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Exhibit 8.1

LIST OF SIGNIFICANT SUBSIDIARIES

The following is a list of ArcelorMittal’s significant operating subsidiaries as of December 31, 2020, each wholly- or majority-owned directly or indirectly through intermediate holding companies

Name of Subsidiary

Abbreviation

Country

NAFTA

ArcelorMittal Dofasco G.P.

ArcelorMittal Dofasco

Canada

ArcelorMittal México S.A. de C.V.

ArcelorMittal Mexico

Mexico

ArcelorMittal USA LLC1

ArcelorMittal USA

USA

ArcelorMittal Long Products Canada G.P.

ArcelorMittal Long Products Canada

Canada

Brazil and neighboring countries ("Brazil")

ArcelorMittal Brasil S.A.

ArcelorMittal Brasil

Brazil

Acindar Industria Argentina de Aceros S.A.

Acindar

Argentina

Europe

ArcelorMittal France S.A.S.

ArcelorMittal France

France

ArcelorMittal Belgium N.V.

ArcelorMittal Belgium

Belgium

ArcelorMittal España S.A.

ArcelorMittal España

Spain

ArcelorMittal Flat Carbon Europe S.A.

AMFCE

Luxembourg

ArcelorMittal Poland S.A.

ArcelorMittal Poland

Poland

ArcelorMittal Eisenhüttenstadt GmbH

ArcelorMittal Eisenhüttenstadt

Germany

ArcelorMittal Bremen GmbH

ArcelorMittal Bremen

Germany

ArcelorMittal Méditerranée S.A.S.

ArcelorMittal Méditerranée

France

ArcelorMittal Belval & Differdange S.A.

ArcelorMittal Belval & Differdange

Luxembourg

ArcelorMittal Hamburg GmbH

ArcelorMittal Hamburg

Germany

ArcelorMittal Duisburg GmbH

ArcelorMittal Duisburg

Germany

ArcelorMittal International Luxembourg S.A.

ArcelorMittal International Luxembourg

Luxembourg

ArcelorMittal Italia S.p.A.2

ArcelorMittal Italia

Italy

Africa and Commonwealth of Independent States ("ACIS")

ArcelorMittal South Africa Ltd.

ArcelorMittal South Africa

South Africa

JSC ArcelorMittal Temirtau

ArcelorMittal Temirtau

Kazakhstan

PJSC ArcelorMittal Kryvyi Rih

ArcelorMittal Kryvyi Rih

Ukraine

Mining

ArcelorMittal Mining Canada G.P. and ArcelorMittal Infrastructure Canada G.P.

ArcelorMittal Mines and Infrastructure Canada ("AMMC")

Canada

ArcelorMittal Liberia Ltd

ArcelorMittal Liberia

Liberia

JSC ArcelorMittal Temirtau

ArcelorMittal Temirtau

Kazakhstan

PJSC ArcelorMittal Kryvyi Rih

ArcelorMittal Kryvyi Rih

Ukraine

1. On December 9, 2020, the Company completed the sale of ArcelorMittal USA. See "—Key transactions and events in 2020" and note 2.3.1 to the consolidated financial statements.

2. On December 10, 2020, the Company signed a binding agreement with Invitalia, an Italian state-owned company, to form a public-private partnership between the parties. As a result, the carrying amount of the assets and liabilities of ArcelorMittal Italia was classified as held for sale at December 31, 2020 and will be accounted for under the equity method upon closing of the first investment (expected in the first quarter of 2021). See "Introduction—Key transactions and events in 2020" and note 2.3.2 for further information.