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

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2009-07-09</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000831001</issuerCik>
        <issuerName>CITIGROUP INC</issuerName>
        <issuerTradingSymbol>C</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001195069</rptOwnerCik>
            <rptOwnerName>MCQUADE EUGENE M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>CITIGROUP INC., CORPORATE LAW DEPT.</rptOwnerStreet1>
            <rptOwnerStreet2>425 PARK AVENUE, 2ND FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10043</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CEO, Citibank, N.A.</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1500</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Trust</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <remarks>On July 9, 2009, Citigroup Inc. announced that the Reporting Person had been appointed Chief Executive Officer of Citibank, N.A., the Issuer's primary banking subsidiary.  Mr. McQuade is expected to commence employment on or about August 1, 2009.</remarks>

    <ownerSignature>
        <signatureName>Eugene McQuade by Joseph B. Wollard, Attorney-in-Fact</signatureName>
        <signatureDate>2009-07-17</signatureDate>
    </ownerSignature>
</ownershipDocument>

