-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 GA/EgIBloO9hBmwDUSFME50EKIqA7SKiM5qFb0vUSUCbEF44h6/6fYvhTERms96K
 W4Cs8DEHME4wJQfTK1/Dig==

<SEC-DOCUMENT>0001209191-03-033681.txt : 20031204
<SEC-HEADER>0001209191-03-033681.hdr.sgml : 20031204
<ACCEPTANCE-DATETIME>20031204170526
ACCESSION NUMBER:		0001209191-03-033681
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031204
FILED AS OF DATE:		20031204

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GRISWOLD JAMES B
		CENTRAL INDEX KEY:			0001198933

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09965
		FILM NUMBER:		031038433

	MAIL ADDRESS:	
		STREET 1:		BAKER & HOSTETLER LLP
		STREET 2:		3200 NATIONAL CITY CTR
		CITY:			CLEVELAND
		STATE:			OH
		ZIP:			44114

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
</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>0001198933</rptOwnerCik><rptOwnerName>GRISWOLD JAMES B</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>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDeriva
tiveHolding><securityTitle><value>Common Shares</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>6080.0000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeHolding></nonDerivativeTable><derivativeTable><derivativeHolding><securityTitle><value>Common Stock Option</value></securityTitle><conversionOrExercisePrice><value>4.4063</value></conversionOrExercisePrice><exerciseDate><value>1998-08-15</value></exerciseDate><expirationDate><value>2008-02-14</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stk</value></underlyingSecurityTitle><underlyingSecurityShares><value>7500.0000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>7500.0000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwner
ship><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Common Stock Option</value></securityTitle><conversionOrExercisePrice><value>36.8500</value></conversionOrExercisePrice><exerciseDate><value>2001-08-18</value></exerciseDate><expirationDate><value>2011-02-17</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stk</value></underlyingSecurityTitle><underlyingSecurityShares><value>10000.0000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>10000.0000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Common Stock Option</value></securityTitle><conversionOrExercisePrice><value>19.2300</value></conversionOrExercisePrice><exerciseDate><value>2002-08-17</value><
/exerciseDate><expirationDate><value>2012-02-16</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stk</value></underlyingSecurityTitle><underlyingSecurityShares><value>10000.0000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>10000.0000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Common Stock Option</value></securityTitle><conversionOrExercisePrice><value>10.7000</value></conversionOrExercisePrice><exerciseDate><value>2003-08-16</value></exerciseDate><expirationDate><value>2013-02-15</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stk</value></underlyingSecurityTitle><underlyingSecurityShares><value>10000.0000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmoun
ts><sharesOwnedFollowingTransaction><value>10000.0000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><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>276.1500</value></transactionShares><transactionPricePerShare><value>0</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><footnoteId id="F
1" /></exerciseDate><expirationDate><footnoteId id="F1" /></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stk</value></underlyingSecurityTitle><underlyingSecurityShares><value>276.1500</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>25871.8500</value><footnoteId id="F2" /></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeTransaction></derivativeTable><footnotes><footnote id="F1">The phantom stock units were accrued under the Keithley Instruments, Inc. Deferred Stock Plan and are to be settled in ten installments of common stock upon the retirement from the Board of the reporting person; retirement date is not yet known.</footnote><footnote id="F2">Phantom shares were acquired on various dates (beginning 09/19/1995) with prices ranging from $2.469 to $64.00.</footnote></footnotes><remark
s></remarks><ownerSignature><signatureName>Mark J. Plush, Attorney-in Fact</signatureName><signatureDate>2003-12-04</signatureDate></ownerSignature></ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----