<SEC-DOCUMENT>0001193125-15-392708-index.html : 20151202
<SEC-HEADER>0001193125-15-392708.hdr.sgml : 20151202
<ACCEPTANCE-DATETIME>20151202093106
ACCESSION NUMBER:		0001193125-15-392708
CONFORMED SUBMISSION TYPE:	497
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20151202
DATE AS OF CHANGE:		20151202
EFFECTIVENESS DATE:		20151202

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COLUMBIA ACORN TRUST
		CENTRAL INDEX KEY:			0000002110
		IRS NUMBER:				362692100
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		497
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	002-34223
		FILM NUMBER:		151263682

	BUSINESS ADDRESS:	
		STREET 1:		227 W MONROE STE 3000
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606
		BUSINESS PHONE:		3126349200

	MAIL ADDRESS:	
		STREET 1:		227 W MONROE STE 3000
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	LIBERTY ACORN TRUST
		DATE OF NAME CHANGE:	20010424

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ACORN INVESTMENT TRUST
		DATE OF NAME CHANGE:	19940204

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ACORN FUND INC
		DATE OF NAME CHANGE:	19920703
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0000002110
<SERIES-ID>S000009187
<SERIES-NAME>Columbia Acorn Select
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024966
<CLASS-CONTRACT-NAME>Columbia Acorn Select Class A
<CLASS-CONTRACT-TICKER-SYMBOL>LTFAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024967
<CLASS-CONTRACT-NAME>Columbia Acorn Select Class B
<CLASS-CONTRACT-TICKER-SYMBOL>LTFBX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024968
<CLASS-CONTRACT-NAME>Columbia Acorn Select Class C
<CLASS-CONTRACT-TICKER-SYMBOL>LTFCX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024969
<CLASS-CONTRACT-NAME>Columbia Acorn Select Class Z
<CLASS-CONTRACT-TICKER-SYMBOL>ACTWX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000094635
<CLASS-CONTRACT-NAME>Columbia Acorn Select Class I
<CLASS-CONTRACT-TICKER-SYMBOL>CACIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122743
<CLASS-CONTRACT-NAME>Columbia Acorn Select Class R4
<CLASS-CONTRACT-TICKER-SYMBOL>CSSRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122744
<CLASS-CONTRACT-NAME>Columbia Acorn Select Class R5
<CLASS-CONTRACT-TICKER-SYMBOL>CSLRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122745
<CLASS-CONTRACT-NAME>Columbia Acorn Select Class Y
<CLASS-CONTRACT-TICKER-SYMBOL>CSLYX
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>497
<SEQUENCE>1
<FILENAME>d22943d497.htm
<DESCRIPTION>COLUMBIA ACORN TRUST
<TEXT>
Document 1 - file: d22943d497.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g22943covltr_pg01a.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g22943covltr_pg01a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g22943covltr_pg01b.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g22943covltr_pg01b.jpg

</DOCUMENT>
</SEC-DOCUMENT>