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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001016317-06-000004.txt : 20060119
<SEC-HEADER>0001016317-06-000004.hdr.sgml : 20060119
<ACCEPTANCE-DATETIME>20060119170123
ACCESSION NUMBER:		0001016317-06-000004
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060117
FILED AS OF DATE:		20060119
DATE AS OF CHANGE:		20060119

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BAGLEY JAMES W
		CENTRAL INDEX KEY:			0001016317

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-12933
		FILM NUMBER:		06538777

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		510 572 0200

	MAIL ADDRESS:	
		STREET 1:		LAM RESEARCH
		STREET 2:		4650 CUSHING PARKWAY
		CITY:			FREMONT
		STATE:			CA
		ZIP:			94538

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LAM RESEARCH CORP
		CENTRAL INDEX KEY:			0000707549
		STANDARD INDUSTRIAL CLASSIFICATION:	SPECIAL INDUSTRY MACHINERY, NEC [3559]
		IRS NUMBER:				942634797
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		4650 CUSHING BLVD
		CITY:			FREMONT
		STATE:			CA
		ZIP:			94538
		BUSINESS PHONE:		5106590200

	MAIL ADDRESS:	
		STREET 1:		4650 CUSHING PARKWAY
		CITY:			FREMONT
		STATE:			CA
		ZIP:			94538
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
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    <schemaVersion>X0202</schemaVersion>

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    <periodOfReport>2006-01-17</periodOfReport>

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        <issuerName>LAM RESEARCH CORP</issuerName>
        <issuerTradingSymbol>LRCX</issuerTradingSymbol>
    </issuer>

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            <rptOwnerName>BAGLEY JAMES W</rptOwnerName>
        </reportingOwnerId>
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            <rptOwnerStreet1>LAM RESEARCH</rptOwnerStreet1>
            <rptOwnerStreet2>4650 CUSHING PARKWAY</rptOwnerStreet2>
            <rptOwnerCity>FREMONT</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94538</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive Chairman</officerTitle>
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            <transactionDate>
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            <deemedExecutionDate>
                <value>2006-01-18</value>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>5000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>38</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <securityTitle>
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            <transactionDate>
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            <deemedExecutionDate>
                <value>2006-01-19</value>
            </deemedExecutionDate>
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            <transactionTimeliness>
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            <transactionAmounts>
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                    <value>40000</value>
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            <deemedExecutionDate>
                <value>2006-01-19</value>
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    <derivativeTable>
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            </securityTitle>
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                <value>2006-01-17</value>
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                </transactionShares>
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    <footnotes>
        <footnote id="F1">Shares were 100% vested as of 3/1/02.</footnote>
        <footnote id="F2">Shares sold pursuant to 10b5-1 Plan.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Kym Hall by Power of Attorney</signatureName>
        <signatureDate>2006-01-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----