkq-20260331.xsd#ConsolidatedStatementsofStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/ConsolidatedStatementsofStockholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c8b5b-2815-7c1a-990f-10c8f2f7806e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_StatementTable_019c8b5b-2815-7c1a-990f-10c8f2f7806e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c8b5b-2815-79c2-9c8b-800bc0d916b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c8b5b-2815-7c1a-990f-10c8f2f7806e" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c8b5b-2815-79c2-9c8b-800bc0d916b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c8b5b-2815-79c2-9c8b-800bc0d916b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c8b5b-2815-79c2-9c8b-800bc0d916b6" xlink:to="loc_us-gaap_EquityComponentDomain_019c8b5b-2815-79c2-9c8b-800bc0d916b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c8b5b-2815-7c0e-b06a-3d1dd069fb6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c8b5b-2815-79c2-9c8b-800bc0d916b6" xlink:to="loc_us-gaap_EquityComponentDomain_019c8b5b-2815-7c0e-b06a-3d1dd069fb6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c8b5b-2815-7ea0-b2e2-26c9ff05260c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-2815-7c0e-b06a-3d1dd069fb6a" xlink:to="loc_us-gaap_CommonStockMember_019c8b5b-2815-7ea0-b2e2-26c9ff05260c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019c8b5b-2815-730b-a537-ca4e9c8ee36c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-2815-7c0e-b06a-3d1dd069fb6a" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019c8b5b-2815-730b-a537-ca4e9c8ee36c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019c8b5b-2815-75e5-b27f-396ad0c6dc6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-2815-7c0e-b06a-3d1dd069fb6a" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019c8b5b-2815-75e5-b27f-396ad0c6dc6c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019c8b5b-2815-711f-be33-0e3bd4fac260" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-2815-7c0e-b06a-3d1dd069fb6a" xlink:to="loc_us-gaap_RetainedEarningsMember_019c8b5b-2815-711f-be33-0e3bd4fac260" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c8b5b-2815-7b44-a3f9-c1fe35015a7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-2815-7c0e-b06a-3d1dd069fb6a" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c8b5b-2815-7b44-a3f9-c1fe35015a7f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019c8b5b-2815-75c3-a4d7-cf8a6305a705" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-2815-7c0e-b06a-3d1dd069fb6a" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019c8b5b-2815-75c3-a4d7-cf8a6305a705" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8b5b-2815-7690-8ed9-09968fbe90fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c8b5b-2815-7690-8ed9-09968fbe90fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_019c8b5b-2815-78f9-ba7b-cb147250a772" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_SharesIssued_019c8b5b-2815-78f9-ba7b-cb147250a772" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c8b5b-2815-714e-bbda-58a0800f1e25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c8b5b-2815-714e-bbda-58a0800f1e25" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019c8b5b-2815-7e92-b028-94e35613037a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_TreasuryStockCommonShares_019c8b5b-2815-7e92-b028-94e35613037a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019c8b5b-2815-7244-8a99-0cacb1c7dc44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_NetIncomeLoss_019c8b5b-2815-7244-8a99-0cacb1c7dc44" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity_019c8b5b-2815-7c2b-a2b6-3b0140ae9d69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity_019c8b5b-2815-7c2b-a2b6-3b0140ae9d69" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c8b5b-2815-78a8-a42d-430756dfbf14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c8b5b-2815-78a8-a42d-430756dfbf14" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019c8b5b-2815-75c4-8657-04853e55ed04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019c8b5b-2815-75c4-8657-04853e55ed04" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019c8b5b-2815-76ca-990e-28ab7a91a480" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019c8b5b-2815-76ca-990e-28ab7a91a480" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_RestrictedStockUnitsVestedSharesNetOfTaxWithholdings_019c8b5b-2815-7b5a-977d-0258d0aaa6aa" xlink:href="lkq-20260331.xsd#lkq_RestrictedStockUnitsVestedSharesNetOfTaxWithholdings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_lkq_RestrictedStockUnitsVestedSharesNetOfTaxWithholdings_019c8b5b-2815-7b5a-977d-0258d0aaa6aa" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_RestrictedStockUnitsVestedValueNetofTaxWithholdings_019c8b5b-2815-76e4-89db-9caac189372c" xlink:href="lkq-20260331.xsd#lkq_RestrictedStockUnitsVestedValueNetofTaxWithholdings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_lkq_RestrictedStockUnitsVestedValueNetofTaxWithholdings_019c8b5b-2815-76e4-89db-9caac189372c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019c8b5b-2815-714f-86b8-346d465bcdfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019c8b5b-2815-714f-86b8-346d465bcdfe" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_019c8b5b-2815-7673-a1e2-a739d657900e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_DividendsCommonStockCash_019c8b5b-2815-7673-a1e2-a739d657900e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_019c8b5b-2815-7982-832d-9191795d9c06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_019c8b5b-2815-7982-832d-9191795d9c06" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_019c8b5b-2815-7149-a3b3-282b91908fa3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_019c8b5b-2815-7149-a3b3-282b91908fa3" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_019c8b5b-2815-7263-854a-52851e7b26b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c8b5b-2815-7316-b15a-8940a97a7574" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_019c8b5b-2815-7263-854a-52851e7b26b3" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_019c8b5b-2815-7c1c-9e1b-147500bb5500" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesIssued"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c8b5b-2815-7366-a893-c5fce450f8bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019c8b5b-2815-7c33-9674-31c83f3f4150" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/RevenueRecognitionTables" xlink:type="simple" xlink:href="lkq-20260331.xsd#RevenueRecognitionTables"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/RevenueRecognitionTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c8b5b-28ce-777b-bfbc-1a1ce4df250b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c8b5b-28ce-7c8e-b64a-6e4f5e60633c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c8b5b-28ce-777b-bfbc-1a1ce4df250b" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c8b5b-28ce-7c8e-b64a-6e4f5e60633c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28ce-7182-9ecb-69231ae3760e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c8b5b-28ce-7c8e-b64a-6e4f5e60633c" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28ce-7182-9ecb-69231ae3760e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28ce-7182-9ecb-69231ae3760e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28ce-7182-9ecb-69231ae3760e" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28ce-7182-9ecb-69231ae3760e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28ce-73ff-bd21-4672a0081af1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28ce-7182-9ecb-69231ae3760e" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28ce-73ff-bd21-4672a0081af1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c8b5b-28ce-775e-ac1f-6aed22cb934f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c8b5b-28ce-7c8e-b64a-6e4f5e60633c" xlink:to="loc_srt_ProductOrServiceAxis_019c8b5b-28ce-775e-ac1f-6aed22cb934f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c8b5b-28ce-775e-ac1f-6aed22cb934f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c8b5b-28ce-775e-ac1f-6aed22cb934f" xlink:to="loc_srt_ProductsAndServicesDomain_019c8b5b-28ce-775e-ac1f-6aed22cb934f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c8b5b-28ce-7fbc-b806-a1e30f69f22b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c8b5b-28ce-775e-ac1f-6aed22cb934f" xlink:to="loc_srt_ProductsAndServicesDomain_019c8b5b-28ce-7fbc-b806-a1e30f69f22b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_019c8b5b-28ce-7070-87c7-6e971483c8ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c8b5b-28ce-777b-bfbc-1a1ce4df250b" xlink:to="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_019c8b5b-28ce-7070-87c7-6e971483c8ac" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/AccumulatedOtherComprehensiveIncomeLossTables" xlink:type="simple" xlink:href="lkq-20260331.xsd#AccumulatedOtherComprehensiveIncomeLossTables"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/AccumulatedOtherComprehensiveIncomeLossTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_lkq_CashFlowHedgesReclassifiedtoInterestExpenseLineItems_019c8b5b-28cf-7d88-b31a-23deb3c73ec3" xlink:href="lkq-20260331.xsd#lkq_CashFlowHedgesReclassifiedtoInterestExpenseLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_CashFlowHedgesReclassifiedtoInterestExpenseTable_019c8b5b-28cf-7048-a5cc-8048ec3a338e" xlink:href="lkq-20260331.xsd#lkq_CashFlowHedgesReclassifiedtoInterestExpenseTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lkq_CashFlowHedgesReclassifiedtoInterestExpenseLineItems_019c8b5b-28cf-7d88-b31a-23deb3c73ec3" xlink:to="loc_lkq_CashFlowHedgesReclassifiedtoInterestExpenseTable_019c8b5b-28cf-7048-a5cc-8048ec3a338e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7e28-a65d-87798fcc0949" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_CashFlowHedgesReclassifiedtoInterestExpenseTable_019c8b5b-28cf-7048-a5cc-8048ec3a338e" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7e28-a65d-87798fcc0949" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7e28-a65d-87798fcc0949_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7e28-a65d-87798fcc0949" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7e28-a65d-87798fcc0949_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-798f-9c53-9169a553894f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7e28-a65d-87798fcc0949" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-798f-9c53-9169a553894f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/FairValueMeasurementsTables" xlink:type="simple" xlink:href="lkq-20260331.xsd#FairValueMeasurementsTables"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/FairValueMeasurementsTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c8b5b-28cf-7683-b781-5609426b4b4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisTable_019c8b5b-28cf-74b4-99b7-feb542f8e781" xlink:href="lkq-20260331.xsd#lkq_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c8b5b-28cf-7683-b781-5609426b4b4c" xlink:to="loc_lkq_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisTable_019c8b5b-28cf-74b4-99b7-feb542f8e781" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-755e-ba84-3b9897b7491f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisTable_019c8b5b-28cf-74b4-99b7-feb542f8e781" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-755e-ba84-3b9897b7491f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-755e-ba84-3b9897b7491f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-755e-ba84-3b9897b7491f" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-755e-ba84-3b9897b7491f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-7afc-98c8-37a2710217dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-755e-ba84-3b9897b7491f" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-7afc-98c8-37a2710217dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8b5b-28cf-7f03-897b-645dcc42b102" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisTable_019c8b5b-28cf-74b4-99b7-feb542f8e781" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8b5b-28cf-7f03-897b-645dcc42b102" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7f03-897b-645dcc42b102_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8b5b-28cf-7f03-897b-645dcc42b102" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7f03-897b-645dcc42b102_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7538-a83b-1f3e4401bae6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8b5b-28cf-7f03-897b-645dcc42b102" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7538-a83b-1f3e4401bae6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_019c8b5b-28cf-7989-8a29-94de2a2f5e21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c8b5b-28cf-7683-b781-5609426b4b4c" xlink:to="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_019c8b5b-28cf-7989-8a29-94de2a2f5e21" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTableTextBlock_019c8b5b-28cf-75d3-af9c-f459b5197a76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c8b5b-28cf-7683-b781-5609426b4b4c" xlink:to="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTableTextBlock_019c8b5b-28cf-75d3-af9c-f459b5197a76" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/IncomeStatementbyDiscontinuedOperationsandDisposalGroupsDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#IncomeStatementbyDiscontinuedOperationsandDisposalGroupsDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/IncomeStatementbyDiscontinuedOperationsandDisposalGroupsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019c8b5b-2815-7268-8a23-1fb98e0bf9b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019c8b5b-2815-7268-8a23-1fb98e0bf9b8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019c8b5b-2815-7dd8-94e9-c6aec1cb891c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019c8b5b-2815-7268-8a23-1fb98e0bf9b8" xlink:to="loc_us-gaap_CreditFacilityAxis_019c8b5b-2815-7dd8-94e9-c6aec1cb891c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c8b5b-2815-7dd8-94e9-c6aec1cb891c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019c8b5b-2815-7dd8-94e9-c6aec1cb891c" xlink:to="loc_us-gaap_CreditFacilityDomain_019c8b5b-2815-7dd8-94e9-c6aec1cb891c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c8b5b-2815-73dd-abc1-06a681c34f72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019c8b5b-2815-7dd8-94e9-c6aec1cb891c" xlink:to="loc_us-gaap_CreditFacilityDomain_019c8b5b-2815-73dd-abc1-06a681c34f72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c8b5b-2815-7027-bc21-bf7e9deccc59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019c8b5b-2815-73dd-abc1-06a681c34f72" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c8b5b-2815-7027-bc21-bf7e9deccc59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-2815-74a7-9269-a7b3f8e9d893" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019c8b5b-2815-7268-8a23-1fb98e0bf9b8" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-2815-74a7-9269-a7b3f8e9d893" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-2815-74a7-9269-a7b3f8e9d893_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-2815-74a7-9269-a7b3f8e9d893" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-2815-74a7-9269-a7b3f8e9d893_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-2815-761d-874b-46813160ad72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-2815-74a7-9269-a7b3f8e9d893" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-2815-761d-874b-46813160ad72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember_019c8b5b-2815-724f-97ba-744a9b53e173" xlink:href="lkq-20260331.xsd#lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-2815-761d-874b-46813160ad72" xlink:to="loc_lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember_019c8b5b-2815-724f-97ba-744a9b53e173" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_019c8b5b-2815-7ea7-9045-e420f4471f32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_019c8b5b-2815-7ea7-9045-e420f4471f32" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_019c8b5b-2815-7cad-adba-8ee705bafc1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_019c8b5b-2815-7cad-adba-8ee705bafc1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss_019c8b5b-2815-7271-bb48-5d5561f46909" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss_019c8b5b-2815-7271-bb48-5d5561f46909" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_019ddf09-18b0-7840-b5f0-0427aefdaf02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_019ddf09-18b0-7840-b5f0-0427aefdaf02" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_019c8b5b-2815-752c-b265-c9dda18edf80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_019c8b5b-2815-752c-b265-c9dda18edf80" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_019c8b5b-2815-74b0-a586-579b117ede2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_019c8b5b-2815-74b0-a586-579b117ede2d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization_019c8b5b-2815-73d9-9320-b7331af61dca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization_019c8b5b-2815-73d9-9320-b7331af61dca" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_019c8b5b-2815-70e4-bac3-f91a053a8fa4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_019c8b5b-2815-70e4-bac3-f91a053a8fa4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense_019c8b5b-2815-77c9-8a30-a2901a222e51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense_019c8b5b-2815-77c9-8a30-a2901a222e51" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome_019c8b5b-2815-71e1-84f4-1bd5d1c79bd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome_019c8b5b-2815-71e1-84f4-1bd5d1c79bd1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense_019c8b5b-2815-7271-bd61-d2899a3d8486" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense_019c8b5b-2815-7271-bd61-d2899a3d8486" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_019c8b5b-2815-71c9-91ed-7263cd290514" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_019c8b5b-2815-71c9-91ed-7263cd290514" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_019c8b5b-2815-76f6-bed1-3bc5e1862ded" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_019c8b5b-2815-76f6-bed1-3bc5e1862ded" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_019c8b5b-2815-78a2-9cb2-237fcfb2391e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7095-8af3-8ce8b3c52891" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_019c8b5b-2815-78a2-9cb2-237fcfb2391e" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/BalanceSheetbyDiscontinuedOperationsandDisposalGroupsDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#BalanceSheetbyDiscontinuedOperationsandDisposalGroupsDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/BalanceSheetbyDiscontinuedOperationsandDisposalGroupsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7d3d-bca1-57fdbb8dade0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019c8b5b-2815-715a-9a0e-168ef5ecc6f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7d3d-bca1-57fdbb8dade0" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019c8b5b-2815-715a-9a0e-168ef5ecc6f0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019c8b5b-2815-77a2-87e2-d29e2f946990" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019c8b5b-2815-715a-9a0e-168ef5ecc6f0" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019c8b5b-2815-77a2-87e2-d29e2f946990" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c8b5b-2815-77a2-87e2-d29e2f946990_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019c8b5b-2815-77a2-87e2-d29e2f946990" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c8b5b-2815-77a2-87e2-d29e2f946990_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c8b5b-2815-7a51-a9af-7fdb07a676cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019c8b5b-2815-77a2-87e2-d29e2f946990" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c8b5b-2815-7a51-a9af-7fdb07a676cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019c8b5b-2815-709c-b0c9-9b34edf536a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019c8b5b-2815-715a-9a0e-168ef5ecc6f0" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019c8b5b-2815-709c-b0c9-9b34edf536a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019c8b5b-2815-709c-b0c9-9b34edf536a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019c8b5b-2815-709c-b0c9-9b34edf536a1" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019c8b5b-2815-709c-b0c9-9b34edf536a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019c8b5b-2815-75cd-a0c1-2822f87dd392" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019c8b5b-2815-709c-b0c9-9b34edf536a1" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019c8b5b-2815-75cd-a0c1-2822f87dd392" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-2815-7ca3-a64f-5d0292c19135" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019c8b5b-2815-715a-9a0e-168ef5ecc6f0" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-2815-7ca3-a64f-5d0292c19135" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-2815-7ca3-a64f-5d0292c19135_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-2815-7ca3-a64f-5d0292c19135" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-2815-7ca3-a64f-5d0292c19135_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-2815-7d03-bdb5-bc6886a0f877" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-2815-7ca3-a64f-5d0292c19135" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-2815-7d03-bdb5-bc6886a0f877" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_019c8b5b-2815-704b-9f69-b5f764196b30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7d3d-bca1-57fdbb8dade0" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_019c8b5b-2815-704b-9f69-b5f764196b30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_019c8b5b-28ce-7acb-8115-8e00374bbcb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7d3d-bca1-57fdbb8dade0" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_019c8b5b-28ce-7acb-8115-8e00374bbcb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_019c8b5b-28ce-7f32-9489-d1d9409bc8c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7d3d-bca1-57fdbb8dade0" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_019c8b5b-28ce-7f32-9489-d1d9409bc8c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_019c8b5b-28ce-7919-9bc4-bb6cefa78539" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019c8b5b-2815-7d3d-bca1-57fdbb8dade0" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_019c8b5b-28ce-7919-9bc4-bb6cefa78539" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/AdditionalDetailsDiscontinuedOperationsandDisposalGroupsDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#AdditionalDetailsDiscontinuedOperationsandDisposalGroupsDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/AdditionalDetailsDiscontinuedOperationsandDisposalGroupsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsLineItems_019c8b5b-28ce-741a-8678-680f366e67ee" xlink:href="lkq-20260331.xsd#lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsTable_019c8b5b-28ce-788d-b07b-94cbb11d881e" xlink:href="lkq-20260331.xsd#lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsLineItems_019c8b5b-28ce-741a-8678-680f366e67ee" xlink:to="loc_lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsTable_019c8b5b-28ce-788d-b07b-94cbb11d881e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019ddf61-1eb0-7e84-a3bc-d882651c4889" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsTable_019c8b5b-28ce-788d-b07b-94cbb11d881e" xlink:to="loc_us-gaap_CreditFacilityAxis_019ddf61-1eb0-7e84-a3bc-d882651c4889" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019ddf61-1eb0-7e84-a3bc-d882651c4889_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019ddf61-1eb0-7e84-a3bc-d882651c4889" xlink:to="loc_us-gaap_CreditFacilityDomain_019ddf61-1eb0-7e84-a3bc-d882651c4889_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019ddf61-1eb0-734f-91dd-4f10c115464d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019ddf61-1eb0-7e84-a3bc-d882651c4889" xlink:to="loc_us-gaap_CreditFacilityDomain_019ddf61-1eb0-734f-91dd-4f10c115464d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019ddf61-43dc-7257-9cd4-ae125d865c02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019ddf61-1eb0-734f-91dd-4f10c115464d" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019ddf61-43dc-7257-9cd4-ae125d865c02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019ddf61-4f56-7f76-bfe1-d94d221099f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsTable_019c8b5b-28ce-788d-b07b-94cbb11d881e" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019ddf61-4f56-7f76-bfe1-d94d221099f0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019ddf61-4f56-7f76-bfe1-d94d221099f0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019ddf61-4f56-7f76-bfe1-d94d221099f0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019ddf61-4f56-7f76-bfe1-d94d221099f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019ddf61-4f56-7072-bd55-bd3ef1d6140f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019ddf61-4f56-7f76-bfe1-d94d221099f0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019ddf61-4f56-7072-bd55-bd3ef1d6140f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember_019ddf61-646d-7b63-bf3f-f473a0511ee3" xlink:href="lkq-20260331.xsd#lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019ddf61-4f56-7072-bd55-bd3ef1d6140f" xlink:to="loc_lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember_019ddf61-646d-7b63-bf3f-f473a0511ee3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization_019c8b5b-28ce-7e82-9da4-462c46a7a2e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsLineItems_019c8b5b-28ce-741a-8678-680f366e67ee" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization_019c8b5b-28ce-7e82-9da4-462c46a7a2e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_019c8b5b-28ce-7ab4-8e3d-4fe8fbd799a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsLineItems_019c8b5b-28ce-741a-8678-680f366e67ee" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_019c8b5b-28ce-7ab4-8e3d-4fe8fbd799a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_DisposalGroupIncludingDiscontinuedOperationPaymentsToAcquireProductiveAssets_019c8b5b-28ce-7bcd-847d-175495c18634" xlink:href="lkq-20260331.xsd#lkq_DisposalGroupIncludingDiscontinuedOperationPaymentsToAcquireProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsLineItems_019c8b5b-28ce-741a-8678-680f366e67ee" xlink:to="loc_lkq_DisposalGroupIncludingDiscontinuedOperationPaymentsToAcquireProductiveAssets_019c8b5b-28ce-7bcd-847d-175495c18634" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_019ddf0f-031d-7599-a86e-39f6f5b55537" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsLineItems_019c8b5b-28ce-741a-8678-680f366e67ee" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_019ddf0f-031d-7599-a86e-39f6f5b55537" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_019ddf0f-20a6-7696-96bc-0386db57c2bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_AdditionalDetailsByDiscontinuedOperationsAndDisposalGroupsLineItems_019c8b5b-28ce-741a-8678-680f366e67ee" xlink:to="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_019ddf0f-20a6-7696-96bc-0386db57c2bc" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/IntangibleAssetsDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#IntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/IntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_019ddece-d1b1-7376-91bd-abdf9630a091" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_019ddece-d1b1-7a8f-a874-7d8eea578fdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_019ddece-d1b1-7376-91bd-abdf9630a091" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_019ddece-d1b1-7a8f-a874-7d8eea578fdf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019ddece-d1b1-756e-88d0-f4b486edd743" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_019ddece-d1b1-7a8f-a874-7d8eea578fdf" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019ddece-d1b1-756e-88d0-f4b486edd743" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019ddece-d1b1-756e-88d0-f4b486edd743_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019ddece-d1b1-756e-88d0-f4b486edd743" xlink:to="loc_us-gaap_SegmentDomain_019ddece-d1b1-756e-88d0-f4b486edd743_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019ddece-d1b1-7fca-8309-6a10d81fcb7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019ddece-d1b1-756e-88d0-f4b486edd743" xlink:to="loc_us-gaap_SegmentDomain_019ddece-d1b1-7fca-8309-6a10d81fcb7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SpecialtyMember_019ddecf-0c4e-7d8a-aaca-ebeb4b55d3a8" xlink:href="lkq-20260331.xsd#lkq_SpecialtyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019ddece-d1b1-7fca-8309-6a10d81fcb7f" xlink:to="loc_lkq_SpecialtyMember_019ddecf-0c4e-7d8a-aaca-ebeb4b55d3a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitAxis_019ddf5c-afeb-78d9-91ea-8de07769e269" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReportingUnitAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_019ddece-d1b1-7a8f-a874-7d8eea578fdf" xlink:to="loc_us-gaap_ReportingUnitAxis_019ddf5c-afeb-78d9-91ea-8de07769e269" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitDomain_019ddf5c-afeb-78d9-91ea-8de07769e269_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReportingUnitDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReportingUnitAxis_019ddf5c-afeb-78d9-91ea-8de07769e269" xlink:to="loc_us-gaap_ReportingUnitDomain_019ddf5c-afeb-78d9-91ea-8de07769e269_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitDomain_019ddf5c-afeb-71d1-b457-13858bd158d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReportingUnitDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReportingUnitAxis_019ddf5c-afeb-78d9-91ea-8de07769e269" xlink:to="loc_us-gaap_ReportingUnitDomain_019ddf5c-afeb-71d1-b457-13858bd158d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_019ddece-d1b1-7b92-abc8-44cbebcc7a15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019ddece-d1b1-7376-91bd-abdf9630a091" xlink:to="loc_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_019ddece-d1b1-7b92-abc8-44cbebcc7a15" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/EquityMethodInvestmentsDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#EquityMethodInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/EquityMethodInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019dda16-4516-786b-9ac7-74d155d3118a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019dda16-4516-76ff-8235-2d46f9d87e90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019dda16-4516-786b-9ac7-74d155d3118a" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019dda16-4516-76ff-8235-2d46f9d87e90" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019dda17-91cc-71ae-9b15-ba7675ed0fd6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019dda16-4516-76ff-8235-2d46f9d87e90" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019dda17-91cc-71ae-9b15-ba7675ed0fd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019dda17-91cc-71ae-9b15-ba7675ed0fd6_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019dda17-91cc-71ae-9b15-ba7675ed0fd6" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019dda17-91cc-71ae-9b15-ba7675ed0fd6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019dda17-91cc-74e2-82ae-b09f6d2decff" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019dda17-91cc-71ae-9b15-ba7675ed0fd6" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019dda17-91cc-74e2-82ae-b09f6d2decff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_MekonomenMember_019dda1a-7393-7d19-876b-18e96feba94e" xlink:href="lkq-20260331.xsd#lkq_MekonomenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019dda17-91cc-74e2-82ae-b09f6d2decff" xlink:to="loc_lkq_MekonomenMember_019dda1a-7393-7d19-876b-18e96feba94e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_OtherMember_019dda1f-016e-7307-a425-014f13c683eb" xlink:href="lkq-20260331.xsd#lkq_OtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019dda17-91cc-74e2-82ae-b09f6d2decff" xlink:to="loc_lkq_OtherMember_019dda1f-016e-7307-a425-014f13c683eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019dda16-a31d-73f9-ba71-e6c835a04492" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019dda16-4516-786b-9ac7-74d155d3118a" xlink:to="loc_us-gaap_EquityMethodInvestments_019dda16-a31d-73f9-ba71-e6c835a04492" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_019dda16-4516-7bd3-8dd0-03f6404db075" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019dda16-4516-786b-9ac7-74d155d3118a" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_019dda16-4516-7bd3-8dd0-03f6404db075" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_019dda17-03d0-75c9-82de-b7e1a8081be5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019dda16-4516-786b-9ac7-74d155d3118a" xlink:to="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_019dda17-03d0-75c9-82de-b7e1a8081be5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_019dda17-1f56-7e99-89c2-00de41267b51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019dda16-4516-786b-9ac7-74d155d3118a" xlink:to="loc_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_019dda17-1f56-7e99-89c2-00de41267b51" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_019dda17-47c6-7474-9fe1-8ecc72c9756c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019dda16-4516-786b-9ac7-74d155d3118a" xlink:to="loc_us-gaap_SharePrice_019dda17-47c6-7474-9fe1-8ecc72c9756c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SharePriceOfTheEquityMethodInvestment_019dda23-518c-7c14-80ca-fa65927987e7" xlink:href="lkq-20260331.xsd#lkq_SharePriceOfTheEquityMethodInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019dda16-4516-786b-9ac7-74d155d3118a" xlink:to="loc_lkq_SharePriceOfTheEquityMethodInvestment_019dda23-518c-7c14-80ca-fa65927987e7" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/RevenueRecognitionDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#RevenueRecognitionDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/RevenueRecognitionDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019c8b5b-28ce-7d88-805f-0f3b7d3043d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c8b5b-28ce-70ca-ae79-6d97fa096761" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c8b5b-28ce-7d88-805f-0f3b7d3043d4" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c8b5b-28ce-70ca-ae79-6d97fa096761" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c8b5b-28ce-788c-b1e6-47a8a727a12c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c8b5b-28ce-70ca-ae79-6d97fa096761" xlink:to="loc_srt_ProductOrServiceAxis_019c8b5b-28ce-788c-b1e6-47a8a727a12c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c8b5b-28ce-788c-b1e6-47a8a727a12c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c8b5b-28ce-788c-b1e6-47a8a727a12c" xlink:to="loc_srt_ProductsAndServicesDomain_019c8b5b-28ce-788c-b1e6-47a8a727a12c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c8b5b-28ce-7c26-bc11-5bc9484a5b8e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c8b5b-28ce-788c-b1e6-47a8a727a12c" xlink:to="loc_srt_ProductsAndServicesDomain_019c8b5b-28ce-7c26-bc11-5bc9484a5b8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_PartsandServicesDomain_019c8b5b-28ce-79b8-b88e-bdb3f61c6b2f" xlink:href="lkq-20260331.xsd#lkq_PartsandServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c8b5b-28ce-7c26-bc11-5bc9484a5b8e" xlink:to="loc_lkq_PartsandServicesDomain_019c8b5b-28ce-79b8-b88e-bdb3f61c6b2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_OtherRevenueMember_019c8b5b-28ce-75b8-815a-4ebd810b09ba" xlink:href="lkq-20260331.xsd#lkq_OtherRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c8b5b-28ce-7c26-bc11-5bc9484a5b8e" xlink:to="loc_lkq_OtherRevenueMember_019c8b5b-28ce-75b8-815a-4ebd810b09ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28ce-72a3-82f4-275c1f1f68b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c8b5b-28ce-70ca-ae79-6d97fa096761" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28ce-72a3-82f4-275c1f1f68b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28ce-72a3-82f4-275c1f1f68b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28ce-72a3-82f4-275c1f1f68b6" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28ce-72a3-82f4-275c1f1f68b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28ce-7faf-8dc2-f800b95c11ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28ce-72a3-82f4-275c1f1f68b6" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28ce-7faf-8dc2-f800b95c11ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_NorthAmericaSegmentMember_019ddee0-2fd0-7c7c-b4bf-649e527d8e50" xlink:href="lkq-20260331.xsd#lkq_NorthAmericaSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28ce-7faf-8dc2-f800b95c11ad" xlink:to="loc_lkq_NorthAmericaSegmentMember_019ddee0-2fd0-7c7c-b4bf-649e527d8e50" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuropeSegmentMember_019c8b5b-28ce-71ee-8cd0-2e8bc026c0b7" xlink:href="lkq-20260331.xsd#lkq_EuropeSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28ce-7faf-8dc2-f800b95c11ad" xlink:to="loc_lkq_EuropeSegmentMember_019c8b5b-28ce-71ee-8cd0-2e8bc026c0b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SpecialtyMember_019c8b5b-28ce-7bc9-a282-54092e2d521c" xlink:href="lkq-20260331.xsd#lkq_SpecialtyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28ce-7faf-8dc2-f800b95c11ad" xlink:to="loc_lkq_SpecialtyMember_019c8b5b-28ce-7bc9-a282-54092e2d521c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SelfServiceSegmentMember_019c8b5b-28ce-7d37-847c-27a7c98281b5" xlink:href="lkq-20260331.xsd#lkq_SelfServiceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28ce-7faf-8dc2-f800b95c11ad" xlink:to="loc_lkq_SelfServiceSegmentMember_019c8b5b-28ce-7d37-847c-27a7c98281b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_OtherRevenueAxis_019c8b5b-28ce-7f12-ba00-930d5fd7a6c4" xlink:href="lkq-20260331.xsd#lkq_OtherRevenueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c8b5b-28ce-70ca-ae79-6d97fa096761" xlink:to="loc_lkq_OtherRevenueAxis_019c8b5b-28ce-7f12-ba00-930d5fd7a6c4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_PartsandServicesDomain_019c8b5b-28ce-7f12-ba00-930d5fd7a6c4_default" xlink:href="lkq-20260331.xsd#lkq_PartsandServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lkq_OtherRevenueAxis_019c8b5b-28ce-7f12-ba00-930d5fd7a6c4" xlink:to="loc_lkq_PartsandServicesDomain_019c8b5b-28ce-7f12-ba00-930d5fd7a6c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_PartsandServicesDomain_019c8b5b-28ce-7fcf-8bde-25f990892e81" xlink:href="lkq-20260331.xsd#lkq_PartsandServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lkq_OtherRevenueAxis_019c8b5b-28ce-7f12-ba00-930d5fd7a6c4" xlink:to="loc_lkq_PartsandServicesDomain_019c8b5b-28ce-7fcf-8bde-25f990892e81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_OtherRevenueDomain_019c8b5b-28ce-7a8f-8491-8b3b2a64fa5f" xlink:href="lkq-20260331.xsd#lkq_OtherRevenueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lkq_OtherRevenueAxis_019c8b5b-28ce-7f12-ba00-930d5fd7a6c4" xlink:to="loc_lkq_OtherRevenueDomain_019c8b5b-28ce-7a8f-8491-8b3b2a64fa5f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_OtherRevenueMember_019c8b5b-28ce-7286-b090-88b39da80c62" xlink:href="lkq-20260331.xsd#lkq_OtherRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_OtherRevenueDomain_019c8b5b-28ce-7a8f-8491-8b3b2a64fa5f" xlink:to="loc_lkq_OtherRevenueMember_019c8b5b-28ce-7286-b090-88b39da80c62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c8b5b-28ce-7286-a202-8bb92d64bb5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c8b5b-28ce-7d88-805f-0f3b7d3043d4" xlink:to="loc_us-gaap_Revenues_019c8b5b-28ce-7286-a202-8bb92d64bb5d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c8b5b-28ce-7145-b99f-14341bd9a535" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c8b5b-28ce-75f3-8faa-130407154bfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c8b5b-28ce-7145-b99f-14341bd9a535" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c8b5b-28ce-75f3-8faa-130407154bfa" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c8b5b-28ce-7e1f-ad93-f9c24bfec53b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c8b5b-28ce-75f3-8faa-130407154bfa" xlink:to="loc_srt_RangeAxis_019c8b5b-28ce-7e1f-ad93-f9c24bfec53b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c8b5b-28ce-7e1f-ad93-f9c24bfec53b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c8b5b-28ce-7e1f-ad93-f9c24bfec53b" xlink:to="loc_srt_RangeMember_019c8b5b-28ce-7e1f-ad93-f9c24bfec53b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c8b5b-28ce-795b-af8c-4bb93954824d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c8b5b-28ce-7e1f-ad93-f9c24bfec53b" xlink:to="loc_srt_RangeMember_019c8b5b-28ce-795b-af8c-4bb93954824d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c8b5b-28ce-7bff-90b2-5bc827c436da" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c8b5b-28ce-795b-af8c-4bb93954824d" xlink:to="loc_srt_MinimumMember_019c8b5b-28ce-7bff-90b2-5bc827c436da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c8b5b-28ce-7057-82bd-5e52d2bb4e42" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c8b5b-28ce-795b-af8c-4bb93954824d" xlink:to="loc_srt_MaximumMember_019c8b5b-28ce-7057-82bd-5e52d2bb4e42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019c8b5b-28ce-7da4-8522-e14f5796cf6c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c8b5b-28ce-75f3-8faa-130407154bfa" xlink:to="loc_srt_MajorCustomersAxis_019c8b5b-28ce-7da4-8522-e14f5796cf6c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019c8b5b-28ce-7da4-8522-e14f5796cf6c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019c8b5b-28ce-7da4-8522-e14f5796cf6c" xlink:to="loc_srt_NameOfMajorCustomerDomain_019c8b5b-28ce-7da4-8522-e14f5796cf6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019c8b5b-28ce-7238-984d-3c8a354066d3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019c8b5b-28ce-7da4-8522-e14f5796cf6c" xlink:to="loc_srt_NameOfMajorCustomerDomain_019c8b5b-28ce-7238-984d-3c8a354066d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ThirdPartyMember_019c8b5b-28ce-7dd1-9320-ae4bcb7d03a1" xlink:href="lkq-20260331.xsd#lkq_ThirdPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019c8b5b-28ce-7238-984d-3c8a354066d3" xlink:to="loc_lkq_ThirdPartyMember_019c8b5b-28ce-7dd1-9320-ae4bcb7d03a1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/RevenuefromExternalCustomersbyGeographicAreasDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#RevenuefromExternalCustomersbyGeographicAreasDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/RevenuefromExternalCustomersbyGeographicAreasDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019c8b5b-28cf-762a-bd59-8d01b2a11d8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_019c8b5b-28cf-7ff4-aede-ea9246992f74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019c8b5b-28cf-762a-bd59-8d01b2a11d8c" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_019c8b5b-28cf-7ff4-aede-ea9246992f74" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c8b5b-28cf-7817-a30b-ae44bd2cd5ce" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_019c8b5b-28cf-7ff4-aede-ea9246992f74" xlink:to="loc_srt_StatementGeographicalAxis_019c8b5b-28cf-7817-a30b-ae44bd2cd5ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-7817-a30b-ae44bd2cd5ce_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c8b5b-28cf-7817-a30b-ae44bd2cd5ce" xlink:to="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-7817-a30b-ae44bd2cd5ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-713c-afb8-da25f8ad04a5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c8b5b-28cf-7817-a30b-ae44bd2cd5ce" xlink:to="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-713c-afb8-da25f8ad04a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019c8b5b-28cf-7e53-8ea1-111cc6c92818" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-713c-afb8-da25f8ad04a5" xlink:to="loc_country_US_019c8b5b-28cf-7e53-8ea1-111cc6c92818" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_DE_019c8b5b-28cf-7a69-ad51-ea534904ef94" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_DE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-713c-afb8-da25f8ad04a5" xlink:to="loc_country_DE_019c8b5b-28cf-7a69-ad51-ea534904ef94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_019c8b5b-28cf-779e-b234-ec8a7273b77c" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-713c-afb8-da25f8ad04a5" xlink:to="loc_country_GB_019c8b5b-28cf-779e-b234-ec8a7273b77c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_OtherCountriesMember_019c8b5b-28cf-76c6-a5f1-05b9b0c89143" xlink:href="lkq-20260331.xsd#lkq_OtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-713c-afb8-da25f8ad04a5" xlink:to="loc_lkq_OtherCountriesMember_019c8b5b-28cf-76c6-a5f1-05b9b0c89143" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c8b5b-28cf-7efd-ab9c-b34616539d71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019c8b5b-28cf-762a-bd59-8d01b2a11d8c" xlink:to="loc_us-gaap_Revenues_019c8b5b-28cf-7efd-ab9c-b34616539d71" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/RestructuringandTransactionRelatedExpensesDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#RestructuringandTransactionRelatedExpensesDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/RestructuringandTransactionRelatedExpensesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019c8b5b-28cf-7236-9de8-0a336d3774a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c8b5b-28cf-79db-bab6-41ecf3336511" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c8b5b-28cf-7236-9de8-0a336d3774a7" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c8b5b-28cf-79db-bab6-41ecf3336511" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-7db9-9c10-0461b90508d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c8b5b-28cf-79db-bab6-41ecf3336511" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-7db9-9c10-0461b90508d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7db9-9c10-0461b90508d1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-7db9-9c10-0461b90508d1" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7db9-9c10-0461b90508d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28cf-787c-ae3d-04db5f596fe8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-7db9-9c10-0461b90508d1" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28cf-787c-ae3d-04db5f596fe8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_WholesaleNorthAmericaSegmentMember_019c8b5b-28cf-7853-b461-a91b5d6521af" xlink:href="lkq-20260331.xsd#lkq_WholesaleNorthAmericaSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-787c-ae3d-04db5f596fe8" xlink:to="loc_lkq_WholesaleNorthAmericaSegmentMember_019c8b5b-28cf-7853-b461-a91b5d6521af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuropeSegmentMember_019c8b5b-28cf-7c7e-8f35-deb7b48c13d3" xlink:href="lkq-20260331.xsd#lkq_EuropeSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-787c-ae3d-04db5f596fe8" xlink:to="loc_lkq_EuropeSegmentMember_019c8b5b-28cf-7c7e-8f35-deb7b48c13d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SpecialtyMember_019c8b5b-28cf-7c7b-83da-014cdd6f4e4f" xlink:href="lkq-20260331.xsd#lkq_SpecialtyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-787c-ae3d-04db5f596fe8" xlink:to="loc_lkq_SpecialtyMember_019c8b5b-28cf-7c7b-83da-014cdd6f4e4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SelfServiceSegmentMember_019c8b5b-28cf-71b6-86eb-350d53b7ea1b" xlink:href="lkq-20260331.xsd#lkq_SelfServiceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-787c-ae3d-04db5f596fe8" xlink:to="loc_lkq_SelfServiceSegmentMember_019c8b5b-28cf-71b6-86eb-350d53b7ea1b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-7214-b818-2595130666df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c8b5b-28cf-79db-bab6-41ecf3336511" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-7214-b818-2595130666df" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-7214-b818-2595130666df_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-7214-b818-2595130666df" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-7214-b818-2595130666df_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-7207-b400-b26fa20adae0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-7214-b818-2595130666df" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-7207-b400-b26fa20adae0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019c8b5b-28cf-77d2-8336-cc729d929f94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c8b5b-28cf-79db-bab6-41ecf3336511" xlink:to="loc_us-gaap_RestructuringPlanAxis_019c8b5b-28cf-77d2-8336-cc729d929f94" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019c8b5b-28cf-77d2-8336-cc729d929f94_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019c8b5b-28cf-77d2-8336-cc729d929f94" xlink:to="loc_us-gaap_RestructuringPlanDomain_019c8b5b-28cf-77d2-8336-cc729d929f94_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019c8b5b-28cf-7519-a73a-96161061cd51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019c8b5b-28cf-77d2-8336-cc729d929f94" xlink:to="loc_us-gaap_RestructuringPlanDomain_019c8b5b-28cf-7519-a73a-96161061cd51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_StrategicRestructuringAndTransformationInitiativesMember_019cf761-a959-7096-b2c9-735f99a30382" xlink:href="lkq-20260331.xsd#lkq_StrategicRestructuringAndTransformationInitiativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019c8b5b-28cf-7519-a73a-96161061cd51" xlink:to="loc_lkq_StrategicRestructuringAndTransformationInitiativesMember_019cf761-a959-7096-b2c9-735f99a30382" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_AcquisitionIntegrationPlansMember_019c8b5b-28cf-7409-95cc-b56680ce4555" xlink:href="lkq-20260331.xsd#lkq_AcquisitionIntegrationPlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019c8b5b-28cf-7519-a73a-96161061cd51" xlink:to="loc_lkq_AcquisitionIntegrationPlansMember_019c8b5b-28cf-7409-95cc-b56680ce4555" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c8b5b-28cf-7082-b62c-cb1e0a2984f3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c8b5b-28cf-79db-bab6-41ecf3336511" xlink:to="loc_srt_RangeAxis_019c8b5b-28cf-7082-b62c-cb1e0a2984f3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c8b5b-28cf-7082-b62c-cb1e0a2984f3_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c8b5b-28cf-7082-b62c-cb1e0a2984f3" xlink:to="loc_srt_RangeMember_019c8b5b-28cf-7082-b62c-cb1e0a2984f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c8b5b-28cf-7d1c-a5b5-c5a4155ea450" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c8b5b-28cf-7082-b62c-cb1e0a2984f3" xlink:to="loc_srt_RangeMember_019c8b5b-28cf-7d1c-a5b5-c5a4155ea450" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c8b5b-28cf-761b-a225-85d97836beb9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c8b5b-28cf-7d1c-a5b5-c5a4155ea450" xlink:to="loc_srt_MaximumMember_019c8b5b-28cf-761b-a225-85d97836beb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c8b5b-28cf-7396-81de-8925e667796b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c8b5b-28cf-7d1c-a5b5-c5a4155ea450" xlink:to="loc_srt_MinimumMember_019c8b5b-28cf-7396-81de-8925e667796b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7ded-8cc6-37c76bede1c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c8b5b-28cf-79db-bab6-41ecf3336511" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7ded-8cc6-37c76bede1c5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7ded-8cc6-37c76bede1c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7ded-8cc6-37c76bede1c5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7ded-8cc6-37c76bede1c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7d60-881b-37fc10b2e007" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7ded-8cc6-37c76bede1c5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7d60-881b-37fc10b2e007" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_019c8b5b-28cf-7784-b5dd-34b5b3beceab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c8b5b-28cf-79db-bab6-41ecf3336511" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_019c8b5b-28cf-7784-b5dd-34b5b3beceab" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7784-b5dd-34b5b3beceab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019c8b5b-28cf-7784-b5dd-34b5b3beceab" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7784-b5dd-34b5b3beceab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7b8b-94c2-3840e55c0632" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019c8b5b-28cf-7784-b5dd-34b5b3beceab" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7b8b-94c2-3840e55c0632" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_019c8b5b-28cf-7e41-ac29-8300bdfa57f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c8b5b-28cf-79db-bab6-41ecf3336511" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_019c8b5b-28cf-7e41-ac29-8300bdfa57f9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019c8b5b-28cf-7e41-ac29-8300bdfa57f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019c8b5b-28cf-7e41-ac29-8300bdfa57f9" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019c8b5b-28cf-7e41-ac29-8300bdfa57f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019c8b5b-28cf-73a3-81f0-42e31968d03c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019c8b5b-28cf-7e41-ac29-8300bdfa57f9" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019c8b5b-28cf-73a3-81f0-42e31968d03c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EmployeeRelatedCostsMember_019c8b5b-28cf-775a-bfc4-4a6ccdea1fc9" xlink:href="lkq-20260331.xsd#lkq_EmployeeRelatedCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019c8b5b-28cf-73a3-81f0-42e31968d03c" xlink:to="loc_lkq_EmployeeRelatedCostsMember_019c8b5b-28cf-775a-bfc4-4a6ccdea1fc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FacilityClosingMember_019c8b5b-28cf-7c02-bc01-adc09a34e0fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FacilityClosingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019c8b5b-28cf-73a3-81f0-42e31968d03c" xlink:to="loc_us-gaap_FacilityClosingMember_019c8b5b-28cf-7c02-bc01-adc09a34e0fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_InventoryRelatedCostsMember_019c8b5b-28cf-7ac8-b469-3ee17b2f5eb2" xlink:href="lkq-20260331.xsd#lkq_InventoryRelatedCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019c8b5b-28cf-73a3-81f0-42e31968d03c" xlink:to="loc_lkq_InventoryRelatedCostsMember_019c8b5b-28cf-7ac8-b469-3ee17b2f5eb2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_AssetImpairmentsMember_019c8b5b-28cf-76a0-a69f-15a3cb83a910" xlink:href="lkq-20260331.xsd#lkq_AssetImpairmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019c8b5b-28cf-73a3-81f0-42e31968d03c" xlink:to="loc_lkq_AssetImpairmentsMember_019c8b5b-28cf-76a0-a69f-15a3cb83a910" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_019c8b5b-28cf-7c4d-96c0-f8fa07fd6f3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019c8b5b-28cf-73a3-81f0-42e31968d03c" xlink:to="loc_us-gaap_OtherRestructuringMember_019c8b5b-28cf-7c4d-96c0-f8fa07fd6f3a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NatureOfExpenseAxis_019c8b5b-28cf-7699-9c52-6a6b3cc18d09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NatureOfExpenseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c8b5b-28cf-79db-bab6-41ecf3336511" xlink:to="loc_us-gaap_NatureOfExpenseAxis_019c8b5b-28cf-7699-9c52-6a6b3cc18d09" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_019c8b5b-28cf-7699-9c52-6a6b3cc18d09_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterimPeriodCostsNotAllocableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_NatureOfExpenseAxis_019c8b5b-28cf-7699-9c52-6a6b3cc18d09" xlink:to="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_019c8b5b-28cf-7699-9c52-6a6b3cc18d09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_019c8b5b-28cf-77fc-882b-aaa0bd6ae16a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterimPeriodCostsNotAllocableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_NatureOfExpenseAxis_019c8b5b-28cf-7699-9c52-6a6b3cc18d09" xlink:to="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_019c8b5b-28cf-77fc-882b-aaa0bd6ae16a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCosts_019c8b5b-28cf-799f-a70b-f95f30afccc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c8b5b-28cf-7236-9de8-0a336d3774a7" xlink:to="loc_us-gaap_RestructuringCosts_019c8b5b-28cf-799f-a70b-f95f30afccc4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019c8b5b-28cf-7241-8b9f-7209b7b9c15f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c8b5b-28cf-7236-9de8-0a336d3774a7" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019c8b5b-28cf-7241-8b9f-7209b7b9c15f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_019c8b5b-28cf-7afd-8764-ced95d028209" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c8b5b-28cf-7236-9de8-0a336d3774a7" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_019c8b5b-28cf-7afd-8764-ced95d028209" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_019c8b5b-28cf-759a-b52b-37a8a5f6c05c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c8b5b-28cf-7236-9de8-0a336d3774a7" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_019c8b5b-28cf-759a-b52b-37a8a5f6c05c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_019c8b5b-28cf-73eb-9bc9-88f220bf0210" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c8b5b-28cf-7236-9de8-0a336d3774a7" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_019c8b5b-28cf-73eb-9bc9-88f220bf0210" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019c8b5b-28cf-7bd1-8d05-e72ef2cf04ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c8b5b-28cf-7236-9de8-0a336d3774a7" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019c8b5b-28cf-7bd1-8d05-e72ef2cf04ca" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets_019c8b5b-28cf-7029-96d6-9093ae139005" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c8b5b-28cf-7236-9de8-0a336d3774a7" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets_019c8b5b-28cf-7029-96d6-9093ae139005" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities_019c8b5b-28cf-7df6-a618-b3d0ff512c72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c8b5b-28cf-7236-9de8-0a336d3774a7" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities_019c8b5b-28cf-7df6-a618-b3d0ff512c72" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/EarningsPerShareBasicandDilutedDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#EarningsPerShareBasicandDilutedDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/EarningsPerShareBasicandDilutedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ScheduleofEarningsPerShareBasicandDilutedLineItems_019c8b5b-28cf-7481-a00d-6d9a120ab5e4" xlink:href="lkq-20260331.xsd#lkq_ScheduleofEarningsPerShareBasicandDilutedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ScheduleofEarningsPerShareBasicandDilutedTable_019c8b5b-28cf-724d-aa94-0bf3a8e1bdb9" xlink:href="lkq-20260331.xsd#lkq_ScheduleofEarningsPerShareBasicandDilutedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lkq_ScheduleofEarningsPerShareBasicandDilutedLineItems_019c8b5b-28cf-7481-a00d-6d9a120ab5e4" xlink:to="loc_lkq_ScheduleofEarningsPerShareBasicandDilutedTable_019c8b5b-28cf-724d-aa94-0bf3a8e1bdb9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c8b5b-28cf-7bcc-bd2b-d6ba46422757" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ScheduleofEarningsPerShareBasicandDilutedTable_019c8b5b-28cf-724d-aa94-0bf3a8e1bdb9" xlink:to="loc_us-gaap_AwardTypeAxis_019c8b5b-28cf-7bcc-bd2b-d6ba46422757" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c8b5b-28cf-7bcc-bd2b-d6ba46422757_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c8b5b-28cf-7bcc-bd2b-d6ba46422757" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c8b5b-28cf-7bcc-bd2b-d6ba46422757_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c8b5b-28cf-73ae-9fd8-3230f1988f5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c8b5b-28cf-7bcc-bd2b-d6ba46422757" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c8b5b-28cf-73ae-9fd8-3230f1988f5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019c8b5b-28cf-7226-9d7f-1384ac63e555" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c8b5b-28cf-73ae-9fd8-3230f1988f5d" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019c8b5b-28cf-7226-9d7f-1384ac63e555" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_PerformanceBasedRSUMember_019c8b5b-28cf-7632-adff-5b9c537c0036" xlink:href="lkq-20260331.xsd#lkq_PerformanceBasedRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c8b5b-28cf-73ae-9fd8-3230f1988f5d" xlink:to="loc_lkq_PerformanceBasedRSUMember_019c8b5b-28cf-7632-adff-5b9c537c0036" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7312-b51a-1717695378c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ScheduleofEarningsPerShareBasicandDilutedTable_019c8b5b-28cf-724d-aa94-0bf3a8e1bdb9" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7312-b51a-1717695378c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7312-b51a-1717695378c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7312-b51a-1717695378c5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7312-b51a-1717695378c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7a94-b7fc-bd3e667f357b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7312-b51a-1717695378c5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7a94-b7fc-bd3e667f357b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_InterestRateSwapMaturingInFebruary2025Member_019c8b5b-28cf-776b-b9e3-e34fa5d6f5bf" xlink:href="lkq-20260331.xsd#lkq_InterestRateSwapMaturingInFebruary2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7a94-b7fc-bd3e667f357b" xlink:to="loc_lkq_InterestRateSwapMaturingInFebruary2025Member_019c8b5b-28cf-776b-b9e3-e34fa5d6f5bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_019c8b5b-28cf-7e15-a622-b33465288b9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ScheduleofEarningsPerShareBasicandDilutedLineItems_019c8b5b-28cf-7481-a00d-6d9a120ab5e4" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_019c8b5b-28cf-7e15-a622-b33465288b9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019c8b5b-28cf-78c7-ae0c-c92ae269f794" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ScheduleofEarningsPerShareBasicandDilutedLineItems_019c8b5b-28cf-7481-a00d-6d9a120ab5e4" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019c8b5b-28cf-78c7-ae0c-c92ae269f794" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DilutiveSecuritiesAbstract_019c8b5b-28cf-72f3-bf25-5b105812823e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DilutiveSecuritiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ScheduleofEarningsPerShareBasicandDilutedLineItems_019c8b5b-28cf-7481-a00d-6d9a120ab5e4" xlink:to="loc_us-gaap_DilutiveSecuritiesAbstract_019c8b5b-28cf-72f3-bf25-5b105812823e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_019c8b5b-28cf-7dae-88ac-eb884a52ab2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DilutiveSecuritiesAbstract_019c8b5b-28cf-72f3-bf25-5b105812823e" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_019c8b5b-28cf-7dae-88ac-eb884a52ab2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019c8b5b-28cf-78d0-9c79-a1c9ce611e8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DilutiveSecuritiesAbstract_019c8b5b-28cf-72f3-bf25-5b105812823e" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019c8b5b-28cf-78d0-9c79-a1c9ce611e8a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_019c8b5b-28cf-7b2f-a8aa-a7c01b86b348" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ScheduleofEarningsPerShareBasicandDilutedLineItems_019c8b5b-28cf-7481-a00d-6d9a120ab5e4" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_019c8b5b-28cf-7b2f-a8aa-a7c01b86b348" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_019c8b5b-28cf-762f-a73b-b8c889eb596c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ScheduleofEarningsPerShareBasicandDilutedLineItems_019c8b5b-28cf-7481-a00d-6d9a120ab5e4" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_019c8b5b-28cf-762f-a73b-b8c889eb596c" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/ScheduleofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#ScheduleofAccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/ScheduleofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8b5b-28cf-78ee-8675-cfee280e8880" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c8b5b-28cf-74bc-9166-9e01877b341c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8b5b-28cf-78ee-8675-cfee280e8880" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c8b5b-28cf-74bc-9166-9e01877b341c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-79cc-b2cb-01acee6649fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c8b5b-28cf-74bc-9166-9e01877b341c" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-79cc-b2cb-01acee6649fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-79cc-b2cb-01acee6649fd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-79cc-b2cb-01acee6649fd" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-79cc-b2cb-01acee6649fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-75fd-a719-260887e418db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-79cc-b2cb-01acee6649fd" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-75fd-a719-260887e418db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7a77-8c73-6ed7b348ac3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c8b5b-28cf-74bc-9166-9e01877b341c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7a77-8c73-6ed7b348ac3d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7a77-8c73-6ed7b348ac3d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7a77-8c73-6ed7b348ac3d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7a77-8c73-6ed7b348ac3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7846-8708-3a75c5d0dc01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7a77-8c73-6ed7b348ac3d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7846-8708-3a75c5d0dc01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLocationAxis_019c8b5b-28cf-77c7-8a8b-7f47de2ee57e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c8b5b-28cf-74bc-9166-9e01877b341c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLocationAxis_019c8b5b-28cf-77c7-8a8b-7f47de2ee57e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_019c8b5b-28cf-77c7-8a8b-7f47de2ee57e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLocationAxis_019c8b5b-28cf-77c7-8a8b-7f47de2ee57e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_019c8b5b-28cf-77c7-8a8b-7f47de2ee57e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_019c8b5b-28cf-7737-be6d-5b748c42c926" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLocationAxis_019c8b5b-28cf-77c7-8a8b-7f47de2ee57e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_019c8b5b-28cf-7737-be6d-5b748c42c926" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c8b5b-28cf-7213-b0b3-8e5f9c55b53a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c8b5b-28cf-74bc-9166-9e01877b341c" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c8b5b-28cf-7213-b0b3-8e5f9c55b53a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-7213-b0b3-8e5f9c55b53a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c8b5b-28cf-7213-b0b3-8e5f9c55b53a" xlink:to="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-7213-b0b3-8e5f9c55b53a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-7cad-900b-125811f8f07b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c8b5b-28cf-7213-b0b3-8e5f9c55b53a" xlink:to="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-7cad-900b-125811f8f07b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c8b5b-28cf-7e88-af8a-f0cdd7bcf73a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-7cad-900b-125811f8f07b" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c8b5b-28cf-7e88-af8a-f0cdd7bcf73a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c8b5b-28cf-7220-a899-c2f5fc960e3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-7cad-900b-125811f8f07b" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c8b5b-28cf-7220-a899-c2f5fc960e3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_019c8b5b-28cf-7d98-aef6-532d17425e30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-7cad-900b-125811f8f07b" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_019c8b5b-28cf-7d98-aef6-532d17425e30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_AccumulatedGainLossfromUnconsoldatedSubsidiariesMember_019c8b5b-28cf-7d34-8003-f25e5953243c" xlink:href="lkq-20260331.xsd#lkq_AccumulatedGainLossfromUnconsoldatedSubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-7cad-900b-125811f8f07b" xlink:to="loc_lkq_AccumulatedGainLossfromUnconsoldatedSubsidiariesMember_019c8b5b-28cf-7d34-8003-f25e5953243c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c8b5b-28cf-7b78-81e8-0df021a2c2d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-7cad-900b-125811f8f07b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c8b5b-28cf-7b78-81e8-0df021a2c2d2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c8b5b-28cf-71cb-80a8-d4c39f4b1145" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8b5b-28cf-78ee-8675-cfee280e8880" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c8b5b-28cf-71cb-80a8-d4c39f4b1145" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019c8b5b-28cf-7808-9035-a3e092f0de1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8b5b-28cf-78ee-8675-cfee280e8880" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019c8b5b-28cf-7808-9035-a3e092f0de1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_019c8b5b-28cf-7453-8fdb-b7bad4c347b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8b5b-28cf-78ee-8675-cfee280e8880" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_019c8b5b-28cf-7453-8fdb-b7bad4c347b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParentUnrealizedLossGains_019c8b5b-28cf-78d7-8412-5e328f436ff3" xlink:href="lkq-20260331.xsd#lkq_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParentUnrealizedLossGains"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8b5b-28cf-78ee-8675-cfee280e8880" xlink:to="loc_lkq_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParentUnrealizedLossGains_019c8b5b-28cf-78d7-8412-5e328f436ff3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ReclassificationFromAociCurrentPeriodAttributableToParentDeferredIncomeTax_019c8b5b-28cf-7f14-8ba3-2255a3dfe50f" xlink:href="lkq-20260331.xsd#lkq_ReclassificationFromAociCurrentPeriodAttributableToParentDeferredIncomeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8b5b-28cf-78ee-8675-cfee280e8880" xlink:to="loc_lkq_ReclassificationFromAociCurrentPeriodAttributableToParentDeferredIncomeTax_019c8b5b-28cf-7f14-8ba3-2255a3dfe50f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_OtherComprehensiveIncomeLossBeforeReclassificationsDisposalOfBusiness_019c8b5b-28cf-7616-9322-54e7c805f16a" xlink:href="lkq-20260331.xsd#lkq_OtherComprehensiveIncomeLossBeforeReclassificationsDisposalOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8b5b-28cf-78ee-8675-cfee280e8880" xlink:to="loc_lkq_OtherComprehensiveIncomeLossBeforeReclassificationsDisposalOfBusiness_019c8b5b-28cf-7616-9322-54e7c805f16a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_OtherComprehensiveLossIncomeBeforeReclassificationUnconsolidatedSubsidiary_019c8b5b-28cf-75b9-b89c-4bd8c43fc724" xlink:href="lkq-20260331.xsd#lkq_OtherComprehensiveLossIncomeBeforeReclassificationUnconsolidatedSubsidiary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c8b5b-28cf-78ee-8675-cfee280e8880" xlink:to="loc_lkq_OtherComprehensiveLossIncomeBeforeReclassificationUnconsolidatedSubsidiary_019c8b5b-28cf-75b9-b89c-4bd8c43fc724" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/AccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#AccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/AccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ScheduleofAccumulatedOtherComprehensiveIncomeLossLineItems_019c8b5b-28cf-7039-97b0-b006caa0c5af" xlink:href="lkq-20260331.xsd#lkq_ScheduleofAccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ScheduleofAccumulatedOtherComprehensiveIncomeLossTable_019c8b5b-28cf-7d16-a40b-b33a36652473" xlink:href="lkq-20260331.xsd#lkq_ScheduleofAccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lkq_ScheduleofAccumulatedOtherComprehensiveIncomeLossLineItems_019c8b5b-28cf-7039-97b0-b006caa0c5af" xlink:to="loc_lkq_ScheduleofAccumulatedOtherComprehensiveIncomeLossTable_019c8b5b-28cf-7d16-a40b-b33a36652473" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_AccumulatedOtherComprehensiveIncomeAxis_019c8b5b-28cf-7d63-aec0-e04f27986d49" xlink:href="lkq-20260331.xsd#lkq_AccumulatedOtherComprehensiveIncomeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ScheduleofAccumulatedOtherComprehensiveIncomeLossTable_019c8b5b-28cf-7d16-a40b-b33a36652473" xlink:to="loc_lkq_AccumulatedOtherComprehensiveIncomeAxis_019c8b5b-28cf-7d63-aec0-e04f27986d49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_AccumulatedOtherComprehensiveIncomeDomain_019c8b5b-28cf-7d63-aec0-e04f27986d49_default" xlink:href="lkq-20260331.xsd#lkq_AccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lkq_AccumulatedOtherComprehensiveIncomeAxis_019c8b5b-28cf-7d63-aec0-e04f27986d49" xlink:to="loc_lkq_AccumulatedOtherComprehensiveIncomeDomain_019c8b5b-28cf-7d63-aec0-e04f27986d49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_AccumulatedOtherComprehensiveIncomeDomain_019c8b5b-28cf-799d-924a-c7485fc2dd55" xlink:href="lkq-20260331.xsd#lkq_AccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lkq_AccumulatedOtherComprehensiveIncomeAxis_019c8b5b-28cf-7d63-aec0-e04f27986d49" xlink:to="loc_lkq_AccumulatedOtherComprehensiveIncomeDomain_019c8b5b-28cf-799d-924a-c7485fc2dd55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c8b5b-28cf-714c-8cee-e6961265e132" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ScheduleofAccumulatedOtherComprehensiveIncomeLossTable_019c8b5b-28cf-7d16-a40b-b33a36652473" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c8b5b-28cf-714c-8cee-e6961265e132" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-714c-8cee-e6961265e132_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c8b5b-28cf-714c-8cee-e6961265e132" xlink:to="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-714c-8cee-e6961265e132_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-79da-a02d-39fb8f72af1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c8b5b-28cf-714c-8cee-e6961265e132" xlink:to="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-79da-a02d-39fb8f72af1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c8b5b-28cf-7147-b77f-edac537e7dca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-79da-a02d-39fb8f72af1c" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c8b5b-28cf-7147-b77f-edac537e7dca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_019c8b5b-28cf-7778-a8e9-b0b64722f295" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-79da-a02d-39fb8f72af1c" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_019c8b5b-28cf-7778-a8e9-b0b64722f295" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_AccumulatedGainLossfromUnconsoldatedSubsidiariesMember_019c8b5b-28cf-7e39-bdfe-680b78661201" xlink:href="lkq-20260331.xsd#lkq_AccumulatedGainLossfromUnconsoldatedSubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c8b5b-28cf-79da-a02d-39fb8f72af1c" xlink:to="loc_lkq_AccumulatedGainLossfromUnconsoldatedSubsidiariesMember_019c8b5b-28cf-7e39-bdfe-680b78661201" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7ff6-ab1a-a7a0d9d165b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ScheduleofAccumulatedOtherComprehensiveIncomeLossTable_019c8b5b-28cf-7d16-a40b-b33a36652473" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7ff6-ab1a-a7a0d9d165b0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7ff6-ab1a-a7a0d9d165b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7ff6-ab1a-a7a0d9d165b0" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7ff6-ab1a-a7a0d9d165b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7ac9-9063-e395fe3508be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7ff6-ab1a-a7a0d9d165b0" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7ac9-9063-e395fe3508be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019c8b5b-28cf-7035-94a4-fbe401a92bde" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7ac9-9063-e395fe3508be" xlink:to="loc_us-gaap_InterestRateSwapMember_019c8b5b-28cf-7035-94a4-fbe401a92bde" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForwardContractsMember_019c8b5b-28cf-70aa-8ec6-526a6fd9ac66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForwardContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7ac9-9063-e395fe3508be" xlink:to="loc_us-gaap_ForwardContractsMember_019c8b5b-28cf-70aa-8ec6-526a6fd9ac66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-7774-87eb-dbc918095b2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ScheduleofAccumulatedOtherComprehensiveIncomeLossTable_019c8b5b-28cf-7d16-a40b-b33a36652473" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-7774-87eb-dbc918095b2e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-7774-87eb-dbc918095b2e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-7774-87eb-dbc918095b2e" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-7774-87eb-dbc918095b2e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-7f0f-87f7-3d2557842554" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-7774-87eb-dbc918095b2e" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-7f0f-87f7-3d2557842554" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/SupplyChainFinancingDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#SupplyChainFinancingDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/SupplyChainFinancingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplierFinanceProgramLineItems_019c8b5b-28cf-7630-afa1-9e32f30f06de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplierFinanceProgramLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplierFinanceProgramTable_019c8b5b-28cf-7696-a1fa-2b71425e93d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplierFinanceProgramTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SupplierFinanceProgramLineItems_019c8b5b-28cf-7630-afa1-9e32f30f06de" xlink:to="loc_us-gaap_SupplierFinanceProgramTable_019c8b5b-28cf-7696-a1fa-2b71425e93d8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_019c8b5b-28cf-77b9-a378-b507f28ccdf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SupplierFinanceProgramTable_019c8b5b-28cf-7696-a1fa-2b71425e93d8" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_019c8b5b-28cf-77b9-a378-b507f28ccdf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-77b9-a378-b507f28ccdf6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019c8b5b-28cf-77b9-a378-b507f28ccdf6" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-77b9-a378-b507f28ccdf6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7fc6-8e16-1035fa7d53d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019c8b5b-28cf-77b9-a378-b507f28ccdf6" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7fc6-8e16-1035fa7d53d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplierFinanceProgramObligationCurrent_019c8b5b-28cf-7978-95c3-aeb0d448bb0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplierFinanceProgramObligationCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplierFinanceProgramLineItems_019c8b5b-28cf-7630-afa1-9e32f30f06de" xlink:to="loc_us-gaap_SupplierFinanceProgramObligationCurrent_019c8b5b-28cf-7978-95c3-aeb0d448bb0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplierFinanceProgramObligation_019c8b5b-28cf-7811-a754-ce1f5b29d549" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplierFinanceProgramObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplierFinanceProgramLineItems_019c8b5b-28cf-7630-afa1-9e32f30f06de" xlink:to="loc_us-gaap_SupplierFinanceProgramObligation_019c8b5b-28cf-7811-a754-ce1f5b29d549" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/ScheduleofLongTermObligationsDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#ScheduleofLongTermObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/ScheduleofLongTermObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c8b5b-28cf-7fc3-9781-1840f8388d75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_us-gaap_DebtInstrumentTable_019c8b5b-28cf-7fc3-9781-1840f8388d75" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019c8b5b-28cf-7479-982b-88b4915f86f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8b5b-28cf-7fc3-9781-1840f8388d75" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019c8b5b-28cf-7479-982b-88b4915f86f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019c8b5b-28cf-7479-982b-88b4915f86f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019c8b5b-28cf-7479-982b-88b4915f86f4" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019c8b5b-28cf-7479-982b-88b4915f86f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019c8b5b-28cf-7f78-9d0b-91f46c5b9360" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019c8b5b-28cf-7479-982b-88b4915f86f4" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019c8b5b-28cf-7f78-9d0b-91f46c5b9360" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_019c8b5b-28cf-7a30-85a8-30188aedec62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8b5b-28cf-7fc3-9781-1840f8388d75" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_019c8b5b-28cf-7a30-85a8-30188aedec62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019c8b5b-28cf-7a30-85a8-30188aedec62_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019c8b5b-28cf-7a30-85a8-30188aedec62" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019c8b5b-28cf-7a30-85a8-30188aedec62_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019c8b5b-28cf-7022-bb74-5922c66ef9ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019c8b5b-28cf-7a30-85a8-30188aedec62" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019c8b5b-28cf-7022-bb74-5922c66ef9ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember_019c8b5b-28cf-7116-b7d0-a1b3710d7aac" xlink:href="lkq-20260331.xsd#lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_019c8b5b-28cf-7022-bb74-5922c66ef9ad" xlink:to="loc_lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember_019c8b5b-28cf-7116-b7d0-a1b3710d7aac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019c8b5b-28cf-7bcc-8f56-244ec4a11d6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8b5b-28cf-7fc3-9781-1840f8388d75" xlink:to="loc_us-gaap_CreditFacilityAxis_019c8b5b-28cf-7bcc-8f56-244ec4a11d6c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c8b5b-28cf-7bcc-8f56-244ec4a11d6c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019c8b5b-28cf-7bcc-8f56-244ec4a11d6c" xlink:to="loc_us-gaap_CreditFacilityDomain_019c8b5b-28cf-7bcc-8f56-244ec4a11d6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c8b5b-28cf-7315-b596-06f67a4595d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019c8b5b-28cf-7bcc-8f56-244ec4a11d6c" xlink:to="loc_us-gaap_CreditFacilityDomain_019c8b5b-28cf-7315-b596-06f67a4595d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c8b5b-28cf-7c41-a92d-70c48283bd39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019c8b5b-28cf-7315-b596-06f67a4595d7" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c8b5b-28cf-7c41-a92d-70c48283bd39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-76d6-829d-0861228bcae3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8b5b-28cf-7fc3-9781-1840f8388d75" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-76d6-829d-0861228bcae3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-76d6-829d-0861228bcae3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-76d6-829d-0861228bcae3" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-76d6-829d-0861228bcae3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7013-8137-572e604723be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-76d6-829d-0861228bcae3" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7013-8137-572e604723be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7387-b2b8-54f38efb5f87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8b5b-28cf-7fc3-9781-1840f8388d75" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7387-b2b8-54f38efb5f87" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7387-b2b8-54f38efb5f87_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7387-b2b8-54f38efb5f87" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7387-b2b8-54f38efb5f87_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7b5e-bf0d-5c860a0c104a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7387-b2b8-54f38efb5f87" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7b5e-bf0d-5c860a0c104a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c8b5b-28cf-7437-8b00-599a138fb24c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8b5b-28cf-7fc3-9781-1840f8388d75" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c8b5b-28cf-7437-8b00-599a138fb24c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c8b5b-28cf-7437-8b00-599a138fb24c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c8b5b-28cf-7437-8b00-599a138fb24c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c8b5b-28cf-7437-8b00-599a138fb24c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c8b5b-28cf-7c4e-9595-b7330018c82d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c8b5b-28cf-7437-8b00-599a138fb24c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c8b5b-28cf-7c4e-9595-b7330018c82d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-28cf-7003-addc-7c1ba1c600db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c8b5b-28cf-7fc3-9781-1840f8388d75" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-28cf-7003-addc-7c1ba1c600db" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7003-addc-7c1ba1c600db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-28cf-7003-addc-7c1ba1c600db" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7003-addc-7c1ba1c600db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-28cf-7003-addc-7c1ba1c600db" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_019c8b5b-28cf-754c-bf5a-49203e8c1d83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:to="loc_us-gaap_LoansPayableMember_019c8b5b-28cf-754c-bf5a-49203e8c1d83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SeniorUnsecuredCreditAgreementTermLoanPayableMember_019c8b5b-28cf-7af9-a4a6-3ca1f3b2917c" xlink:href="lkq-20260331.xsd#lkq_SeniorUnsecuredCreditAgreementTermLoanPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:to="loc_lkq_SeniorUnsecuredCreditAgreementTermLoanPayableMember_019c8b5b-28cf-7af9-a4a6-3ca1f3b2917c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember_019c8b5b-28cf-79f7-8b8d-b326fe71efb5" xlink:href="lkq-20260331.xsd#lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:to="loc_lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember_019c8b5b-28cf-79f7-8b8d-b326fe71efb5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SeniorUnsecuredTermLoanCreditAgreementCADNoteMember_019c8b5b-28cf-7c9e-9908-8ab03776bf5b" xlink:href="lkq-20260331.xsd#lkq_SeniorUnsecuredTermLoanCreditAgreementCADNoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:to="loc_lkq_SeniorUnsecuredTermLoanCreditAgreementCADNoteMember_019c8b5b-28cf-7c9e-9908-8ab03776bf5b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c8b5b-28cf-7c98-9338-5aa801938fe3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c8b5b-28cf-7c98-9338-5aa801938fe3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_U.S.Notes2028Member_019c8b5b-28cf-70e3-bc17-f1f4c4a9e544" xlink:href="lkq-20260331.xsd#lkq_U.S.Notes2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:to="loc_lkq_U.S.Notes2028Member_019c8b5b-28cf-70e3-bc17-f1f4c4a9e544" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_USNotes2033Member_019c8b5b-28cf-79e0-8cd4-525eb6fbfab6" xlink:href="lkq-20260331.xsd#lkq_USNotes2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:to="loc_lkq_USNotes2033Member_019c8b5b-28cf-79e0-8cd4-525eb6fbfab6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuroNotes2024Member_019c8b5b-28cf-71c5-a15c-8b375e067372" xlink:href="lkq-20260331.xsd#lkq_EuroNotes2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:to="loc_lkq_EuroNotes2024Member_019c8b5b-28cf-71c5-a15c-8b375e067372" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuroNotes2028Member_019c8b5b-28cf-7d3d-9b18-cfe0e90f8d68" xlink:href="lkq-20260331.xsd#lkq_EuroNotes2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:to="loc_lkq_EuroNotes2028Member_019c8b5b-28cf-7d3d-9b18-cfe0e90f8d68" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuroNotes2031Member_019c8b5b-28cf-7e84-bdbd-768e5733a2a0" xlink:href="lkq-20260331.xsd#lkq_EuroNotes2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:to="loc_lkq_EuroNotes2031Member_019c8b5b-28cf-7e84-bdbd-768e5733a2a0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_NotesPayableMember_019c8b5b-28cf-7082-a9a1-e12bbc35e447" xlink:href="lkq-20260331.xsd#lkq_NotesPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:to="loc_lkq_NotesPayableMember_019c8b5b-28cf-7082-a9a1-e12bbc35e447" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_OtherDebtMember_019c8b5b-28cf-7699-9638-624291a075fa" xlink:href="lkq-20260331.xsd#lkq_OtherDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7577-a36d-9a2b48db8806" xlink:to="loc_lkq_OtherDebtMember_019c8b5b-28cf-7699-9638-624291a075fa" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt_019c8b5b-28cf-7466-895d-42a39d7e10c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_us-gaap_UnsecuredDebt_019c8b5b-28cf-7466-895d-42a39d7e10c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019c8b5b-28cf-7fa9-9134-4a2e195853ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_us-gaap_LineOfCredit_019c8b5b-28cf-7fa9-9134-4a2e195853ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019c8b5b-28cf-74b0-9662-a8e9c66a06ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_us-gaap_LongTermDebt_019c8b5b-28cf-74b0-9662-a8e9c66a06ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayable_019c8b5b-28cf-702b-9787-4264124e53f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_us-gaap_NotesPayable_019c8b5b-28cf-702b-9787-4264124e53f8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_019c8b5b-28cf-71a5-b1c6-76d42565fa32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_us-gaap_FinanceLeaseLiability_019c8b5b-28cf-71a5-b1c6-76d42565fa32" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_019c8b5b-28cf-799c-a460-3c1fd4f0d6d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_019c8b5b-28cf-799c-a460-3c1fd4f0d6d1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_OtherDebt_019c8b5b-28cf-77a0-8f01-931feeb3f263" xlink:href="lkq-20260331.xsd#lkq_OtherDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_lkq_OtherDebt_019c8b5b-28cf-77a0-8f01-931feeb3f263" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_019c8b5b-28cf-7d9c-8555-1bd7d86f298d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_us-gaap_DebtAndCapitalLeaseObligations_019c8b5b-28cf-7d9c-8555-1bd7d86f298d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019c8b5b-28cf-7426-8d53-d2fe47a3f923" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019c8b5b-28cf-7426-8d53-d2fe47a3f923" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_DebtandCapitalLeaseObligationsNet_019c8b5b-28cf-7a16-a090-6b587909a62d" xlink:href="lkq-20260331.xsd#lkq_DebtandCapitalLeaseObligationsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_lkq_DebtandCapitalLeaseObligationsNet_019c8b5b-28cf-7a16-a090-6b587909a62d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_LongtermDebtandCapitalLeaseObligationsCurrentNet_019c8b5b-28cf-73af-8772-8c150e9977ab" xlink:href="lkq-20260331.xsd#lkq_LongtermDebtandCapitalLeaseObligationsCurrentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_lkq_LongtermDebtandCapitalLeaseObligationsCurrentNet_019c8b5b-28cf-73af-8772-8c150e9977ab" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_LongTermDebtandCapitalLeaseObligationsExcludingCurrentPortionNet_019c8b5b-28cf-7687-bbb3-4719c7b57a51" xlink:href="lkq-20260331.xsd#lkq_LongTermDebtandCapitalLeaseObligationsExcludingCurrentPortionNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_lkq_LongTermDebtandCapitalLeaseObligationsExcludingCurrentPortionNet_019c8b5b-28cf-7687-bbb3-4719c7b57a51" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_019c8b5b-28cf-73f9-a53e-c794d46744d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_019c8b5b-28cf-73f9-a53e-c794d46744d5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019c8b5b-28cf-79c5-b3ea-53cc25ad7a04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019c8b5b-28cf-79c5-b3ea-53cc25ad7a04" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_019ddebb-1bcf-74d0-908d-300c7c908cae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c8b5b-28cf-7ce9-aee7-9dc74ba11813" xlink:to="loc_us-gaap_InterestPaidNet_019ddebb-1bcf-74d0-908d-300c7c908cae" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/DerivativeInstrumentsandHedgingActivitiesDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#DerivativeInstrumentsandHedgingActivitiesDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/DerivativeInstrumentsandHedgingActivitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c8b5b-28cf-7c2f-b3dc-825dcdd55129" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c8b5b-28cf-7a2d-a8d8-ded1190e8a1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c8b5b-28cf-7c2f-b3dc-825dcdd55129" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c8b5b-28cf-7a2d-a8d8-ded1190e8a1d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c8b5b-28cf-7024-b1dc-c055dca8900f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c8b5b-28cf-7a2d-a8d8-ded1190e8a1d" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c8b5b-28cf-7024-b1dc-c055dca8900f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-7024-b1dc-c055dca8900f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c8b5b-28cf-7024-b1dc-c055dca8900f" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-7024-b1dc-c055dca8900f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-7bf0-a53e-45182c67a59d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c8b5b-28cf-7024-b1dc-c055dca8900f" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-7bf0-a53e-45182c67a59d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019c8b5b-28cf-7c18-926e-82bd8b6f0f05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-7bf0-a53e-45182c67a59d" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019c8b5b-28cf-7c18-926e-82bd8b6f0f05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019c8b5b-28cf-75a1-8adf-690c535a4e88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-7bf0-a53e-45182c67a59d" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019c8b5b-28cf-75a1-8adf-690c535a4e88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8b5b-28cf-7eab-8d42-44c52436b6f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c8b5b-28cf-7a2d-a8d8-ded1190e8a1d" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8b5b-28cf-7eab-8d42-44c52436b6f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7eab-8d42-44c52436b6f5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8b5b-28cf-7eab-8d42-44c52436b6f5" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7eab-8d42-44c52436b6f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7508-8c8a-090829f07cd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8b5b-28cf-7eab-8d42-44c52436b6f5" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7508-8c8a-090829f07cd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019c8b5b-28cf-7d81-a65f-2d77d2422e9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7508-8c8a-090829f07cd8" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019c8b5b-28cf-7d81-a65f-2d77d2422e9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7480-8660-fc3e7b025cb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c8b5b-28cf-7a2d-a8d8-ded1190e8a1d" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7480-8660-fc3e7b025cb7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-7480-8660-fc3e7b025cb7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7480-8660-fc3e7b025cb7" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-7480-8660-fc3e7b025cb7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-79a9-a11b-4327d4734d8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7480-8660-fc3e7b025cb7" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-79a9-a11b-4327d4734d8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ContingentConsiderationLiabilitiesMember_019c8b5b-28cf-7fa6-b0e1-458b7387face" xlink:href="lkq-20260331.xsd#lkq_ContingentConsiderationLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-79a9-a11b-4327d4734d8d" xlink:to="loc_lkq_ContingentConsiderationLiabilitiesMember_019c8b5b-28cf-7fa6-b0e1-458b7387face" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019c8b5b-28cf-7834-b6e4-f4637ff24a3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-79a9-a11b-4327d4734d8d" xlink:to="loc_us-gaap_InterestRateSwapMember_019c8b5b-28cf-7834-b6e4-f4637ff24a3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7b19-9699-3ca56f483ab8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c8b5b-28cf-7a2d-a8d8-ded1190e8a1d" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7b19-9699-3ca56f483ab8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7b19-9699-3ca56f483ab8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7b19-9699-3ca56f483ab8" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7b19-9699-3ca56f483ab8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7f85-bb34-1804e13e4db6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-7b19-9699-3ca56f483ab8" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7f85-bb34-1804e13e4db6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForwardContractsMember_019c8b5b-28cf-7db5-adb0-36b723548a02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForwardContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7f85-bb34-1804e13e4db6" xlink:to="loc_us-gaap_ForwardContractsMember_019c8b5b-28cf-7db5-adb0-36b723548a02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019c8b5b-28cf-7fd9-95d5-5700ea05ebe5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7f85-bb34-1804e13e4db6" xlink:to="loc_us-gaap_InterestRateSwapMember_019c8b5b-28cf-7fd9-95d5-5700ea05ebe5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_InterestRateSwapMaturingInFebruary2026Member_019c8b5b-28cf-7bb1-93cd-a5b44c2c0494" xlink:href="lkq-20260331.xsd#lkq_InterestRateSwapMaturingInFebruary2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7f85-bb34-1804e13e4db6" xlink:to="loc_lkq_InterestRateSwapMaturingInFebruary2026Member_019c8b5b-28cf-7bb1-93cd-a5b44c2c0494" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_InterestRateSwapMaturingInFebruary2025Member_019c8b5b-28cf-71d8-9bc0-36c7cf49c5c2" xlink:href="lkq-20260331.xsd#lkq_InterestRateSwapMaturingInFebruary2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7f85-bb34-1804e13e4db6" xlink:to="loc_lkq_InterestRateSwapMaturingInFebruary2025Member_019c8b5b-28cf-71d8-9bc0-36c7cf49c5c2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ForwardStartingInterestRateSwapsMember_019c8b5b-28cf-7e77-9ee0-61afb1da11de" xlink:href="lkq-20260331.xsd#lkq_ForwardStartingInterestRateSwapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7f85-bb34-1804e13e4db6" xlink:to="loc_lkq_ForwardStartingInterestRateSwapsMember_019c8b5b-28cf-7e77-9ee0-61afb1da11de" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_019c8b5b-28cf-7030-a763-a8164c02f250" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c8b5b-28cf-7a2d-a8d8-ded1190e8a1d" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_019c8b5b-28cf-7030-a763-a8164c02f250" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7030-a763-a8164c02f250_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019c8b5b-28cf-7030-a763-a8164c02f250" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7030-a763-a8164c02f250_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7303-969e-d4d44ee7f9ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019c8b5b-28cf-7030-a763-a8164c02f250" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7303-969e-d4d44ee7f9ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_019c8b5b-28cf-7b86-ae2a-5c05fe75606a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7303-969e-d4d44ee7f9ac" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_019c8b5b-28cf-7b86-ae2a-5c05fe75606a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_AccruedLiabilitiesCurrentMember_019c8b5b-28cf-7a50-b83b-c152d5b4c07f" xlink:href="lkq-20260331.xsd#lkq_AccruedLiabilitiesCurrentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7303-969e-d4d44ee7f9ac" xlink:to="loc_lkq_AccruedLiabilitiesCurrentMember_019c8b5b-28cf-7a50-b83b-c152d5b4c07f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_019c8b5b-28cf-7d12-84f5-ad179480fdee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7303-969e-d4d44ee7f9ac" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_019c8b5b-28cf-7d12-84f5-ad179480fdee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_019c8b5b-28cf-7c12-b829-6eb74d2639ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019c8b5b-28cf-7303-969e-d4d44ee7f9ac" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_019c8b5b-28cf-7c12-b829-6eb74d2639ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-7fab-bf1b-8c7106663c13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c8b5b-28cf-7a2d-a8d8-ded1190e8a1d" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-7fab-bf1b-8c7106663c13" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-7fab-bf1b-8c7106663c13_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-7fab-bf1b-8c7106663c13" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-7fab-bf1b-8c7106663c13_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-73c6-8ca1-31c1c498ac7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c8b5b-28cf-7fab-bf1b-8c7106663c13" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c8b5b-28cf-73c6-8ca1-31c1c498ac7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_InterestRateSwapMaturityAxis_019c8b5b-28cf-7573-a031-bd3ae1136152" xlink:href="lkq-20260331.xsd#lkq_InterestRateSwapMaturityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c8b5b-28cf-7a2d-a8d8-ded1190e8a1d" xlink:to="loc_lkq_InterestRateSwapMaturityAxis_019c8b5b-28cf-7573-a031-bd3ae1136152" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_InterestRateSwapMaturityDomain_019c8b5b-28cf-7573-a031-bd3ae1136152_default" xlink:href="lkq-20260331.xsd#lkq_InterestRateSwapMaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lkq_InterestRateSwapMaturityAxis_019c8b5b-28cf-7573-a031-bd3ae1136152" xlink:to="loc_lkq_InterestRateSwapMaturityDomain_019c8b5b-28cf-7573-a031-bd3ae1136152_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_InterestRateSwapMaturityDomain_019c8b5b-28cf-7f81-a0a9-cfc28dea4536" xlink:href="lkq-20260331.xsd#lkq_InterestRateSwapMaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lkq_InterestRateSwapMaturityAxis_019c8b5b-28cf-7573-a031-bd3ae1136152" xlink:to="loc_lkq_InterestRateSwapMaturityDomain_019c8b5b-28cf-7f81-a0a9-cfc28dea4536" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_InterestRateSwapMaturingInNovember2025Member_019c8b5b-28cf-762a-af6e-3f6bd9041ba7" xlink:href="lkq-20260331.xsd#lkq_InterestRateSwapMaturingInNovember2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_InterestRateSwapMaturityDomain_019c8b5b-28cf-7f81-a0a9-cfc28dea4536" xlink:to="loc_lkq_InterestRateSwapMaturingInNovember2025Member_019c8b5b-28cf-762a-af6e-3f6bd9041ba7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_InterestRateSwapMaturingInFebruary2025Member_019c8b5b-28cf-7529-b149-39d91a64adb9" xlink:href="lkq-20260331.xsd#lkq_InterestRateSwapMaturingInFebruary2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_InterestRateSwapMaturityDomain_019c8b5b-28cf-7f81-a0a9-cfc28dea4536" xlink:to="loc_lkq_InterestRateSwapMaturingInFebruary2025Member_019c8b5b-28cf-7529-b149-39d91a64adb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_InterestRateSwapMaturingInFebruary2026Member_019c8b5b-28cf-7593-a2d2-743538a3391a" xlink:href="lkq-20260331.xsd#lkq_InterestRateSwapMaturingInFebruary2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_InterestRateSwapMaturityDomain_019c8b5b-28cf-7f81-a0a9-cfc28dea4536" xlink:to="loc_lkq_InterestRateSwapMaturingInFebruary2026Member_019c8b5b-28cf-7593-a2d2-743538a3391a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019c8b5b-28cf-7958-b667-c427920ee92c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c8b5b-28cf-7c2f-b3dc-825dcdd55129" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019c8b5b-28cf-7958-b667-c427920ee92c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAverageFixedInterestRate_019c8b5b-28cf-766b-9b7a-813bcd30fc61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAverageFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c8b5b-28cf-7c2f-b3dc-825dcdd55129" xlink:to="loc_us-gaap_DerivativeAverageFixedInterestRate_019c8b5b-28cf-766b-9b7a-813bcd30fc61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019c8b5b-28cf-7ba3-8cac-26a69f3df1a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c8b5b-28cf-7c2f-b3dc-825dcdd55129" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019c8b5b-28cf-7ba3-8cac-26a69f3df1a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromHedgeInvestingActivities_019c8b5b-28cf-76a4-9f24-682809f71c95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromHedgeInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c8b5b-28cf-7c2f-b3dc-825dcdd55129" xlink:to="loc_us-gaap_PaymentsForProceedsFromHedgeInvestingActivities_019c8b5b-28cf-76a4-9f24-682809f71c95" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_019c8b5b-28cf-71c4-95e6-fb5df3a522a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c8b5b-28cf-7c2f-b3dc-825dcdd55129" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_019c8b5b-28cf-71c4-95e6-fb5df3a522a0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromHedgeFinancingActivities_019c8b5b-28cf-7ca1-bb2f-8d37bef4aabc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromHedgeFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c8b5b-28cf-7c2f-b3dc-825dcdd55129" xlink:to="loc_us-gaap_PaymentsForProceedsFromHedgeFinancingActivities_019c8b5b-28cf-7ca1-bb2f-8d37bef4aabc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019ddeee-cbb9-70cd-80bd-e31761a10e55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c8b5b-28cf-7c2f-b3dc-825dcdd55129" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019ddeee-cbb9-70cd-80bd-e31761a10e55" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_019c8b5b-28cf-7cb2-9420-84994b2e2132" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c8b5b-28cf-7c2f-b3dc-825dcdd55129" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_019c8b5b-28cf-7cb2-9420-84994b2e2132" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/ScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#ScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/ScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ClassificationLineItems_019c8b5b-28cf-77ad-82c9-de0d90929537" xlink:href="lkq-20260331.xsd#lkq_ClassificationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ClassificationTable_019c8b5b-28cf-7863-a3ac-ce54b2afeaf8" xlink:href="lkq-20260331.xsd#lkq_ClassificationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lkq_ClassificationLineItems_019c8b5b-28cf-77ad-82c9-de0d90929537" xlink:to="loc_lkq_ClassificationTable_019c8b5b-28cf-7863-a3ac-ce54b2afeaf8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c8b5b-28cf-76c9-9952-e61079f277a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ClassificationTable_019c8b5b-28cf-7863-a3ac-ce54b2afeaf8" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c8b5b-28cf-76c9-9952-e61079f277a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-76c9-9952-e61079f277a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c8b5b-28cf-76c9-9952-e61079f277a2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-76c9-9952-e61079f277a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-7ce6-a1bb-5fae192ab7cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c8b5b-28cf-76c9-9952-e61079f277a2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-7ce6-a1bb-5fae192ab7cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019c8b5b-28cf-73b0-add1-2b5541c9147f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-7ce6-a1bb-5fae192ab7cf" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019c8b5b-28cf-73b0-add1-2b5541c9147f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019c8b5b-28cf-79c9-8ac1-685eeaa00aff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-7ce6-a1bb-5fae192ab7cf" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019c8b5b-28cf-79c9-8ac1-685eeaa00aff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019c8b5b-28cf-7e48-9042-dffd16b6d851" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c8b5b-28cf-7ce6-a1bb-5fae192ab7cf" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019c8b5b-28cf-7e48-9042-dffd16b6d851" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8b5b-28cf-7815-a93a-57302975e8c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ClassificationTable_019c8b5b-28cf-7863-a3ac-ce54b2afeaf8" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8b5b-28cf-7815-a93a-57302975e8c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7815-a93a-57302975e8c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8b5b-28cf-7815-a93a-57302975e8c7" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7815-a93a-57302975e8c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7520-8d89-56a22acd3f1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c8b5b-28cf-7815-a93a-57302975e8c7" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7520-8d89-56a22acd3f1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019c8b5b-28cf-7b44-8182-fc8ec9ea593f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c8b5b-28cf-7520-8d89-56a22acd3f1f" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019c8b5b-28cf-7b44-8182-fc8ec9ea593f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7ecb-93b1-958d16d9c7bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ClassificationTable_019c8b5b-28cf-7863-a3ac-ce54b2afeaf8" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7ecb-93b1-958d16d9c7bd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-7ecb-93b1-958d16d9c7bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7ecb-93b1-958d16d9c7bd" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-7ecb-93b1-958d16d9c7bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-73e5-82ea-3788ffa1f510" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7ecb-93b1-958d16d9c7bd" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-73e5-82ea-3788ffa1f510" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019c8b5b-28cf-7bc9-8015-b008b1516b1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-73e5-82ea-3788ffa1f510" xlink:to="loc_us-gaap_DebtSecuritiesMember_019c8b5b-28cf-7bc9-8015-b008b1516b1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019c8b5b-28cf-73b9-8770-925f564d4a89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-73e5-82ea-3788ffa1f510" xlink:to="loc_us-gaap_EquitySecuritiesMember_019c8b5b-28cf-73b9-8770-925f564d4a89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019c8b5b-28cf-7453-a303-349fc2a7c9af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-73e5-82ea-3788ffa1f510" xlink:to="loc_us-gaap_InterestRateSwapMember_019c8b5b-28cf-7453-a303-349fc2a7c9af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ContingentConsiderationLiabilitiesMember_019c8b5b-28cf-7dec-b916-5da20f6fb972" xlink:href="lkq-20260331.xsd#lkq_ContingentConsiderationLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-73e5-82ea-3788ffa1f510" xlink:to="loc_lkq_ContingentConsiderationLiabilitiesMember_019c8b5b-28cf-7dec-b916-5da20f6fb972" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019c8b5b-28cf-75d1-8275-b91a33552a60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ClassificationLineItems_019c8b5b-28cf-77ad-82c9-de0d90929537" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019c8b5b-28cf-75d1-8275-b91a33552a60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019c8b5b-28cf-73c4-a11f-24739783e737" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ClassificationLineItems_019c8b5b-28cf-77ad-82c9-de0d90929537" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019c8b5b-28cf-73c4-a11f-24739783e737" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/FairValueMeasurementsDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#FairValueMeasurementsDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/FairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisLineItems_019c8b5b-28cf-7a91-883c-cd6eeef0c147" xlink:href="lkq-20260331.xsd#lkq_ScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisTable_019c8b5b-28cf-7fbe-b40d-63733460d43f" xlink:href="lkq-20260331.xsd#lkq_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lkq_ScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisLineItems_019c8b5b-28cf-7a91-883c-cd6eeef0c147" xlink:to="loc_lkq_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisTable_019c8b5b-28cf-7fbe-b40d-63733460d43f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-28cf-7a0a-a72e-90498be9b916" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisTable_019c8b5b-28cf-7fbe-b40d-63733460d43f" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-28cf-7a0a-a72e-90498be9b916" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7a0a-a72e-90498be9b916_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-28cf-7a0a-a72e-90498be9b916" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7a0a-a72e-90498be9b916_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7946-9e50-bd9fa7a68eba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-28cf-7a0a-a72e-90498be9b916" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7946-9e50-bd9fa7a68eba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember_019c8b5b-28cf-7564-99cb-0f08ad4b01a4" xlink:href="lkq-20260331.xsd#lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7946-9e50-bd9fa7a68eba" xlink:to="loc_lkq_SeniorUnsecuredCreditAgreementRevolvingCreditFacilitiesMember_019c8b5b-28cf-7564-99cb-0f08ad4b01a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SeniorUnsecuredTermLoanCreditAgreementCADNoteMember_019c8b5b-28cf-739c-9231-71dd903711be" xlink:href="lkq-20260331.xsd#lkq_SeniorUnsecuredTermLoanCreditAgreementCADNoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7946-9e50-bd9fa7a68eba" xlink:to="loc_lkq_SeniorUnsecuredTermLoanCreditAgreementCADNoteMember_019c8b5b-28cf-739c-9231-71dd903711be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_U.S.Notes2028Member_019c8b5b-28cf-708e-a123-541f4c29b270" xlink:href="lkq-20260331.xsd#lkq_U.S.Notes2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7946-9e50-bd9fa7a68eba" xlink:to="loc_lkq_U.S.Notes2028Member_019c8b5b-28cf-708e-a123-541f4c29b270" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_USNotes2033Member_019c8b5b-28cf-7826-a5ec-6baeaabc476b" xlink:href="lkq-20260331.xsd#lkq_USNotes2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7946-9e50-bd9fa7a68eba" xlink:to="loc_lkq_USNotes2033Member_019c8b5b-28cf-7826-a5ec-6baeaabc476b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuroNotes2024Member_019c8b5b-28cf-7d9f-995c-52d5e8228768" xlink:href="lkq-20260331.xsd#lkq_EuroNotes2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7946-9e50-bd9fa7a68eba" xlink:to="loc_lkq_EuroNotes2024Member_019c8b5b-28cf-7d9f-995c-52d5e8228768" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuroNotes2028Member_019c8b5b-28cf-70ce-ba4c-3d3b3a3a221f" xlink:href="lkq-20260331.xsd#lkq_EuroNotes2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7946-9e50-bd9fa7a68eba" xlink:to="loc_lkq_EuroNotes2028Member_019c8b5b-28cf-70ce-ba4c-3d3b3a3a221f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuroNotes2031Member_019c8b5b-28cf-72ce-ad03-a3fe6155b570" xlink:href="lkq-20260331.xsd#lkq_EuroNotes2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7946-9e50-bd9fa7a68eba" xlink:to="loc_lkq_EuroNotes2031Member_019c8b5b-28cf-72ce-ad03-a3fe6155b570" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_BorrowingsUnderCreditFacility_019c8b5b-28cf-7087-94c0-b7ad1d0d9c6b" xlink:href="lkq-20260331.xsd#lkq_BorrowingsUnderCreditFacility"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisLineItems_019c8b5b-28cf-7a91-883c-cd6eeef0c147" xlink:to="loc_lkq_BorrowingsUnderCreditFacility_019c8b5b-28cf-7087-94c0-b7ad1d0d9c6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt_019c8b5b-28cf-77fb-9fcd-49e3c5c2a2a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisLineItems_019c8b5b-28cf-7a91-883c-cd6eeef0c147" xlink:to="loc_us-gaap_UnsecuredDebt_019c8b5b-28cf-77fb-9fcd-49e3c5c2a2a1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/FairValueDisclosureofAssetandLiabilityNotMeasuredatFairValueDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#FairValueDisclosureofAssetandLiabilityNotMeasuredatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/FairValueDisclosureofAssetandLiabilityNotMeasuredatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ClassificationLineItems_019c8b5b-28cf-77c2-bd2f-8bb0ad01f897" xlink:href="lkq-20260331.xsd#lkq_ClassificationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ClassificationTable_019c8b5b-28cf-7404-b4b4-c58f91f7ca19" xlink:href="lkq-20260331.xsd#lkq_ClassificationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lkq_ClassificationLineItems_019c8b5b-28cf-77c2-bd2f-8bb0ad01f897" xlink:to="loc_lkq_ClassificationTable_019c8b5b-28cf-7404-b4b4-c58f91f7ca19" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-28cf-7869-9024-0caff803e7d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ClassificationTable_019c8b5b-28cf-7404-b4b4-c58f91f7ca19" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-28cf-7869-9024-0caff803e7d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7869-9024-0caff803e7d8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-28cf-7869-9024-0caff803e7d8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7869-9024-0caff803e7d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7c22-a102-81abf32a0624" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c8b5b-28cf-7869-9024-0caff803e7d8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7c22-a102-81abf32a0624" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_U.S.Notes2028Member_019c8b5b-28cf-7758-9ca4-5824f7041f02" xlink:href="lkq-20260331.xsd#lkq_U.S.Notes2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7c22-a102-81abf32a0624" xlink:to="loc_lkq_U.S.Notes2028Member_019c8b5b-28cf-7758-9ca4-5824f7041f02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_USNotes2033Member_019c8b5b-28cf-7653-8fa1-09a8a8f53066" xlink:href="lkq-20260331.xsd#lkq_USNotes2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7c22-a102-81abf32a0624" xlink:to="loc_lkq_USNotes2033Member_019c8b5b-28cf-7653-8fa1-09a8a8f53066" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuroNotes2028Member_019c8b5b-28cf-72b4-bf55-4be64ad0e2d0" xlink:href="lkq-20260331.xsd#lkq_EuroNotes2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7c22-a102-81abf32a0624" xlink:to="loc_lkq_EuroNotes2028Member_019c8b5b-28cf-72b4-bf55-4be64ad0e2d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuroNotes2031Member_019c8b5b-28cf-77ed-aef2-4a237a1c3df0" xlink:href="lkq-20260331.xsd#lkq_EuroNotes2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c8b5b-28cf-7c22-a102-81abf32a0624" xlink:to="loc_lkq_EuroNotes2031Member_019c8b5b-28cf-77ed-aef2-4a237a1c3df0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019c8b5b-28cf-76af-bf04-7e808e157bf8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ClassificationLineItems_019c8b5b-28cf-77c2-bd2f-8bb0ad01f897" xlink:to="loc_us-gaap_LongTermDebt_019c8b5b-28cf-76af-bf04-7e808e157bf8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019c8b5b-28cf-738c-9402-bd4548b7f78a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ClassificationLineItems_019c8b5b-28cf-77c2-bd2f-8bb0ad01f897" xlink:to="loc_us-gaap_LongTermDebtFairValue_019c8b5b-28cf-738c-9402-bd4548b7f78a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/CashCashEquivalentsandRestrictedCashDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#CashCashEquivalentsandRestrictedCashDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/CashCashEquivalentsandRestrictedCashDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019c8b5b-28cf-7990-b862-bb7726c63e7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_019c8b5b-28cf-7381-8d93-acd4cd239378" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019c8b5b-28cf-7990-b862-bb7726c63e7b" xlink:to="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_019c8b5b-28cf-7381-8d93-acd4cd239378" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c8b5b-28cf-7ea3-9770-1a5c89693a53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019c8b5b-28cf-7990-b862-bb7726c63e7b" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c8b5b-28cf-7ea3-9770-1a5c89693a53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndInvestmentsNoncurrent_019c8b5b-28cf-738a-a2fb-b1a47216b06c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndInvestmentsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019c8b5b-28cf-7990-b862-bb7726c63e7b" xlink:to="loc_us-gaap_RestrictedCashAndInvestmentsNoncurrent_019c8b5b-28cf-738a-a2fb-b1a47216b06c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c8b5b-28cf-704b-beb6-40c52cfb6538" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_019c8b5b-28cf-7990-b862-bb7726c63e7b" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c8b5b-28cf-704b-beb6-40c52cfb6538" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/SegmentandGeographicInformationAdditionalInformationDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#SegmentandGeographicInformationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/SegmentandGeographicInformationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7f3d-8090-16e7d49b0e8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7090-a4b1-d0f35f5eba5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7f3d-8090-16e7d49b0e8a" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7090-a4b1-d0f35f5eba5b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7ae8-be6f-adf8446eb329" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7090-a4b1-d0f35f5eba5b" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7ae8-be6f-adf8446eb329" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-7ae8-be6f-adf8446eb329_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7ae8-be6f-adf8446eb329" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-7ae8-be6f-adf8446eb329_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-71bd-84de-686c85da853d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7ae8-be6f-adf8446eb329" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-71bd-84de-686c85da853d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7593-a17a-1ee7b8602be8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7090-a4b1-d0f35f5eba5b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7593-a17a-1ee7b8602be8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7593-a17a-1ee7b8602be8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7593-a17a-1ee7b8602be8" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7593-a17a-1ee7b8602be8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7374-9bff-1789a7393337" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7593-a17a-1ee7b8602be8" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7374-9bff-1789a7393337" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-70a2-a5b3-80a71b535a0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7090-a4b1-d0f35f5eba5b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-70a2-a5b3-80a71b535a0e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28cf-70a2-a5b3-80a71b535a0e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-70a2-a5b3-80a71b535a0e" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28cf-70a2-a5b3-80a71b535a0e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7633-80ee-271b0bd4a2a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-70a2-a5b3-80a71b535a0e" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7633-80ee-271b0bd4a2a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_NorthAmericaSegmentMember_019dded8-64c6-7bdb-ad6e-db577a093b63" xlink:href="lkq-20260331.xsd#lkq_NorthAmericaSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7633-80ee-271b0bd4a2a8" xlink:to="loc_lkq_NorthAmericaSegmentMember_019dded8-64c6-7bdb-ad6e-db577a093b63" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuropeSegmentMember_019c8b5b-28cf-7e2e-8694-bae80ef00533" xlink:href="lkq-20260331.xsd#lkq_EuropeSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7633-80ee-271b0bd4a2a8" xlink:to="loc_lkq_EuropeSegmentMember_019c8b5b-28cf-7e2e-8694-bae80ef00533" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SpecialtyMember_019c8b5b-28cf-7107-bd5b-5e7d4057a78e" xlink:href="lkq-20260331.xsd#lkq_SpecialtyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7633-80ee-271b0bd4a2a8" xlink:to="loc_lkq_SpecialtyMember_019c8b5b-28cf-7107-bd5b-5e7d4057a78e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SelfServiceSegmentMember_019c8b5b-28cf-7a38-9c27-a856d4ca87d7" xlink:href="lkq-20260331.xsd#lkq_SelfServiceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7633-80ee-271b0bd4a2a8" xlink:to="loc_lkq_SelfServiceSegmentMember_019c8b5b-28cf-7a38-9c27-a856d4ca87d7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_UsGaap_IntersegmentEliminationMemberMember_019c8b5b-28cf-7fcf-ae3c-593a481740ed" xlink:href="lkq-20260331.xsd#lkq_UsGaap_IntersegmentEliminationMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7633-80ee-271b0bd4a2a8" xlink:to="loc_lkq_UsGaap_IntersegmentEliminationMemberMember_019c8b5b-28cf-7fcf-ae3c-593a481740ed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ConsolidatedExcludingDiscontinuedOperationsMember_019c8b5b-28cf-7d00-baaf-2f6a078c4fdd" xlink:href="lkq-20260331.xsd#lkq_ConsolidatedExcludingDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7633-80ee-271b0bd4a2a8" xlink:to="loc_lkq_ConsolidatedExcludingDiscontinuedOperationsMember_019c8b5b-28cf-7d00-baaf-2f6a078c4fdd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019c8b5b-28cf-7477-896f-fe0ea3a4e1b1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7090-a4b1-d0f35f5eba5b" xlink:to="loc_srt_MajorCustomersAxis_019c8b5b-28cf-7477-896f-fe0ea3a4e1b1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019c8b5b-28cf-7477-896f-fe0ea3a4e1b1_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019c8b5b-28cf-7477-896f-fe0ea3a4e1b1" xlink:to="loc_srt_NameOfMajorCustomerDomain_019c8b5b-28cf-7477-896f-fe0ea3a4e1b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019c8b5b-28cf-79ba-9bfa-1fc0b52ea49a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019c8b5b-28cf-7477-896f-fe0ea3a4e1b1" xlink:to="loc_srt_NameOfMajorCustomerDomain_019c8b5b-28cf-79ba-9bfa-1fc0b52ea49a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ThirdPartyMember_019c8b5b-28cf-7fe2-a2f7-be4ad4e889e3" xlink:href="lkq-20260331.xsd#lkq_ThirdPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019c8b5b-28cf-79ba-9bfa-1fc0b52ea49a" xlink:to="loc_lkq_ThirdPartyMember_019c8b5b-28cf-7fe2-a2f7-be4ad4e889e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_IntersegmentMember_019c8b5b-28cf-7734-9cc5-5925d0354b15" xlink:href="lkq-20260331.xsd#lkq_IntersegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019c8b5b-28cf-79ba-9bfa-1fc0b52ea49a" xlink:to="loc_lkq_IntersegmentMember_019c8b5b-28cf-7734-9cc5-5925d0354b15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c8b5b-28cf-7fee-b7d1-caff975dcc73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7f3d-8090-16e7d49b0e8a" xlink:to="loc_us-gaap_Revenues_019c8b5b-28cf-7fee-b7d1-caff975dcc73" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019c8b5b-28cf-7665-8f6a-4e39feffde86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7f3d-8090-16e7d49b0e8a" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019c8b5b-28cf-7665-8f6a-4e39feffde86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019c8b5b-28cf-7d6c-9bbf-2e8d312f7562" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7f3d-8090-16e7d49b0e8a" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019c8b5b-28cf-7d6c-9bbf-2e8d312f7562" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019c8b5b-28cf-766c-930c-ca39547c2e59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7f3d-8090-16e7d49b0e8a" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019c8b5b-28cf-766c-930c-ca39547c2e59" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SegmentEBITDA_019c8b5b-28cf-77f7-9613-cd784c70c42f" xlink:href="lkq-20260331.xsd#lkq_SegmentEBITDA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7f3d-8090-16e7d49b0e8a" xlink:to="loc_lkq_SegmentEBITDA_019c8b5b-28cf-77f7-9613-cd784c70c42f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019c8b5b-28cf-798e-94a1-2b0fde1d6b9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7f3d-8090-16e7d49b0e8a" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019c8b5b-28cf-798e-94a1-2b0fde1d6b9e" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/ReconciliationOfNetIncometoSegmentEBITDADetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#ReconciliationOfNetIncometoSegmentEBITDADetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/ReconciliationOfNetIncometoSegmentEBITDADetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:href="lkq-20260331.xsd#lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTableTable_019c8b5b-28cf-7ee4-a70b-ba8899729954" xlink:href="lkq-20260331.xsd#lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTableTable_019c8b5b-28cf-7ee4-a70b-ba8899729954" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7698-8528-4bc0a1c5e583" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTableTable_019c8b5b-28cf-7ee4-a70b-ba8899729954" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7698-8528-4bc0a1c5e583" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7698-8528-4bc0a1c5e583_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7698-8528-4bc0a1c5e583" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-7698-8528-4bc0a1c5e583_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-703e-b23b-2fa663be50d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c8b5b-28cf-7698-8528-4bc0a1c5e583" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c8b5b-28cf-703e-b23b-2fa663be50d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7968-837d-9eb6a3460b7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTableTable_019c8b5b-28cf-7ee4-a70b-ba8899729954" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7968-837d-9eb6a3460b7b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-7968-837d-9eb6a3460b7b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7968-837d-9eb6a3460b7b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-7968-837d-9eb6a3460b7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-743c-b0e4-7f93c80e8040" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c8b5b-28cf-7968-837d-9eb6a3460b7b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c8b5b-28cf-743c-b0e4-7f93c80e8040" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019c8b5b-28cf-7a08-9768-860deb90ab73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTableTable_019c8b5b-28cf-7ee4-a70b-ba8899729954" xlink:to="loc_us-gaap_InvestmentTypeAxis_019c8b5b-28cf-7a08-9768-860deb90ab73" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019c8b5b-28cf-7a08-9768-860deb90ab73_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019c8b5b-28cf-7a08-9768-860deb90ab73" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019c8b5b-28cf-7a08-9768-860deb90ab73_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019c8b5b-28cf-79e2-abe3-b58fcc9bff1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019c8b5b-28cf-7a08-9768-860deb90ab73" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019c8b5b-28cf-79e2-abe3-b58fcc9bff1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-750a-a8db-0cf4caed714a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTableTable_019c8b5b-28cf-7ee4-a70b-ba8899729954" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-750a-a8db-0cf4caed714a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-750a-a8db-0cf4caed714a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-750a-a8db-0cf4caed714a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-750a-a8db-0cf4caed714a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7185-b3e3-f5b6a8b322b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c8b5b-28cf-750a-a8db-0cf4caed714a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7185-b3e3-f5b6a8b322b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForwardContractsMember_019c8b5b-28cf-7150-8212-cc29272354c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForwardContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c8b5b-28cf-7185-b3e3-f5b6a8b322b8" xlink:to="loc_us-gaap_ForwardContractsMember_019c8b5b-28cf-7150-8212-cc29272354c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-7b89-a7b4-88bda0a28bd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTableTable_019c8b5b-28cf-7ee4-a70b-ba8899729954" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-7b89-a7b4-88bda0a28bd9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7b89-a7b4-88bda0a28bd9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-7b89-a7b4-88bda0a28bd9" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7b89-a7b4-88bda0a28bd9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7151-bed3-8b66ce10e8a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-7b89-a7b4-88bda0a28bd9" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7151-bed3-8b66ce10e8a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ConsolidatedExcludingDiscontinuedOperationsMember_019c8b5b-28cf-7d17-9aea-82b4ac634a61" xlink:href="lkq-20260331.xsd#lkq_ConsolidatedExcludingDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7151-bed3-8b66ce10e8a6" xlink:to="loc_lkq_ConsolidatedExcludingDiscontinuedOperationsMember_019c8b5b-28cf-7d17-9aea-82b4ac634a61" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019c8b5b-28cf-7c05-8649-1e3df5fdb298" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_us-gaap_ProfitLoss_019c8b5b-28cf-7c05-8649-1e3df5fdb298" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity_019c8b5b-28cf-7e33-a685-e1c0c6dd6e8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity_019c8b5b-28cf-7e33-a685-e1c0c6dd6e8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_NetIncomeAttributableToLKQStockholders_019c8b5b-28cf-791f-b6ab-b8a32f1c788f" xlink:href="lkq-20260331.xsd#lkq_NetIncomeAttributableToLKQStockholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_lkq_NetIncomeAttributableToLKQStockholders_019c8b5b-28cf-791f-b6ab-b8a32f1c788f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_019c8b5b-28cf-7e2c-a879-3ce3ad33f415" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_019c8b5b-28cf-7e2c-a879-3ce3ad33f415" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_019c8b5b-28cf-75ba-808b-dec8afd279c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_019c8b5b-28cf-75ba-808b-dec8afd279c6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_019c8b5b-28cf-7d56-952e-475aeb43f3fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_019c8b5b-28cf-7d56-952e-475aeb43f3fc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019c8b5b-28cf-731e-8ca3-07840cc96abc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019c8b5b-28cf-731e-8ca3-07840cc96abc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019c8b5b-28cf-79d3-beb4-56d6266c9170" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019c8b5b-28cf-79d3-beb4-56d6266c9170" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019c8b5b-28cf-760c-b51c-9ebabbb4dc53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019c8b5b-28cf-760c-b51c-9ebabbb4dc53" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019c8b5b-28cf-79e3-b3d3-38fb4423f2ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019c8b5b-28cf-79e3-b3d3-38fb4423f2ad" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestments_019c8b5b-28cf-7e60-8be3-422ec4382765" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrealizedGainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_us-gaap_UnrealizedGainLossOnInvestments_019c8b5b-28cf-7e60-8be3-422ec4382765" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_RestructuringChargesAndBusinessCombinationAcquisitionRelatedCosts_019c8b5b-28cf-7a5b-a983-9da0ddbefdd7" xlink:href="lkq-20260331.xsd#lkq_RestructuringChargesAndBusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_lkq_RestructuringChargesAndBusinessCombinationAcquisitionRelatedCosts_019c8b5b-28cf-7a5b-a983-9da0ddbefdd7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_RestructuringExpensesCostOfGoodsSold_019c8b5b-28cf-7fd0-b942-096995ccc293" xlink:href="lkq-20260331.xsd#lkq_RestructuringExpensesCostOfGoodsSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_lkq_RestructuringExpensesCostOfGoodsSold_019c8b5b-28cf-7fd0-b942-096995ccc293" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_GainLossesOnPreviouslyHeldEquityInterests_019c8b5b-28cf-7392-87dd-ab48def3fe6b" xlink:href="lkq-20260331.xsd#lkq_GainLossesOnPreviouslyHeldEquityInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_lkq_GainLossesOnPreviouslyHeldEquityInterests_019c8b5b-28cf-7392-87dd-ab48def3fe6b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_DirectImpactsOfUkraineRussiaConflict_019c8b5b-28cf-72f1-9241-193bb3bad92c" xlink:href="lkq-20260331.xsd#lkq_DirectImpactsOfUkraineRussiaConflict"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_lkq_DirectImpactsOfUkraineRussiaConflict_019c8b5b-28cf-72f1-9241-193bb3bad92c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SegmentEBITDA_019c8b5b-28cf-713a-948c-a30382451078" xlink:href="lkq-20260331.xsd#lkq_SegmentEBITDA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lkq_ReconciliationofSegmentEarningsBeforeInterestTaxesDepreciationAndAmortizationtoNetIncomeTablLineItems_019c8b5b-28cf-7e00-92ce-841d065b257a" xlink:to="loc_lkq_SegmentEBITDA_019c8b5b-28cf-713a-948c-a30382451078" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-721f-94c3-3753fbde9bf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-701c-8436-7cc698bb1346" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-721f-94c3-3753fbde9bf6" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-701c-8436-7cc698bb1346" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-7af9-be7c-73aefc915634" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-701c-8436-7cc698bb1346" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-7af9-be7c-73aefc915634" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7af9-be7c-73aefc915634_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28cf-791f-9d6e-21da352ecbf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ConsolidatedExcludingDiscontinuedOperationsMember_019c8b5b-28cf-7d11-a232-58a26155e6d3" xlink:href="lkq-20260331.xsd#lkq_ConsolidatedExcludingDiscontinuedOperationsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019c8b5b-28cf-7e19-89c8-3ecdc0d86d77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-721f-94c3-3753fbde9bf6" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019c8b5b-28cf-7e19-89c8-3ecdc0d86d77" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/ScheduleofCapitalExpendituresbyReportableSegmentDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#ScheduleofCapitalExpendituresbyReportableSegmentDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/ScheduleofCapitalExpendituresbyReportableSegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-78f9-b49f-c62a271c9a13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7ef0-aba8-990dff2db6a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-78f9-b49f-c62a271c9a13" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7ef0-aba8-990dff2db6a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019c8b5b-28cf-71f9-9e5c-c23130fce8fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7ef0-aba8-990dff2db6a7" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019c8b5b-28cf-71f9-9e5c-c23130fce8fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019c8b5b-28cf-71f9-9e5c-c23130fce8fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019c8b5b-28cf-71f9-9e5c-c23130fce8fe" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019c8b5b-28cf-71f9-9e5c-c23130fce8fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019c8b5b-28cf-7761-8ee0-422d901aaea3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019c8b5b-28cf-71f9-9e5c-c23130fce8fe" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019c8b5b-28cf-7761-8ee0-422d901aaea3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-78f6-a584-c6f82bb351e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7ef0-aba8-990dff2db6a7" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-78f6-a584-c6f82bb351e3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28cf-78f6-a584-c6f82bb351e3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-78f6-a584-c6f82bb351e3" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28cf-78f6-a584-c6f82bb351e3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7471-b0df-a1d3b61f6c60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-78f6-a584-c6f82bb351e3" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7471-b0df-a1d3b61f6c60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_NorthAmericaSegmentMember_019dded8-a726-77ba-95b2-11f0f3747634" xlink:href="lkq-20260331.xsd#lkq_NorthAmericaSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7471-b0df-a1d3b61f6c60" xlink:to="loc_lkq_NorthAmericaSegmentMember_019dded8-a726-77ba-95b2-11f0f3747634" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuropeSegmentMember_019c8b5b-28cf-736f-8a99-38f48982f32d" xlink:href="lkq-20260331.xsd#lkq_EuropeSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7471-b0df-a1d3b61f6c60" xlink:to="loc_lkq_EuropeSegmentMember_019c8b5b-28cf-736f-8a99-38f48982f32d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SpecialtyMember_019c8b5b-28cf-70a6-9577-5286e060e57c" xlink:href="lkq-20260331.xsd#lkq_SpecialtyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7471-b0df-a1d3b61f6c60" xlink:to="loc_lkq_SpecialtyMember_019c8b5b-28cf-70a6-9577-5286e060e57c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_ConsolidatedExcludingDiscontinuedOperationsMember_019c8b5b-28cf-7c0b-8759-a18a1279f29b" xlink:href="lkq-20260331.xsd#lkq_ConsolidatedExcludingDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7471-b0df-a1d3b61f6c60" xlink:to="loc_lkq_ConsolidatedExcludingDiscontinuedOperationsMember_019c8b5b-28cf-7c0b-8759-a18a1279f29b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_019c8b5b-28cf-70f5-9cd6-d5eb791c2691" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-78f9-b49f-c62a271c9a13" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_019c8b5b-28cf-70f5-9cd6-d5eb791c2691" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/ScheduleofAssetsbyReportableSegmentDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#ScheduleofAssetsbyReportableSegmentDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/ScheduleofAssetsbyReportableSegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7872-8e6b-fa0d1aeead1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7d3a-a5b5-19e2aadd882d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7872-8e6b-fa0d1aeead1c" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7d3a-a5b5-19e2aadd882d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-735c-aea7-2a88a07c36c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7d3a-a5b5-19e2aadd882d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-735c-aea7-2a88a07c36c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28cf-735c-aea7-2a88a07c36c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-735c-aea7-2a88a07c36c5" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28cf-735c-aea7-2a88a07c36c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7ee8-800e-d35a23aa108f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c8b5b-28cf-735c-aea7-2a88a07c36c5" xlink:to="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7ee8-800e-d35a23aa108f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_NorthAmericaSegmentMember_019dded8-dff8-7cdd-b000-e9b314397f95" xlink:href="lkq-20260331.xsd#lkq_NorthAmericaSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7ee8-800e-d35a23aa108f" xlink:to="loc_lkq_NorthAmericaSegmentMember_019dded8-dff8-7cdd-b000-e9b314397f95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuropeSegmentMember_019c8b5b-28cf-7034-9950-ce5e10cb855d" xlink:href="lkq-20260331.xsd#lkq_EuropeSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7ee8-800e-d35a23aa108f" xlink:to="loc_lkq_EuropeSegmentMember_019c8b5b-28cf-7034-9950-ce5e10cb855d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SpecialtyMember_019c8b5b-28cf-7816-b3b6-15e947015731" xlink:href="lkq-20260331.xsd#lkq_SpecialtyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7ee8-800e-d35a23aa108f" xlink:to="loc_lkq_SpecialtyMember_019c8b5b-28cf-7816-b3b6-15e947015731" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_SelfServiceSegmentMember_019c8b5b-28cf-7511-a4ed-e3394303d341" xlink:href="lkq-20260331.xsd#lkq_SelfServiceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c8b5b-28cf-7ee8-800e-d35a23aa108f" xlink:to="loc_lkq_SelfServiceSegmentMember_019c8b5b-28cf-7511-a4ed-e3394303d341" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_019c8b5b-28cf-7dd1-948a-bc60de233510" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7872-8e6b-fa0d1aeead1c" xlink:to="loc_us-gaap_ReceivablesNetCurrent_019c8b5b-28cf-7dd1-948a-bc60de233510" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_019c8b5b-28cf-71dc-bc1a-7b2dfa9121ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7872-8e6b-fa0d1aeead1c" xlink:to="loc_us-gaap_InventoryNet_019c8b5b-28cf-71dc-bc1a-7b2dfa9121ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019c8b5b-28cf-73be-994a-bf10286cb654" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7872-8e6b-fa0d1aeead1c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019c8b5b-28cf-73be-994a-bf10286cb654" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019c8b5b-28cf-71c4-a041-d90637b92839" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7872-8e6b-fa0d1aeead1c" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019c8b5b-28cf-71c4-a041-d90637b92839" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_OtherUnallocatedAssets_019c8b5b-28cf-768b-b300-f16df1eb6d86" xlink:href="lkq-20260331.xsd#lkq_OtherUnallocatedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7872-8e6b-fa0d1aeead1c" xlink:to="loc_lkq_OtherUnallocatedAssets_019c8b5b-28cf-768b-b300-f16df1eb6d86" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019c8b5b-28cf-7e43-b8bd-e91264f2d44f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c8b5b-28cf-7872-8e6b-fa0d1aeead1c" xlink:to="loc_us-gaap_Assets_019c8b5b-28cf-7e43-b8bd-e91264f2d44f" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lkqcorp.com/role/ScheduleofTangibleLongLivedAssetsbyGeographicAreaDetails" xlink:type="simple" xlink:href="lkq-20260331.xsd#ScheduleofTangibleLongLivedAssetsbyGeographicAreaDetails"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/ScheduleofTangibleLongLivedAssetsbyGeographicAreaDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019c8b5b-28cf-7604-9bd1-09964b624254" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7284-8869-7b4a32373acd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019c8b5b-28cf-7604-9bd1-09964b624254" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7284-8869-7b4a32373acd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c8b5b-28cf-781e-bf81-1c2a45a216c7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c8b5b-28cf-7284-8869-7b4a32373acd" xlink:to="loc_srt_StatementGeographicalAxis_019c8b5b-28cf-781e-bf81-1c2a45a216c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-781e-bf81-1c2a45a216c7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c8b5b-28cf-781e-bf81-1c2a45a216c7" xlink:to="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-781e-bf81-1c2a45a216c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-76b0-b161-d13d650d8e54" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c8b5b-28cf-781e-bf81-1c2a45a216c7" xlink:to="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-76b0-b161-d13d650d8e54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019c8b5b-28cf-7100-b564-45b139c2a403" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-76b0-b161-d13d650d8e54" xlink:to="loc_country_US_019c8b5b-28cf-7100-b564-45b139c2a403" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_DE_019c8b5b-28cf-79ef-8bf4-4ec8e4b75c7c" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_DE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-76b0-b161-d13d650d8e54" xlink:to="loc_country_DE_019c8b5b-28cf-79ef-8bf4-4ec8e4b75c7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_019c8b5b-28cf-7542-b519-c6d797f4182a" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-76b0-b161-d13d650d8e54" xlink:to="loc_country_GB_019c8b5b-28cf-7542-b519-c6d797f4182a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_OtherCountriesMember_019c8b5b-28cf-77aa-9800-a63ffbe57eb1" xlink:href="lkq-20260331.xsd#lkq_OtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c8b5b-28cf-76b0-b161-d13d650d8e54" xlink:to="loc_lkq_OtherCountriesMember_019c8b5b-28cf-77aa-9800-a63ffbe57eb1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_019c8b5b-28cf-7d85-8259-fba734d39574" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019c8b5b-28cf-7604-9bd1-09964b624254" xlink:to="loc_us-gaap_NoncurrentAssets_019c8b5b-28cf-7d85-8259-fba734d39574" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>