<SEC-DOCUMENT>0001104659-19-070186-index.html : 20191205
<SEC-HEADER>0001104659-19-070186.hdr.sgml : 20191205
<ACCEPTANCE-DATETIME>20191205153712
ACCESSION NUMBER:		0001104659-19-070186
CONFORMED SUBMISSION TYPE:	N-CSR
PUBLIC DOCUMENT COUNT:		13
CONFORMED PERIOD OF REPORT:	20190930
FILED AS OF DATE:		20191205
DATE AS OF CHANGE:		20191205
EFFECTIVENESS DATE:		20191205

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TEKLA LIFE SCIENCES INVESTORS
		CENTRAL INDEX KEY:			0000884121
		IRS NUMBER:				043147016
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			0930

	FILING VALUES:
		FORM TYPE:		N-CSR
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-06565
		FILM NUMBER:		191270344

	BUSINESS ADDRESS:	
		STREET 1:		100 FEDERAL STREET
		STREET 2:		19TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
		BUSINESS PHONE:		6177728515

	MAIL ADDRESS:	
		STREET 1:		100 FEDERAL STREET
		STREET 2:		19TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	H&Q LIFE SCIENCES INVESTORS
		DATE OF NAME CHANGE:	19920929
</SEC-HEADER>
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<TYPE>N-CSR
<SEQUENCE>1
<FILENAME>a19-18279_1ncsr.htm
<DESCRIPTION>CERTIFIED ANNUAL SHAREHOLDER REPORT
<TEXT>
Document 1 - file: a19-18279_1ncsr.htm

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<DOCUMENT>
<TYPE>EX-99.CODEETH
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<FILENAME>a19-18279_1ex99dcodeeth.htm
<DESCRIPTION>EX-99.CODEETH
<TEXT>
Document 2 - file: a19-18279_1ex99dcodeeth.htm

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<DOCUMENT>
<TYPE>EX-99.CERT
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<FILENAME>a19-18279_1ex99dcert.htm
<DESCRIPTION>EX-99.CERT
<TEXT>
Document 3 - file: a19-18279_1ex99dcert.htm

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<DOCUMENT>
<TYPE>EX-99.SECTION 19(A)
<SEQUENCE>4
<FILENAME>a19-18279_1ex99dsection19a.htm
<DESCRIPTION>EX-99.SECTION 19(A)
<TEXT>
Document 4 - file: a19-18279_1ex99dsection19a.htm

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<DESCRIPTION>EX-99.906CERT
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Document 5 - file: a19-18279_1ex99d906cert.htm

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<FILENAME>j19182792_aa001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: j19182792_aa001.jpg

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<FILENAME>j19182792_aa002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: j19182792_aa002.jpg

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Document 8 - file: j19182792_aa003.jpg

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<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: j19182792_ba004.jpg

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<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: j19182792_ba005.jpg

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Document 11 - file: j19182792_ba006.jpg

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Document 12 - file: j19182792_ba007.jpg

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<TYPE>GRAPHIC
<SEQUENCE>13
<FILENAME>j19182792_ba008.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 13 - file: j19182792_ba008.jpg

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