Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the incorporation by reference in this Registration Statement on FormS-1 of our report dated February 14, 2020 relating to the financial statements of Avantor, Inc. and subsidiaries, appearing in the Annual Report on Form10-K of Avantor, Inc. 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
Philadelphia, Pennsylvania
May 18, 2020