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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-10-06</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000819539</issuerCik>
        <issuerName>NEIMAN MARCUS GROUP INC</issuerName>
        <issuerTradingSymbol>NMG.B</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001313070</rptOwnerCik>
            <rptOwnerName>Marks Nancy Lurie</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O MARK D. BALK, GOULSTON &amp; STORRS, PC</rptOwnerStreet1>
            <rptOwnerStreet2>400 ATLANTIC AVENUE</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Member of Schedule 13D group</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-10-06</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>U</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2301145</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>100</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>see footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Reflects shares disposed of purusant to the Agreement and Plan of Merger, dated May 1, 2005, among The Neiman Marcus Group, Inc., Newton Acquisition, Inc. and Newton Acquisition Merger Sub, Inc. that are held directly by the following persons or entities and indirectly by the reporting person:  86,991 shares held by Marian Realty Company of which the reporting person beneficially owns 50% of the stock; 974,134 shares held by the Trust U/W Philip Smith for the benefit of Richard A. Smith; 974,134 shares held by the Trust U/W Philip Smith for the benefit of Nancy L. Marks; 30,074 shares held by the Peter A. Lurie Trust for the benefit of Peter A. Lurie, the son of the reporting person;</footnote>
        <footnote id="F2">59,669 shares held by the Morris J. Lurie Family Trust for the benefit of Cathy J. Lurie; 59,669 shares held by the Morris J. Lurie Family Trust for the benefit for Peter A. Lurie; 48,208 shares held by the Marian Smith J-C-P 1976 Trust for the benefit of Cathy J. Lurie; 48,208 shares held by the Marian Smith J-C-P 1976 Trust for the benefit of Peter A. Lurie; and 20,058 shares held by Richard A. Smith Trust U/W/O Marian J. Smith fbo Debra Smith Knez.  The reporting person disclaims beneficial ownership of 1,240,020 of these shares, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Mark D. Balk, Attorney-in-Fact</signatureName>
        <signatureDate>2005-10-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
