Daniel Jeffery Henderson is an American retired mixed martial artist and Olympic wrestler, who last competed as a middleweight in the Ultimate Fighting Championship. He was the last Strikeforce Light Heavyweight Champion and was the last Welterweight and Middleweight champion of Pride Fighting Championships. He was the only double champion in the history of Pride FC. Henderson was the Brazil Open '97 Tournament Champion, the UFC 17 Middleweight Tournament Champion, the Rings: King of Kings 1999 Tournament Champion and the Pride Welterweight Grand Prix Tournament Champion. Henderson also challenged for the UFC Middleweight Championship (2x), the UFC Light Heavyweight Championship and the Strikeforce Middleweight Championship. Henderson was the first mixed martial artist to hold two titles in two different weight classes concurrently in a major MMA promotion. At the time of his retirement after UFC 204, he was the oldest fighter on the UFC roster.

The Ultimate Fighting Championship (UFC) is an American mixed martial arts (MMA) promotion company based in Las Vegas, Nevada. It is owned and operated by TKO Group Holdings, a majority owned subsidiary of Endeavor Group Holdings. It is the largest MMA promotion in the world as of 2023. It produces events worldwide that showcase 11 weight divisions and abides by the Unified Rules of Mixed Martial Arts. As of 2022, it had held over 600 events. Dana White has been its president since 2001 and CEO since 2023. Under White's stewardship, it has grown into a global multi-billion-dollar enterprise.