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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2016-11-02</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001404912</issuerCik>
        <issuerName>KKR &amp; Co. L.P.</issuerName>
        <issuerTradingSymbol>KKR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001433005</rptOwnerCik>
            <rptOwnerName>Janetschek William J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O KKR &amp; CO. L.P., 9 WEST 57TH STREET,</rptOwnerStreet1>
            <rptOwnerStreet2>42ND FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK,</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10019</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Financial Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>KKR Holdings L.P. Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2016-11-02</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>550000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Units</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>550000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3720827</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Pursuant to an exchange agreement as contemplated by KKR &amp; Co. L.P.'s prospectus dated September 21, 2011, filed with the Securities and Exchange Commission on September 23, 2011, units of KKR Holdings L.P. are exchangeable for KKR Group Partnership Units (which term refers collectively to Class A partner interests in each of KKR Management Holdings L.P., KKR Fund Holdings L.P. and KKR International Holdings L.P.) on a one-for-one basis, and KKR Group Partnership Units are exchangeable for common units of KKR &amp; Co. L.P. on a one-for-one basis.</footnote>
        <footnote id="F2">As previously reported in a Form 4 filed on February 25, 2016, these units of KKR Holdings L.P. were previously granted to the Reporting Person in connection with his service to the company.  On November 2, 2016, the board of directors of the general partner of KKR &amp; Co. L.P. consented to a modification to such units, and such units were modified by the general partner of KKR Holdings L.P. to eliminate the market price vesting condition and modify the service-based vesting schedule, to provide that the units will vest in equal annual installments beginning on May 1, 2017 and ending May 1, 2021, subject to the Reporting Person's continued service through the applicable vesting dates.</footnote>
        <footnote id="F3">These units will vest in equal annual installments beginning on May 1, 2017 and ending May 1, 2021, subject to the Reporting Person's continued service through the applicable vesting dates.</footnote>
    </footnotes>

    <remarks>The Reporting Person states that this filing shall not be deemed an admission that, for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise, that the transaction reported herein was subject to Section 16 of the Securities Exchange Act of 1934.</remarks>

    <ownerSignature>
        <signatureName>/s/ Christopher Lee, as Attorney-in-Fact</signatureName>
        <signatureDate>2016-11-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
