<SEC-DOCUMENT>0001104659-18-037523-index.html : 20180601
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<ACCEPTANCE-DATETIME>20180601142221
ACCESSION NUMBER:		0001104659-18-037523
CONFORMED SUBMISSION TYPE:	N-CSRS
PUBLIC DOCUMENT COUNT:		15
CONFORMED PERIOD OF REPORT:	20180331
FILED AS OF DATE:		20180601
DATE AS OF CHANGE:		20180601
EFFECTIVENESS DATE:		20180601

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-CSRS
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-06565
		FILM NUMBER:		18874548

	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
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Document 1 - file: a18-12504_2ncsrs.htm

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Document 6 - file: j18125041_aa002.jpg

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Document 7 - file: j18125041_aa003.jpg

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Document 9 - file: j18125041_ba005.jpg

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Document 10 - file: j18125041_ba006.jpg

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Document 13 - file: j18125041_ba009.jpg

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Document 14 - file: j18125041_ba010.jpg

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