<SUBMISSION>
<ACCESSION-NUMBER>0001126975-03-000005
<TYPE>3
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20031212
<FILING-DATE>20031216
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>OBRIEN GEORGE A
<CIK>0001200174
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>001-16335
<FILM-NUMBER>031057607
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>C/O INTERNATIONAL PAPER
<STREET2>400 ATLANTIC STREET
<CITY>STAMFORD
<STATE>CT
<ZIP>06921
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>MAGELLAN MIDSTREAM PARTNERS LP
<CIK>0001126975
<ASSIGNED-SIC>4610
<IRS-NUMBER>731599053
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>P O BOX 22186
<CITY>TULSA
<STATE>OK
<ZIP>74121-2186
<PHONE>918 574 7000
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>ONE WILLIAMS CENTER
<CITY>TULSA
<STATE>OK
<ZIP>74172
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>WILLIAMS ENERGY PARTNERS L P
<DATE-CHANGED>20001024
</FORMER-COMPANY>
</ISSUER>
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<DESCRIPTION>PRIMARY DOCUMENT
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<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>3</documentType><periodOfReport>2003-12-12</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001126975</issuerCik>
        <issuerName>MAGELLAN MIDSTREAM PARTNERS LP</issuerName>
        <issuerTradingSymbol>MMP</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001200174</rptOwnerCik>
            <rptOwnerName>OBRIEN GEORGE A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INTERNATIONAL PAPER</rptOwnerStreet1>
            <rptOwnerStreet2>400 ATLANTIC STREET</rptOwnerStreet2>
            <rptOwnerCity>STAMFORD</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06921</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeHolding><securityTitle><value>Common Units</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>0</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></nonDerivativeHolding></nonDerivativeTable><footnotes/><remarks/><ownerSignature><signatureName>George A. O'Brien</signatureName><signatureDate>2003-12-16</signatureDate></ownerSignature></ownershipDocument>

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</TEXT>
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