<SEC-DOCUMENT>0000062709-21-000028-index.html : 20210625
<SEC-HEADER>0000062709-21-000028.hdr.sgml : 20210625
<ACCEPTANCE-DATETIME>20210625134711
ACCESSION NUMBER:		0000062709-21-000028
CONFORMED SUBMISSION TYPE:	11-K
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20201231
FILED AS OF DATE:		20210625
DATE AS OF CHANGE:		20210625

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MARSH & MCLENNAN COMPANIES, INC.
		CENTRAL INDEX KEY:			0000062709
		STANDARD INDUSTRIAL CLASSIFICATION:	INSURANCE AGENTS BROKERS & SERVICES [6411]
		IRS NUMBER:				362668272
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		11-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-05998
		FILM NUMBER:		211046622

	BUSINESS ADDRESS:	
		STREET 1:		1166 AVENUE OF THE AMERICAS
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036
		BUSINESS PHONE:		2123455000

	MAIL ADDRESS:	
		STREET 1:		1166 AVENUE OF THE AMERICAS
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MARSH & MCLENNAN COMPANIES INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MARLENNAN CORP
		DATE OF NAME CHANGE:	19760505
</SEC-HEADER>
<DOCUMENT>
<TYPE>11-K
<SEQUENCE>1
<FILENAME>mmcsip11k123120.htm
<DESCRIPTION>MMC SIP 11-K 12.31.2020
<TEXT>
Document 1 - file: mmcsip11k123120.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23
<SEQUENCE>2
<FILENAME>mmc11k12312020exhibit23.htm
<DESCRIPTION>MMC 11K 12.31.2020 EXHIBIT 23
<TEXT>
Document 2 - file: mmc11k12312020exhibit23.htm

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

</DOCUMENT>
</SEC-DOCUMENT>