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

    <schemaVersion>X0708</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0000821182</cik>
        <entityName>M ARTHUR GENSLER JR &amp; ASSOCIATES INC</entityName>
        <issuerAddress>
            <street1>220 MONTGOMERY STREET</street1>
            <street2>SUITE 200</street2>
            <city>SAN FRANCISCO</city>
            <stateOrCountry>CA</stateOrCountry>
            <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
            <zipCode>94104</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>(415) 433-3700</issuerPhoneNumber>
        <jurisdictionOfInc>CALIFORNIA</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Corporation</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Andrew</firstName>
                <middleName>P.</middleName>
                <lastName>Cohen</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 500 South Figueroa Street</street1>
                <city>Los Angeles</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>90071</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Diane</firstName>
                <lastName>Hoskins</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 2020 K Street</street1>
                <street2>Suite 200</street2>
                <city>Washington</city>
                <stateOrCountry>DC</stateOrCountry>
                <stateOrCountryDescription>DISTRICT OF COLUMBIA</stateOrCountryDescription>
                <zipCode>20006</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Joseph</firstName>
                <lastName>Brancato</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 1700 Broadway</street1>
                <street2>Suite 400</street2>
                <city>New York</city>
                <stateOrCountry>NY</stateOrCountry>
                <stateOrCountryDescription>NEW YORK</stateOrCountryDescription>
                <zipCode>10019</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Elizabeth</firstName>
                <lastName>Brink</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 500 South Figueroa Street</street1>
                <city>Los Angeles</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>90071</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Gregory</firstName>
                <lastName>Richart</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 500 South Figueroa Street</street1>
                <city>Los Angeles</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>90071</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jordan</firstName>
                <lastName>Goldstein</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 2020 K Street</street1>
                <street2>Suite 200</street2>
                <city>Washington</city>
                <stateOrCountry>DC</stateOrCountry>
                <stateOrCountryDescription>DISTRICT OF COLUMBIA</stateOrCountryDescription>
                <zipCode>20006</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Philippe</firstName>
                <lastName>Phaneuf</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 500 South Figueroa Street</street1>
                <city>Los Angeles</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>90071</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Ryan</firstName>
                <lastName>Alvarez</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 500 South Figueroa Street</street1>
                <city>Los Angeles</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>90071</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Yousif</firstName>
                <lastName>Yousif</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 500 South Figueroa Street</street1>
                <city>Los Angeles</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>90071</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Giuseppe</firstName>
                <lastName>Lauro</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 1700 Broadway</street1>
                <street2>Suite 400</street2>
                <city>New York</city>
                <stateOrCountry>NY</stateOrCountry>
                <stateOrCountryDescription>NEW YORK</stateOrCountryDescription>
                <zipCode>10019</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kenneth</firstName>
                <lastName>Baker</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 11 E. Madison St.</street1>
                <street2>Suite 300</street2>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60602</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Karen</firstName>
                <lastName>Thomas</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 1200 6th Ave.</street1>
                <city>Seattle</city>
                <stateOrCountry>WA</stateOrCountry>
                <stateOrCountryDescription>WASHINGTON</stateOrCountryDescription>
                <zipCode>98101</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jean</firstName>
                <middleName>Lee</middleName>
                <lastName>Anderson</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 1700 Broadway</street1>
                <street2>Suite 400</street2>
                <city>New York</city>
                <stateOrCountry>NY</stateOrCountry>
                <stateOrCountryDescription>NEW YORK</stateOrCountryDescription>
                <zipCode>10019</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Duncan</firstName>
                <lastName>Swinhoe</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 6 Thomas More Square</street1>
                <city>London</city>
                <stateOrCountry>X0</stateOrCountry>
                <stateOrCountryDescription>UNITED KINGDOM</stateOrCountryDescription>
                <zipCode>E1W 1YW</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Cynthia</firstName>
                <lastName>Simpson</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 5005 Greenville Ave.</street1>
                <city>Dallas</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>75206</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kevin</firstName>
                <lastName>Heinly</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Gensler, 225 Broadway</street1>
                <street2>#100</street2>
                <city>San Diego</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>92101</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Other</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2026-03-31</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>0</totalOfferingAmount>
            <totalAmountSold>0</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse>10,948 shares were issued in connection with employment.  No cash consideration was paid.  This offering was made in parallel with an offering under Rule 701.</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>141</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>M ARTHUR GENSLER JR &amp; ASSOCIATES INC</issuerName>
                <signatureName>/s/ Ryan Alvarez</signatureName>
                <nameOfSigner>Ryan Alvarez</nameOfSigner>
                <signatureTitle>Assistant Secretary</signatureTitle>
                <signatureDate>2026-04-14</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
