The Ultimate Fighter 33 (also known as TUF 33) is a 2025 installment of the Ultimate Fighting Championship (UFC)-produced reality television series The Ultimate Fighter on ESPN+ and UFC Fight Pass. This season will mark the 20th anniversary of Ultimate Fighter. This season will feature male flyweights and welterweights. The casting call for the season started from November 4, 2024, to December 13, 2024, and the show will air every Tuesday from May 27, 2025.

Former UFC Heavyweight and UFC Light Heavyweight Champion Daniel Cormier and former UFC Light Heavyweight and UFC Middleweight title challenger Chael Sonnen are expected to serve as coaches for the season