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ACCESSION NUMBER:		0001193125-20-101713
CONFORMED SUBMISSION TYPE:	485BPOS
PUBLIC DOCUMENT COUNT:		13
FILED AS OF DATE:		20200409
DATE AS OF CHANGE:		20200408
EFFECTIVENESS DATE:		20200409

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:		485BPOS
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-236783
		FILM NUMBER:		20782991

	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
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<OWNER-CIK>0000002110
<SERIES-ID>S000009188
<SERIES-NAME>Columbia Acorn International Select
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024970
<CLASS-CONTRACT-NAME>Columbia Acorn International Select Class A
<CLASS-CONTRACT-TICKER-SYMBOL>LAFAX
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<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024972
<CLASS-CONTRACT-NAME>Columbia Acorn International Select Class C
<CLASS-CONTRACT-TICKER-SYMBOL>LFFCX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024973
<CLASS-CONTRACT-NAME>Columbia Acorn International Select Institutional Class
<CLASS-CONTRACT-TICKER-SYMBOL>ACFFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122746
<CLASS-CONTRACT-NAME>Columbia Acorn International Select Institutional 2 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CRIRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122747
<CLASS-CONTRACT-NAME>Columbia Acorn International Select Institutional 3 Class
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<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122748
<CLASS-CONTRACT-NAME>Columbia Acorn International Select Advisor Class
<CLASS-CONTRACT-TICKER-SYMBOL>CILRX
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<DOCUMENT>
<TYPE>485BPOS
<SEQUENCE>1
<FILENAME>d900979d485bpos.htm
<DESCRIPTION>COLUMBIA ACORN TRUST
<TEXT>
Document 1 - file: d900979d485bpos.htm

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<DOCUMENT>
<TYPE>EX-99.(14)
<SEQUENCE>2
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<DESCRIPTION>CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
<TEXT>
Document 2 - file: d900979dex9914.htm

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Document 4 - file: g900979g0405051301285.jpg

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Document 5 - file: g900979g0405051301612.jpg

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Document 6 - file: g900979g0405051301753.jpg

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Document 7 - file: g900979g0407092135472.jpg

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Document 8 - file: g900979g06k85.jpg

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Document 9 - file: g900979g28o28.jpg

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Document 10 - file: g900979g33d88.jpg

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Document 11 - file: g900979g49f48.jpg

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Document 12 - file: g900979g69g73.jpg

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Document 13 - file: g900979g71d23.jpg

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Document 14 - file: g900979g91d89.jpg

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