Fathom Digital Manufacturing Corporation - Ordinary Shares (FATH) S-1 IPO registration

Exhibit 23.3

CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS

We have issued our report dated July 28, 2021, with respect to the combined financial statements of Incodema, Inc. and NewChem, Inc. contained in the Registration Statement and Prospectus. We consent to the use of the aforementioned report in the Registration Statement and Prospectus, and to the use of our name as it appears under the caption “Experts.”

/s/ GRANT THORNTON LLP

Milwaukee, Wisconsin

January 14, 2022