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<ACCEPTANCE-DATETIME>20241230100637
ACCESSION NUMBER:		0001133228-24-011663
CONFORMED SUBMISSION TYPE:	N-CSR
PUBLIC DOCUMENT COUNT:		38
CONFORMED PERIOD OF REPORT:	20241031
FILED AS OF DATE:		20241230
DATE AS OF CHANGE:		20241230
EFFECTIVENESS DATE:		20241230

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ALGER INSTITUTIONAL FUNDS
		CENTRAL INDEX KEY:			0000911415
		ORGANIZATION NAME:           	
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		N-CSR
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-07986
		FILM NUMBER:		241587262

	BUSINESS ADDRESS:	
		STREET 1:		100 PEARL STREET
		STREET 2:		27TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10004
		BUSINESS PHONE:		212-806-8800

	MAIL ADDRESS:	
		STREET 1:		100 PEARL STREET
		STREET 2:		27TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10004

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALGER INSTITUTIONAL FUND
		DATE OF NAME CHANGE:	20020228

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALGER RETIREMENT FUND
		DATE OF NAME CHANGE:	19960515

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALGER DEFINED CONTRIBUTION TRUST
		DATE OF NAME CHANGE:	19930830
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<SERIES>
<OWNER-CIK>0000911415
<SERIES-ID>S000009201
<SERIES-NAME>Alger Focus Equity Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024998
<CLASS-CONTRACT-NAME>Alger Focus Equity Fund Class I
<CLASS-CONTRACT-TICKER-SYMBOL>ALGRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122071
<CLASS-CONTRACT-NAME>Alger Focus Equity Fund Class A
<CLASS-CONTRACT-TICKER-SYMBOL>ALAFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122072
<CLASS-CONTRACT-NAME>Alger Focus Equity Fund Class C
<CLASS-CONTRACT-TICKER-SYMBOL>ALCFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122073
<CLASS-CONTRACT-NAME>Alger Focus Equity Fund Class Z
<CLASS-CONTRACT-TICKER-SYMBOL>ALZFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000179522
<CLASS-CONTRACT-NAME>Alger Focus Equity Fund Class Y
<CLASS-CONTRACT-TICKER-SYMBOL>ALGYX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000911415
<SERIES-ID>S000009202
<SERIES-NAME>Alger Small Cap Growth Institutional Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000025000
<CLASS-CONTRACT-NAME>Alger Small Cap Growth Institutional Fund Class I
<CLASS-CONTRACT-TICKER-SYMBOL>ALSRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000025001
<CLASS-CONTRACT-NAME>Alger Small Cap Growth Institutional Fund Class R
<CLASS-CONTRACT-TICKER-SYMBOL>ASIRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000172687
<CLASS-CONTRACT-NAME>Alger Small Cap Growth Institutional Fund Class Z-2
<CLASS-CONTRACT-TICKER-SYMBOL>AISZX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000911415
<SERIES-ID>S000009203
<SERIES-NAME>Alger Mid Cap Growth Institutional Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000025002
<CLASS-CONTRACT-NAME>Alger Mid Cap Growth Institutional Fund Class I
<CLASS-CONTRACT-TICKER-SYMBOL>ALMRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000025003
<CLASS-CONTRACT-NAME>Alger Mid Cap Growth Institutional Fund Class R
<CLASS-CONTRACT-TICKER-SYMBOL>AGIRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000174228
<CLASS-CONTRACT-NAME>Alger Mid Cap Growth Institutional Fund Class Z-2
<CLASS-CONTRACT-TICKER-SYMBOL>ALMZX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000911415
<SERIES-ID>S000009204
<SERIES-NAME>Alger Capital Appreciation Institutional Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000025004
<CLASS-CONTRACT-NAME>Alger Capital Appreciation Institutional Fund Class I
<CLASS-CONTRACT-TICKER-SYMBOL>ALARX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000025005
<CLASS-CONTRACT-NAME>Alger Capital Appreciation Institutional Fund Class R
<CLASS-CONTRACT-TICKER-SYMBOL>ACARX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000174229
<CLASS-CONTRACT-NAME>Alger Capital Appreciation Institutional Fund Class Z-2
<CLASS-CONTRACT-TICKER-SYMBOL>ACIZX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000179523
<CLASS-CONTRACT-NAME>Alger Capital Appreciation Institutional Fund Class Y
<CLASS-CONTRACT-TICKER-SYMBOL>ACAYX
</CLASS-CONTRACT>
</SERIES>
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</SERIES-AND-CLASSES-CONTRACTS-DATA>
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<DOCUMENT>
<TYPE>N-CSR
<SEQUENCE>1
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<DESCRIPTION>THE ALGER INSTITUTIONAL FUNDS - NCSR
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<TYPE>EX-99.CERT
<SEQUENCE>3
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