<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-04-28</periodOfReport>

    <issuer>
        <issuerCik>0001144967</issuerCik>
        <issuerName>HDFC BANK LTD</issuerName>
        <issuerTradingSymbol>HDB</issuerTradingSymbol>
        <issuerForeignTradingSymbol>HDFCBANK</issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002113174</rptOwnerCik>
            <rptOwnerName>Parthasarthy Ashish</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>true</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>HDFC BANK LIMITED, BANK HOUSE</rptOwnerStreet1>
            <rptOwnerStreet2>SENAPATI BAPAT MARG, LOWER PAREL</rptOwnerStreet2>
            <rptOwnerCity>MUMBAI</rptOwnerCity>
            <rptOwnerNonUSStateTerritory>INDIA</rptOwnerNonUSStateTerritory>
            <rptOwnerCountry>K7</rptOwnerCountry>
            <rptOwnerZipCode>400013</rptOwnerZipCode>
            <rptOwnerStateDescription>INDIA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>Group Head - Treasury</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>false</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Equity Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2026-04-28</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>5600</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>8.70</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>842958</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Conversion rate as on April 28, 2026 applied : 1Re = 0.011 USD</footnote>
    </footnotes>

    <remarks>The equity shares of the Bank are listed on NSE and BSE. The Trading symbol of NSE is HDFCBANK and is mentioned in the form under Foreign Trading Symbol. The Foreign Trading Symbol of BSE is 500180
Group Head - Treasury</remarks>

    <ownerSignature>
        <signatureName>/s/ Dhanjit Thaivalappil, Attorney in fact for Parthasarthy Ashish</signatureName>
        <signatureDate>2026-04-30</signatureDate>
    </ownerSignature>
</ownershipDocument>