The Ultimate Fighter: Undefeated is an installment of the Ultimate Fighting Championship (UFC)-produced reality television series The Ultimate Fighter. Tryouts were announced on November 16, scheduled for 26 days later. This season will feature undefeated featherweights and lightweights. The coaches for this season were announced on January 26, pitting current UFC Heavyweight Champion Stipe Miocic against current UFC Light Heavyweight Champion Daniel Cormier. The cast was officially announced on the same day.

Daniel Ryan Cormier is an American former professional mixed martial artist, amateur wrestler, and current commentator for the UFC. As a former Ultimate Fighting Championship (UFC) Light Heavyweight and Heavyweight Champion, Cormier is the second fighter in UFC history to hold titles in two weight classes simultaneously and is the first fighter to have title defenses in two divisions. As an international wrestler, Cormier was a six-time US World or Olympic Team Member, a World bronze medalist, a World Cup runner-up, a 2003 Pan American Games gold medalist, and a two-time Pan American champion. In folkstyle wrestling, Cormier was an NCAA Division I national finalist and two-time Big 12 Conference runner-up for the Oklahoma State Cowboys. He was also a two-time NJCAA champion.