The Ultimate Fighter 26 (also known as The Ultimate Fighter: A New World Champion) is an installment of the Ultimate Fighting Championship (UFC)-produced reality television series The Ultimate Fighter.

Tryouts were announced on May 3, scheduled for 20 days later. This season will exclusively feature the women's flyweight division, with the goal of crowning the UFC's inaugural 125-pound champion in the season's finale. All women who were currently on the UFC roster were allowed to submit their names for the tournament, as were females unsigned by the UFC.

The news came just months after UFC president Dana White told reporters in Las Vegas that the UFC had no plans to institute any further women's divisions in 2017 other than women's featherweight. It also canceled plans the UFC previously had to hold a TUF 26 casting call for women's strawweight, women's bantamweight, and men's middleweight.

The coaches for this season were announced on July 13, pitting former two-time Bellator Lightweight Champion and former UFC Lightweight Champion Eddie Alvarez against former WSOF Lightweight Champion Justin Gaethje. The cast was officially announced on August 5, including inaugural Invicta FC Flyweight Champion Barb Honchak, The Ultimate Fighter: Team Rousey vs. Team Tate contestant Roxanne Modafferi and former Invicta FC Bantamweight Champion and current UFC fighter Lauren Murphy.

Episode 1: A New World Champion (August 30, 2017)

Episode 2: Fight! (September 6, 2017)

Episode 3: Time to Shine (September 13, 2017)

Episode 4: The Truth in Me (September 20, 2017)