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| | Name of Subsidiary | | Abbreviation | | Country |
| | NAFTA | | | | |
| | ArcelorMittal Dofasco G.P. | | ArcelorMittal Dofasco | | Canada |
| | ArcelorMittal México S.A. de C.V. | | ArcelorMittal Mexico | | Mexico |
| | ArcelorMittal Long Products Canada G.P. | | ArcelorMittal Long Products Canada | | Canada |
| ArcelorMittal Texas HBI LLC | | ArcelorMittal Texas HBI | | USA |
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| | Brazil and neighboring countries ("Brazil") | | |
| | ArcelorMittal Brasil S.A. | | ArcelorMittal Brasil | | Brazil |
| | Acindar Industria Argentina de Aceros S.A. | | Acindar | | Argentina |
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| | 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 |
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| | 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 |
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| | 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 |
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