Exhibit 23.1 

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statements Nos. 333-258637, 333-258636, 333-221176, 333-201636, 333-192019, 333-165261, 333-155304, 333-138716, 333-130270, 333-120395, 333-118322, 333-95901, 333-89008, and 333-43787 on Form S-8 of our reports dated February 24, 2022, relating to the consolidated financial statements and financial statement schedule of Iron Mountain Incorporated, and the effectiveness of Iron Mountain Incorporated’s internal control over financial reporting, appearing in this Annual Report on Form 10-K of Iron Mountain Incorporated for the year ended December 31, 2021.

/s/ DELOITTE & TOUCHE LLP

Boston, Massachusetts

February 24, 2022