<SEC-DOCUMENT>0001104659-20-070287-index.html : 20200605
<SEC-HEADER>0001104659-20-070287.hdr.sgml : 20200605
<ACCEPTANCE-DATETIME>20200605160220
ACCESSION NUMBER:		0001104659-20-070287
CONFORMED SUBMISSION TYPE:	N-CSRS
PUBLIC DOCUMENT COUNT:		12
CONFORMED PERIOD OF REPORT:	20200331
FILED AS OF DATE:		20200605
DATE AS OF CHANGE:		20200605
EFFECTIVENESS DATE:		20200605

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:		20946108

	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>
<DOCUMENT>
<TYPE>N-CSRS
<SEQUENCE>1
<FILENAME>tm2017901-1_ncsrs.htm
<DESCRIPTION>N-CSRS
<TEXT>
Document 1 - file: tm2017901-1_ncsrs.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>2
<FILENAME>tm2017901d1_ex99cert.htm
<DESCRIPTION>EXHIBIT 99.CERT
<TEXT>
Document 2 - file: tm2017901d1_ex99cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.SECTION19(A)
<SEQUENCE>3
<FILENAME>tm2017901d1_ex99section19a.htm
<DESCRIPTION>EXHIBIT 99.SECTION19(A)
<TEXT>
Document 3 - file: tm2017901d1_ex99section19a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.906 CERT
<SEQUENCE>4
<FILENAME>tm2017901d1_ex99-906cert.htm
<DESCRIPTION>EXHIBIT 99.906 CERT
<TEXT>
Document 4 - file: tm2017901d1_ex99-906cert.htm

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<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>j20179012_aa001.jpg
<DESCRIPTION>GRAPHIC
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Document 5 - file: j20179012_aa001.jpg

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<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>j20179012_aa002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: j20179012_aa002.jpg

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<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>j20179012_aa003.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: j20179012_aa003.jpg

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<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>j20179012_ba004.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: j20179012_ba004.jpg

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<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>j20179012_ba005.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: j20179012_ba005.jpg

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<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>j20179012_ba006.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: j20179012_ba006.jpg

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<TYPE>GRAPHIC
<SEQUENCE>11
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<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: j20179012_ba007.jpg

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<TYPE>GRAPHIC
<SEQUENCE>12
<FILENAME>j20179012_ba008.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 12 - file: j20179012_ba008.jpg

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