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

    <schemaVersion>X0708</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001970149</cik>
        <entityName>Kearny Jackson Fund III, L.P.</entityName>
        <issuerAddress>
            <street1>2340 PACIFIC AVENUE, APT 306</street1>
            <city>SAN FRANCISCO</city>
            <stateOrCountry>CA</stateOrCountry>
            <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
            <zipCode>94115</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>781-266-8947</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <edgarPreviousNameList>
            <previousName>Kearny Jackson III, L.P.</previousName>
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        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2023</value>
        </yearOfInc>
    </primaryIssuer>

    <issuerList>
        <issuer>
            <cik>0001970143</cik>
            <entityName>Kearny Jackson Fund III-A, L.P.</entityName>
            <issuerAddress>
                <street1>2340 PACIFIC AVENUE, APT 306</street1>
                <city>SAN FRANCISCO</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94115</zipCode>
            </issuerAddress>
            <issuerPhoneNumber>781-266-8947</issuerPhoneNumber>
            <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
            <edgarPreviousNameList>
                <previousName>Kearny Jackson III-A, L.P.</previousName>
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            <entityType>Limited Partnership</entityType>
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                <value>2023</value>
            </yearOfInc>
        </issuer>
    </issuerList>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <lastName>Kearny Jackson Fund III GP, LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>3175 Hanover Street</street1>
                <city>Palo Alto</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94304</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General Partner of the Issuers</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Sriram</firstName>
                <lastName>Krishnan</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>3175 Hanover Street</street1>
                <city>Palo Alto</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94304</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Managing Director of the General Partner of the Issuers</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Sunil</firstName>
                <lastName>Chhaya</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>3175 Hanover Street</street1>
                <city>Palo Alto</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94304</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Managing Director of the General Partner of the Issuers</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Venture Capital Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
            <item>3C</item>
            <item>3C.1</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0001970149-23-000003</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2023-11-20</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>66761625</totalOfferingAmount>
            <totalAmountSold>66761625</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>114</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse>The General Partner or affiliates of the Issuer may receive a management fee as specified in the Issuer's partnership agreement.</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Kearny Jackson Fund III, L.P.</issuerName>
                <signatureName>/s/ Sunil Chhaya</signatureName>
                <nameOfSigner>Sunil Chhaya</nameOfSigner>
                <signatureTitle>Managing Director of General Partner of Issuer</signatureTitle>
                <signatureDate>2025-08-06</signatureDate>
            </signature>
            <signature>
                <issuerName>Kearny Jackson Fund III-A, L.P.</issuerName>
                <signatureName>/s/ Sunil Chhaya</signatureName>
                <nameOfSigner>Sunil Chhaya</nameOfSigner>
                <signatureTitle>Managing Director of General Partner of Issuer</signatureTitle>
                <signatureDate>2025-08-06</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
