Exhibit 23

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (No. 33-67190, 333-48498, 333-142247, 333-176371, 333-202855, 333-238305) on Form S-8 and the registration statement (No. 333-285210) on Form S-3ASR of our report dated March 3, 2026, with respect to the consolidated financial statements of Kadant Inc. and the effectiveness of internal control over financial reporting.

/s/ KPMG LLP

Boston, Massachusetts

March 3, 2026