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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 G8374O0oUm/XJv5rpKGdr+rRd40EXuiyc+BjbI9Ao1TWxzhPMBeyldNkPQCJAY6e
 eWTATy0/fS/t2oRvb2Xvrw==

<SEC-DOCUMENT>0001140361-08-016328.txt : 20080702
<SEC-HEADER>0001140361-08-016328.hdr.sgml : 20080702
<ACCEPTANCE-DATETIME>20080702141912
ACCESSION NUMBER:		0001140361-08-016328
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080701
FILED AS OF DATE:		20080702
DATE AS OF CHANGE:		20080702

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LSI INDUSTRIES INC
		CENTRAL INDEX KEY:			0000763532
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC LIGHTING & WIRING EQUIPMENT [3640]
		IRS NUMBER:				310888951
		STATE OF INCORPORATION:			OH
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		10000 ALLIANCE RD
		STREET 2:		P O BOX 42728
		CITY:			CINCINNATI
		STATE:			OH
		ZIP:			45242
		BUSINESS PHONE:		5135796411

	MAIL ADDRESS:	
		STREET 1:		10000 ALLIANCE RD
		STREET 2:		P O BOX 42728
		CITY:			CINCINNATI
		STATE:			OH
		ZIP:			45242

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	LSI LIGHTING SYSTEMS INC
		DATE OF NAME CHANGE:	19891121

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			OGARA WILFRED T
		CENTRAL INDEX KEY:			0001206600

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-13375
		FILM NUMBER:		08933202

	BUSINESS ADDRESS:	
		STREET 1:		C/O LSI INDUSTRIES INC
		STREET 2:		10000 ALLIANCE ROAD
		CITY:			CINCINNATI
		STATE:			OH
		ZIP:			45242
		BUSINESS PHONE:		5137933200

	MAIL ADDRESS:	
		STREET 1:		8180 CORPORATE PARK DRIVE
		STREET 2:		SUITE 301
		CITY:			CINCINNATI
		STATE:			OH
		ZIP:			45242
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-07-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000763532</issuerCik>
        <issuerName>LSI INDUSTRIES INC</issuerName>
        <issuerTradingSymbol>LYTS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001206600</rptOwnerCik>
            <rptOwnerName>OGARA WILFRED T</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>8180 CORPORATE PARK DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 301</rptOwnerStreet2>
            <rptOwnerCity>CINCINNATI</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>45242</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2008-07-01</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>320</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>7.81</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6259</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Mark A. Weiss, Attorney-in-Fact for Wilfred T. O'Gara</signatureName>
        <signatureDate>2008-07-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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