-----BEGIN PRIVACY-ENHANCED MESSAGE-----
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>0001249817-08-000064.txt : 20080902
<SEC-HEADER>0001249817-08-000064.hdr.sgml : 20080901
<ACCEPTANCE-DATETIME>20080902181231
ACCESSION NUMBER:		0001249817-08-000064
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080828
FILED AS OF DATE:		20080902
DATE AS OF CHANGE:		20080902

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			QLOGIC CORP
		CENTRAL INDEX KEY:			0000918386
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				330537669
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0328

	BUSINESS ADDRESS:	
		STREET 1:		26650 LAGUNA HILLS DR
		CITY:			ALLISO VIEJO
		STATE:			CA
		ZIP:			92656
		BUSINESS PHONE:		7144382200

	MAIL ADDRESS:	
		STREET 1:		26650 LAGUNA HILLS DR
		CITY:			ALLISO VIEJO
		STATE:			CA
		ZIP:			92656

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Q LOGIC CORP
		DATE OF NAME CHANGE:	19940201

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			IYER BALAKRISHNAN S
		CENTRAL INDEX KEY:			0001185812

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-23298
		FILM NUMBER:		081052313

	BUSINESS ADDRESS:	
		STREET 1:		4311 JAMBOREE RD
		CITY:			NEWPORT BEACH
		STATE:			CA
		ZIP:			92660
		BUSINESS PHONE:		9494834383

	MAIL ADDRESS:	
		STREET 1:		5221 CALIFORNIA AVE.
		CITY:			IRVINE
		STATE:			CA
		ZIP:			92617
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-08-28</periodOfReport>

    <issuer>
        <issuerCik>0000918386</issuerCik>
        <issuerName>QLOGIC CORP</issuerName>
        <issuerTradingSymbol>QLGC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001185812</rptOwnerCik>
            <rptOwnerName>IYER BALAKRISHNAN S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>26650 ALISO VIEJO PARKWAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ALISO VIEJO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92656</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-08-28</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1754</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1754</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1754</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Options (Right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>19.02</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-08-28</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>9057</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-08-28</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9057</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9057</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each restricted stock unit represents a contingent right to receive one share of QLogic common stock.</footnote>
        <footnote id="F2">The restricted stock units vest in three equal annual installments beginning approximately one year from the date of grant. Each year's vesting date will be the earlier of (i) the day prior to the annual meeting of the Corporation's stockholders or (ii) the anniversary of the date of grant.</footnote>
        <footnote id="F3">Exercisable in three equal annual installments beginning approximately one year from the date of grant. Each year's vesting date will be the earlier of (i) the day prior to the annual meeting of the Corporation's stockholders or (ii) the anniversary of the date of grant.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Michael L. Hawkins as Attorney-In-Fact for Balakrishnan Iyer</signatureName>
        <signatureDate>2008-09-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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