Exhibit 15.5 [Bernardo Horta de Cerqueira Viana] CONSENT OF QUALIFIED PERSON Re: Annual Report on Form 20-F of ArcelorMittal I, Bernardo Horta de Cerqueira Viana, in connection with ArcelorMittal's Annual Report on Form 20-F for the year ended December 31, 2021 (the "2021 20-F"): a) certify that I have supervised and validated the preparation of the Mineral Resources of Andrade iron ore mine; b) consent to the use of and references to my name, including my status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the 2021 20-F and Mineral Resources of Andrade iron ore mine; and c) consent to the incorporation by reference of the 2021 20-F into the Registration Statements Nos. 333-147382, 333-153576, 333-162697 and 333-170117 on Form S-8 and Registration Statement No. 333-256031 on Form F-3 (and any amendments or supplements thereto). I am responsible for authoring, and this consent pertains to, Mineral Resources of Andrade iron ore mine. I certify that I have read the 2021 20-F and that it fairly and accurately represents the mineral resources for each property for which I am responsible. Dated: March 2, 2022 /s/ Bernardo Horta de Cerqueira Viana Bernardo Horta de Cerqueira Viana Bsc Geology Director GE21 FAIG3709

[Porfirio Cabaleiro Rodriguez] CONSENT OF QUALIFIED PERSON Re: Annual Report on Form 20-F of ArcelorMittal I, Porfirio Cabaleiro Rodriguez, in connection with ArcelorMittal's Annual Report on Form 20-F for the year ended December 31, 2021 (the "2021 20-F"): a) certify that I have supervised and validated the preparation of the Mineral Reserves of Andrade iron ore mine; b) consent to the use of and references to my name, including my status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the 2021 20-F and Mineral Reserves of Andrade iron ore mine; and c) consent to the incorporation by reference of the 2021 20-F into the Registration Statements Nos. 333-147382, 333-153576, 333-162697 and 333-170117 on Form S-8 and Registration Statement No. 333-256031 on Form F-3 (and any amendments or supplements thereto). I am responsible for authoring, and this consent pertains to, Mineral Reserves of Andrade iron ore mine. I certify that I have read the 2021 20-F and that it fairly and accurately represents the mineral reserves for each property for which I am responsible. Dated: March 2, 2022 /s/ Porfirio Cabaleiro Rodriguez Porfirio Cabaleiro Rodriguez Bsc Mining Engineer Director GE21 FAIG 3708

[Bernardo Horta de Cerqueira Viana] CONSENT OF QUALIFIED PERSON Re: Annual Report on Form 20-F of ArcelorMittal I, Bernardo Horta de Cerqueira Viana, in connection with ArcelorMittal's Annual Report on Form 20-F for the year ended December 31, 2021 (the "2021 20-F"): a) certify that I have supervised and validated the preparation of the Mineral Resources of Serra Azul iron ore mine; b) consent to the use of and references to my name, including my status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the 2021 20-F and Mineral Resources of Serra Azul iron ore mines; and c) consent to the incorporation by reference of the 2021 20-F into the Registration Statements Nos. 333-147382, 333-153576, 333-162697 and 333-170117 on Form S-8 and Registration Statement No. 333-256031 on Form F-3 (and any amendments or supplements thereto). I am responsible for authoring, and this consent pertains to, Mineral Resources of Serra Azul iron ore mine. I certify that I have read the 2021 20-F and that it fairly and accurately represents the mineral resources for each property for which I am responsible. Dated: March 2, 2022 /s/ Bernardo Horta de Cerqueira Viana Bernardo Horta de Cerqueira Viana Bsc Geology Director GE21 FAIG 3709

[Porfirio Cabaleiro Rodriguez] CONSENT OF QUALIFIED PERSON Re: Annual Report on Form 20-F of ArcelorMittal I, Porfirio Cabaleiro Rodriguez, in connection with ArcelorMittal's Annual Report on Form 20-F for the year ended December 31, 2021 (the "2021 20-F"): a) certify that I have supervised and validated the preparation of the Mineral Reserves of Serra Azul iron ore mine; b) consent to the use of and references to my name, including my status as an expert or "qualified person" (as defined in Subpart 1300 of Regulation S-K promulgated by the U.S. Securities and Exchange Commission), in connection with the 2021 20-F and Mineral Reserves of Serra Azul iron ore mines; and c) consent to the incorporation by reference of the 2021 20-F into the Registration Statements Nos. 333-147382, 333-153576, 333-162697 and 333-170117 on Form S-8 and Registration Statement No. 333-256031 on Form F-3 (and any amendments or supplements thereto). I am responsible for authoring, and this consent pertains to, Mineral Reserves of Serra Azul iron ore mine. I certify that I have read the 2021 20-F and that it fairly and accurately represents the mineral reserves for each property for which I am responsible. Dated: March 2, 2022 /s/ Porfirio Cabaleiro Rodriguez Porfirio Cabaleiro Rodriguez Bsc Mining Engineer Director GE21 FAIG 3708