Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement in Form S-3 of 4Front Ventures Corp. of our report dated April 15, 2024, relating to the consolidated financial statements, appearing in the Annual Report of Form 10-K of 4Front Ventures Corp. for the year ended December 31, 2023.

We also consent to the reference to us under the caption “Experts” in this Registration Statement.

/s/ DAVIDSON & COMPANY LLP

Chartered Professional Accountants

Vancouver, Canada

May 8, 2024

1200 – 609 Granville Street, P.O. Box 10372, Pacific Centre, Vancouver, B.C., Canada V7Y 1G6

Telephone (604) 687-0947 Davidson-co.com