Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Blue Bird Corporation

Macon, Georgia

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-261858, No. 333-261125, No. 333-236372, No. 333-206831 and No. 333-202801) and Form S-8 (No. 333-237102, No. 333-207420, and No. 333-204514) of Blue Bird Corporation of our reports dated December 11, 2023, relating to the consolidated financial statements and schedule, and the effectiveness of Blue Bird Corporation’s internal control over financial reporting, which appear in this Form 10-K.

/s/ BDO USA, P.C.

Atlanta, Georgia

December 11, 2023