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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001224995-05-000009.txt : 20050401
<SEC-HEADER>0001224995-05-000009.hdr.sgml : 20050401
<ACCEPTANCE-DATETIME>20050401201808
ACCESSION NUMBER:		0001224995-05-000009
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050331
FILED AS OF DATE:		20050401
DATE AS OF CHANGE:		20050401

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			DEBARR ROBERT
		CENTRAL INDEX KEY:			0001224996

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-06453
		FILM NUMBER:		05727283

	BUSINESS ADDRESS:	
		STREET 1:		C/O NATIONAL SEMICONDUCTOR
		STREET 2:		2900 SEMICONDUCTOR DRIVE
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95051
		BUSINESS PHONE:		4087213127

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NATIONAL SEMICONDUCTOR CORP
		CENTRAL INDEX KEY:			0000070530
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				952095071
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0531

	BUSINESS ADDRESS:	
		STREET 1:		2900 SEMICONDUCTOR DR
		STREET 2:		PO BOX 58090
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95052-8090
		BUSINESS PHONE:		4087215000

	MAIL ADDRESS:	
		STREET 1:		2900 SEMICONDUCTOR DR
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95052-8090
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-03-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000070530</issuerCik>
        <issuerName>NATIONAL SEMICONDUCTOR CORP</issuerName>
        <issuerTradingSymbol>NSM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001224996</rptOwnerCik>
            <rptOwnerName>DEBARR ROBERT</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>STOCK ADMINISTRATION, MAIL STOP C1-640</rptOwnerStreet1>
            <rptOwnerStreet2>2900 SEMICONDUCTOR DR.</rptOwnerStreet2>
            <rptOwnerCity>SANTA CLARA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95051</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Controller</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-03-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>363.0145</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>15.13</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>363.0145</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1638</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>by Trust</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>338.405</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>by Trust.</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Automatic purchase of shares under Company's Employees Stock Purchase Plan, which is exempt under Rule 16b-3 (c).</footnote>
    </footnotes>

    <remarks>The nature of the indirect beneficial ownership shown in item 7 on Table 1 is shares held by the Company's Retirement and Savings Program.  As of May 30, 2004, the 2004 fiscal year end, based on unitized valuations provided by the Plan Trustee, 1,638 shares contributed by the Company to Mr. DeBarr's Profit Sharing Plan account were fully vested. Shares contributed to the Plan by the Company are exempt under Rule 16b-3(c).  Share amounts will vary based on unitized values provided by the Plan Trustee.  The Company has ceased to make contributions of NSC stock to the Profit Sharing Plan. Further,
as of the FY 2004 fiscal year of May 30, 2004, based on unitized valuations provided by the Plan Trustee, 338.405 shares of NSC stock had been acquired under the NSC Stock Fund in the Company's Savings Plus 401(k) Plan of the Retirement and Savings Program for the benefit of Mr. DeBarr.  These acquisitions are exempt as Discretionary Transactions under Rule 16b-3(f).  Share amounts will vary based on unitized values provided by the Plan Trustee and changes in share amounts do not necessarily represent dispositions or acquisitions made by Mr. DeBarr in the Savings Plus 401(k) Plan. Mr. DeBarr has not made any dispositions in the NSC Stock Fund and has ceased acquiring shares in the NSC Stock with payroll deductions.</remarks>

    <ownerSignature>
        <signatureName>By: Nancy Lucke Ludgus, Attorney-in-Fact  For: Robert DeBarr</signatureName>
        <signatureDate>2005-04-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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