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

    <schemaVersion>X0708</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0002117553</cik>
        <entityName>Rallyday Partners Fund III LP</entityName>
        <issuerAddress>
            <street1>Rallyday Partners Fund III GP LLC</street1>
            <street2>250 Fillmore Street, Suite 225</street2>
            <city>Denver</city>
            <stateOrCountry>CO</stateOrCountry>
            <stateOrCountryDescription>COLORADO</stateOrCountryDescription>
            <zipCode>80206</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>720-738-7814</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2026</value>
        </yearOfInc>
    </primaryIssuer>

    <issuerList>
        <issuer>
            <cik>0002117549</cik>
            <entityName>Rallyday Partners Fund III-A LP</entityName>
            <issuerAddress>
                <street1>Rallyday Partners Fund III GP LLC</street1>
                <street2>250 Fillmore Street, Suite 225</street2>
                <city>Denver</city>
                <stateOrCountry>CO</stateOrCountry>
                <stateOrCountryDescription>COLORADO</stateOrCountryDescription>
                <zipCode>80206</zipCode>
            </issuerAddress>
            <issuerPhoneNumber>720-738-7814</issuerPhoneNumber>
            <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
            <edgarPreviousNameList>
                <value>None</value>
            </edgarPreviousNameList>
            <entityType>Limited Partnership</entityType>
            <yearOfInc>
                <withinFiveYears>true</withinFiveYears>
                <value>2026</value>
            </yearOfInc>
        </issuer>
    </issuerList>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Ryan</firstName>
                <lastName>Heckman</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Rallyday Partners Fund III LP</street1>
                <street2>250 Fillmore Street, Suite 225</street2>
                <city>Denver</city>
                <stateOrCountry>CO</stateOrCountry>
                <stateOrCountryDescription>COLORADO</stateOrCountryDescription>
                <zipCode>80206</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Manager of Rallyday Partners Management, LLC the &quot;Manager&quot; of the
Rallyday Partners Fund III GP LLC, the &quot;General Partner&quot; of the Issuers</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Nancy</firstName>
                <lastName>Phillips</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Rallyday Partners Fund III LP</street1>
                <street2>250 Fillmore Street, Suite 225</street2>
                <city>Denver</city>
                <stateOrCountry>CO</stateOrCountry>
                <stateOrCountryDescription>COLORADO</stateOrCountryDescription>
                <zipCode>80206</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Manager of the Manager of the General Partner of the Issuers</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Mark</firstName>
                <lastName>Hopkins</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Rallyday Partners Fund III LP</street1>
                <street2>250 Fillmore Street, Suite 225</street2>
                <city>Denver</city>
                <stateOrCountry>CO</stateOrCountry>
                <stateOrCountryDescription>COLORADO</stateOrCountryDescription>
                <zipCode>80206</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Manager of the Manager of the General Partner of the Issuers</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Private Equity Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
            <item>3C.1</item>
            <item>3C.7</item>
            <item>3C</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <yetToOccur>true</yetToOccur>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>75000</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>Atlantic-Pacific Capital, Inc.</recipientName>
                <recipientCRDNumber>000038356</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>One Dock Street</street1>
                    <street2>Suite 404</street2>
                    <city>Stamford</city>
                    <stateOrCountry>CT</stateOrCountry>
                    <stateOrCountryDescription>CONNECTICUT</stateOrCountryDescription>
                    <zipCode>06902</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <value>All States</value>
                </statesOfSolicitationList>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>300000000</totalOfferingAmount>
            <totalAmountSold>0</totalAmountSold>
            <totalRemaining>300000000</totalRemaining>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>0</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>4000000</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse>The Mgmt Co. is entitled to reimbursement of its annual budget, which in the first fiscal year shall be the amount above, pursuant to the terms of the Issuer's partnership agreement. Such budget will include salaries paid to persons named in Item 3 above.</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Rallyday Partners Fund III LP</issuerName>
                <signatureName>/s/ Ryan Heckman</signatureName>
                <nameOfSigner>Ryan Heckman</nameOfSigner>
                <signatureTitle>Manager of Manager of the General Partner of the Issuer</signatureTitle>
                <signatureDate>2026-03-19</signatureDate>
            </signature>
            <signature>
                <issuerName>Rallyday Partners Fund III-A LP</issuerName>
                <signatureName>/s/ Ryan Heckman</signatureName>
                <nameOfSigner>Ryan Heckman</nameOfSigner>
                <signatureTitle>Manager of Manager of the General Partner of the Issuer</signatureTitle>
                <signatureDate>2026-03-19</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
