Stealth BioTherapeutics (MITO) F-3 Shelf registration (foreign)

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement onForm F-3 of our report dated April 1, 2020, relating to the consolidated financial statements of Stealth BioTherapeutics Corp appearing in the Annual Report on Form20-F for the year ended December 31, 2019. We also consent to the reference to us under the heading “Experts” in such Registration Statement.

/s/ Deloitte & Touche LLP

Boston, Massachusetts

April 1, 2020