<SUBMISSION>
<ACCESSION-NUMBER>0001126975-19-000153
<TYPE>3
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20190901
<FILING-DATE>20190904
<DATE-OF-FILING-DATE-CHANGE>20190904
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>Pearson Michael C
<CIK>0001785469
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>001-16335
<FILM-NUMBER>191074133
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>ONE WILLIAMS CENTER
<STREET2>SUITE 2800
<CITY>TULSA
<STATE>OK
<ZIP>74172
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>Magellan Midstream Partners, L.P.
<CIK>0001126975
<ASSIGNED-SIC>4610
<IRS-NUMBER>731599053
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>ONE WILLIAMS CENTER, MD 28-1
<CITY>TULSA
<STATE>OK
<ZIP>74172
<PHONE>918 574 7000
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>ONE WILLIAMS CENTER, MD 28-1
<CITY>TULSA
<STATE>OK
<ZIP>74172
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>MAGELLAN MIDSTREAM PARTNERS, L.P.
<DATE-CHANGED>20190718
</FORMER-COMPANY>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>MAGELLAN MIDSTREAM PARTNERS LP
<DATE-CHANGED>20030827
</FORMER-COMPANY>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>WILLIAMS ENERGY PARTNERS L P
<DATE-CHANGED>20001024
</FORMER-COMPANY>
</ISSUER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>wf-form3_156762205478270.xml
<DESCRIPTION>FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2019-09-01</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001126975</issuerCik>
        <issuerName>Magellan Midstream Partners, L.P.</issuerName>
        <issuerTradingSymbol>MMP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001785469</rptOwnerCik>
            <rptOwnerName>Pearson Michael C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE WILLIAMS CENTER, SUITE 2800</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>TULSA</rptOwnerCity>
            <rptOwnerState>OK</rptOwnerState>
            <rptOwnerZipCode>74172</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Senior Vice President</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Units</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>62775</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Phantom Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2021-12-31</value>
            </exerciseDate>
            <expirationDate>
                <value>2021-12-31</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Units</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2766.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">One-for-One</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Michael C. Pearson</signatureName>
        <signatureDate>2019-09-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
