Francisco Santos "Frank" Mir, III (born May 24, 1979) is an American mixed martial artist, who competes for Bellator MMA in the Heavyweight division. He formerly competed in the Ultimate Fighting Championship (UFC) for sixteen years. A former UFC Heavyweight Champion, he currently holds the record for most fights, victories, and submissions in UFC Heavyweight history, and is tied for 4th most UFC victories overall. Mir possessed the longest uninterrupted tenure of any fighter in UFC history. He is the first man to knock out and submit Antônio Rodrigo Nogueira.
Born and raised in Las Vegas, Nevada, Mir began training and competing in American Kenpo at a school owned by his parents, earning his black belt as a teenager. Mir's father was a Cuban-born wrestler of Russian and Moroccan heritage, who played a major role in convincing him to begin wrestling on the basis that it could help him avoid submissions. Mir joined the wrestling team at Bonanza High School during his junior year and lost his first nine matches. During his senior year (1998) he went 44–1 and won the state championship. Mir played fullback and defensive end on the school's football team that reached the Southern Zone semifinals in 1997, and also competed in track and field. His discus throw of 177 feet, 10 inches is still a Sunset Regional record.