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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-12-22</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0002013807</issuerCik>
        <issuerName>Foxx Development Holdings Inc.</issuerName>
        <issuerTradingSymbol>FOXX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002039252</rptOwnerCik>
            <rptOwnerName>Miao Yiqing</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>I/C/O FOXX DEVELOPMENT INC.</rptOwnerStreet1>
            <rptOwnerStreet2>15375 BARRANCA PARKWAY, SUITE C-106</rptOwnerStreet2>
            <rptOwnerCity>IRVINE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92618</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <remarks>On December 22, 2025, Ms. Miao's service as director of the Company terminated upon the election of a successor to her position at the annual meeting of stockholders of the issuer on the same date.</remarks>

    <ownerSignature>
        <signatureName>/s/ Yiqing Miao</signatureName>
        <signatureDate>2026-01-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
