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

    <schemaVersion>X0205</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2012-05-03</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001527166</issuerCik>
        <issuerName>Carlyle Group L.P.</issuerName>
        <issuerTradingSymbol>CG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001512671</rptOwnerCik>
            <rptOwnerName>Youngkin Glenn A.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1001 PENNSYLVANIA AVENUE, NW</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Operating Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Carlyle Holdings partnership units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Units representing limited partnership interests</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5528231</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Carlyle Holdings partnership units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Units representing limited partnership interests</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>142857</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Pursuant to the terms of the exchange agreement and subject to certain requirements and  restrictions, the partnership units of Carlyle Holdings are exchangeable for common units of The Carlyle Group L.P. on a one-for-one basis, from and after the first anniversary date of the closing of the offering.</footnote>
        <footnote id="F2">Such Carlyle Holdings partnership units are held by a trust for the benefit of the Reporting Person's family.  The Reporting Person is the special purpose trustee of the trust and has sole investment power over the units.</footnote>
    </footnotes>

    <remarks>Pursuant to Rule 16a-1(a)(4) of the Securities Exchange Act of 1934, as amended, the Reporting Person herein states that this filing shall not be deemed to be an admission that he or it is the beneficial owner of any of these interests, and disclaims beneficial ownership of such interests, except to the extent of his pecuniary interest in such interests.</remarks>

    <ownerSignature>
        <signatureName>/s/ Jeffrey W. Ferguson, General Counsel of The Carlyle Group L.P., by power of attorney for Glenn A. Youngkin</signatureName>
        <signatureDate>2012-05-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
