-----BEGIN PRIVACY-ENHANCED MESSAGE-----
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,
 Vhjhq6kSGtrIQygkAI2D/2u80TBH412CxrXnbqZ5gKpzGAtRyD6q1d/4om9UzlKX
 Yuv+MdmbSThuaAnIYpsEcQ==

<SEC-DOCUMENT>0001209191-03-033831.txt : 20031205
<SEC-HEADER>0001209191-03-033831.hdr.sgml : 20031205
<ACCEPTANCE-DATETIME>20031205154314
ACCESSION NUMBER:		0001209191-03-033831
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031204
FILED AS OF DATE:		20031205

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KEITHLEY INSTRUMENTS INC
		CENTRAL INDEX KEY:			0000054991
		STANDARD INDUSTRIAL CLASSIFICATION:	INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS [3825]
		IRS NUMBER:				340794417
		STATE OF INCORPORATION:			OH
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		28775 AURORA RD
		CITY:			SOLON
		STATE:			OH
		ZIP:			44139
		BUSINESS PHONE:		2162480400

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ROSICA GABRIEL A
		CENTRAL INDEX KEY:			0001198928

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09965
		FILM NUMBER:		031040449

	BUSINESS ADDRESS:	
		STREET 1:		28775 AURORA ROAD
		CITY:			CLEVELAND
		STATE:			OH
		ZIP:			44139
		BUSINESS PHONE:		4404982680

	MAIL ADDRESS:	
		STREET 1:		28775 AURORA ROAD
		CITY:			CLEVELAND
		STATE:			OH
		ZIP:			44139
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?><ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-12-04</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0000054991</issuerCik><issuerName>KEITHLEY INSTRUMENTS INC</issuerName>        <issuerTradingSymbol>KEI</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001198928</rptOwnerCik><rptOwnerName>ROSICA GABRIEL A</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>KEITHLEY INSTRUMENTS, INC.</rptOwnerStreet1><rptOwnerStreet2>28775 AURORA ROAD</rptOwnerStreet2><rptOwnerCity>SOLON</rptOwnerCity><rptOwnerState>OH</rptOwnerState><rptOwnerZipCode>44139</rptOwnerZipCode><rptOwnerStateDescription></rptOwnerStateDescription></reportingOwnerAddress><reportingOwnerRelationship><isDirector>0</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>Executive Vice President</officerTitle></reportingOwnerRelatio
nship></reportingOwner><derivativeTable><derivativeHolding><securityTitle><value>Common Stock Option</value></securityTitle><conversionOrExercisePrice><value>5.7188</value></conversionOrExercisePrice><exerciseDate><value>1999-09-20</value></exerciseDate><expirationDate><value>2007-09-19</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stk</value></underlyingSecurityTitle><underlyingSecurityShares><value>12500.0000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>12500.0000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Common Stock Option</value></securityTitle><conversionOrExercisePrice><value>2.5313</value></conversionOrExercisePrice><exerciseDate><value>2000-09-12</value></exerciseDate><expirationDate><value>2008-09-11</
value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stk</value></underlyingSecurityTitle><underlyingSecurityShares><value>21000.0000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>21000.0000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Common Stock Option</value></securityTitle><conversionOrExercisePrice><value>3.8125</value></conversionOrExercisePrice><exerciseDate><value>2001-02-14</value></exerciseDate><expirationDate><value>2009-02-13</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stk</value></underlyingSecurityTitle><underlyingSecurityShares><value>30000.0000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>30000.0
000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Common Stock Option</value></securityTitle><conversionOrExercisePrice><value>4.1250</value></conversionOrExercisePrice><exerciseDate><value>2001-07-17</value></exerciseDate><expirationDate><value>2009-07-16</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stk</value></underlyingSecurityTitle><underlyingSecurityShares><value>58000.0000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>58000.0000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Common Stock Option</value></securityTitle><conversi
onOrExercisePrice><value>45.1250</value></conversionOrExercisePrice><exerciseDate><value>2002-08-02</value><footnoteId id="F1" /></exerciseDate><expirationDate><value>2010-08-01</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stk</value></underlyingSecurityTitle><underlyingSecurityShares><value>55000.0000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>55000.0000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Common Stock Option</value></securityTitle><conversionOrExercisePrice><value>18.4100</value></conversionOrExercisePrice><exerciseDate><value>2003-07-25</value></exerciseDate><expirationDate><value>2006-07-25</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stk</value></underlyingSecu
rityTitle><underlyingSecurityShares><value>60000.0000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>60000.0000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Common Stock Option</value></securityTitle><conversionOrExercisePrice><value>13.7600</value></conversionOrExercisePrice><exerciseDate><value>2004-07-24</value></exerciseDate><expirationDate><value>2012-07-23</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stk</value></underlyingSecurityTitle><underlyingSecurityShares><value>30000.0000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>30000.0000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwne
rship><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeHolding><derivativeTransaction><securityTitle><value>Phantom Stock Units</value></securityTitle><conversionOrExercisePrice><value>17.0492</value></conversionOrExercisePrice><transactionDate><value>2003-12-04</value></transactionDate><deemedExecutionDate></deemedExecutionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>3.9900</value></transactionShares><transactionPricePerShare><value>0</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>2005-09-09</value></exerciseDate><expirationDate><value>2005-09-09</value><footnoteId id="F2" /></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Commo
n Stk</value></underlyingSecurityTitle><underlyingSecurityShares><value>3.9900</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>1820.2700</value><footnoteId id="F3" /></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeTransaction></derivativeTable><footnotes><footnote id="F1">Date reported applies to 50% of total, one-half of the balance is then exercisable in each succeeding year.</footnote><footnote id="F2">The phantom stock units were accrued under the Keithley Instruments, Inc. Deferred Stock Plan and are to be settled in common stock to the reporting person upon the exercisable date.</footnote><footnote id="F3">Phantom shares were acquired on various dates (beginning 09/19/1995) with prices ranging from $2.469 to $64.00</footnote></footnotes><remarks></remarks><ownerSignature><signatureName>Mark J. Plush, Attor
ney-in Fact</signatureName><signatureDate>2003-12-05</signatureDate></ownerSignature></ownershipDocument>

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