<SEC-DOCUMENT>0000100334-17-000178-index.html : 20170731
<SEC-HEADER>0000100334-17-000178.hdr.sgml : 20170731
<ACCEPTANCE-DATETIME>20170731102813
ACCESSION NUMBER:		0000100334-17-000178
CONFORMED SUBMISSION TYPE:	497
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20170731
DATE AS OF CHANGE:		20170731
EFFECTIVENESS DATE:		20170731

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AMERICAN CENTURY MUTUAL FUNDS, INC.
		CENTRAL INDEX KEY:			0000100334
		IRS NUMBER:				446006315
		STATE OF INCORPORATION:			MO
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		497
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	002-14213
		FILM NUMBER:		17991873

	BUSINESS ADDRESS:	
		STREET 1:		4500 MAIN STREET
		CITY:			KANSAS CITY
		STATE:			MO
		ZIP:			64111
		BUSINESS PHONE:		816-531-5575

	MAIL ADDRESS:	
		STREET 1:		4500 MAIN STREET
		CITY:			KANSAS CITY
		STATE:			MO
		ZIP:			64111

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AMERICAN CENTURY MUTUAL FUNDS INC
		DATE OF NAME CHANGE:	19970107

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	TWENTIETH CENTURY INVESTORS INC
		DATE OF NAME CHANGE:	19920703
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0000100334
<SERIES-ID>S000006194
<SERIES-NAME>SELECT FUND
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000017053
<CLASS-CONTRACT-NAME>INVESTOR CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>TWCIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000017054
<CLASS-CONTRACT-NAME>A CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>TWCAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000017055
<CLASS-CONTRACT-NAME>I CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>TWSIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000017058
<CLASS-CONTRACT-NAME>C CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>ACSLX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000017059
<CLASS-CONTRACT-NAME>R CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>ASERX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000131597
<CLASS-CONTRACT-NAME>R6 CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>ASDEX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000189737
<CLASS-CONTRACT-NAME>R5 CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>ASLGX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000189738
<CLASS-CONTRACT-NAME>Y CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>ASLWX
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>497
<SEQUENCE>1
<FILENAME>acmf8117select497e.htm
<DESCRIPTION>497 SELECT SUPPLEMENT
<TEXT>
Document 1 - file: acmf8117select497e.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>newaci_logoblk.jpg
<TEXT>
Document 2 - file: newaci_logoblk.jpg

</DOCUMENT>
</SEC-DOCUMENT>