EXHIBIT 21

3M COMPANY AND CONSOLIDATED SUBSIDIARIES (PARENT AND SUBSIDIARIES)

AS OF DECEMBER 31, 2017

Name of Company	Organized Under Law of
Registrant — 3M Company	Delaware
Consolidated subsidiaries of the Registrant:
3M Financial Management Company	Delaware
3M Innovative Properties Company	Delaware
3M Occupational Safety LLC	Delaware
3M Purification Inc.	Delaware
Aearo Holding LLC	Delaware
Aearo Intermediate LLC	Delaware
Aearo LLC	Delaware
Aearo Technologies LLC	Delaware
Capital Safety North America Holdings Inc.	Delaware
Capital Safety North America Intermediate Holdings LLC	Delaware
Ceradyne, Inc.	Delaware
Scott Technologies, Inc.	Delaware
3M Unitek Corporation	California
Meguiar's, Inc.	California
3M Health Information Systems, Inc.	Maryland
D B Industries, LLC	Minnesota
3M Australia Pty. Ltd.	Australia
3M Precision Grinding GmbH	Austria
3M Belgium bvba/sprl	Belgium
3M do Brasil Ltda.	Brazil
3M Manaus Industria de Produtos Quimicos Ltda.	Brazil
3M Canada Company - Compagnie 3M Canada	Canada
Capital Safety Group Canada ULC	Canada
3M China Limited	China
3M International Trading (Shanghai) Co., Ltd.	China
3M Investments (China) Co., Ltd.	China
3M Material Technology (Suzhou) Co., Ltd.	China
3M Specialty Materials (Shanghai) Co., Ltd.	China
3M Asia Pacific UK Holding Ltd	England
Capital Safety Global Holdings Limited	England
3M Products Limited	England
Capital Safety UK Holding Ltd	England
3M Purification	France
3M France S.A.S.	France
Capital Safety Group EMEA	France
Oldham S.A.S.	France
3M Deutschland GmbH	Germany
3M Real Estate GmbH & Co KG	Germany
Dyneon GmbH	Germany
3M Hong Kong Limited	Hong Kong
3M India Limited	India
3M ITALIA s.r.l.	Italy
3M Japan Limited	Japan
3M Japan Holdings G.K.	Japan

Name of Company	Organized Under Law of
3M Japan Products Limited		Japan
3M Korea Ltd		Korea
3M Asset Management S.a.r.l.		Luxembourg
3M Global Capital S.a.r.l.		Luxembourg
3M Mexico, Sociedad Anonima de Capital Variable		Mexico
3M Asia Holding B.V.		Netherlands
3M Global Acquisitions B.V.		Netherlands
3M Holding Company B.V.		Netherlands
3M Intermediate Acquisitions B.V.		Netherlands
3M International Group B.V.		Netherlands
3M International Holding B.V.		Netherlands
3M International Investments B.V.		Netherlands
3M West Europe B.V.		Netherlands
3M Panama Pacifico S. de R.L		Panama
3M Wroclaw spolka z ograniczona odpowiedzialnoscia		Poland
3M Innovation Singapore Pte. Ltd.		Singapore
3M Singapore Pte. Ltd.		Singapore
3M Espana, S.L.		Spain
3M Svenska Aktiebolag		Sweden
3M EMEA GmbH		Switzerland
3M Taiwan Limited		Taiwan
3M Taiwan Optronics Corporation		Taiwan
Alpha Beta Global Tapes and Adhesives Co., Ltd.		Taiwan
3M Thailand Limited		Thailand
3M UK Holdings Limited		United Kingdom
3M United Kingdom Public Limited Company		United Kingdom
Capital Safety Acquisitions Limited		United Kingdom
Scott Health & Safety Limited		United Kingdom

NOTE: Subsidiary companies excluded from the above listing, if considered in the aggregate, would not constitute a significant subsidiary.