Randy Duane Couture (IPA-enko??t??rpron; born June 22, 1963) is an American mixed martial artist, Greco-Roman wrestler (Greco-Roman wrestling), actor, a three-time former heavyweight champion and a two-time light-heavyweight champion of the Ultimate Fighting Championship. Couture is one of only two UFC fighters to have held a championship title in two different divisions (heavyweight and light heavyweight; B.J. Penn, with his titles at welterweight and lightweight, is the other) in the Ultimate Fighting Championship, as well as the only five-time champion in UFC history. Couture has competed in 15 title fights, a record. Couture is a member of the UFC Hall of Fame and many consider him to be the most popular fighter in MMA history.

Couture was an Olympic wrestling alternate, and has lived in Corvallis, Oregon throughout much of his career, where he served as an assistant wrestling coach and a strength and conditioning coach for Oregon State University. He established Team Quest with Matt Lindland and Dan Henderson, a training camp for fighters, based out of Gresham, Oregon, and headed by coach Robert Folis. In 2005 Couture moved to Las Vegas (Las Vegas metropolitan area), where he opened his own extensive chain of gyms under the name Xtreme Couture. He currently trains at his Las Vegas-based gym. Couture also partnered with Bas Rutten in the opening of Legends Gym in Hollywood, California.

Couture is generally recognized as a clinch (Mixed martial arts#Strategies#Clinch fighting) and ground-and-pound (Mixed martial arts#Strategies#Ground-and-pound) fighter who uses his wrestling ability to execute take downs (takedown (grappling)), establish top position (grappling position) and successively strike the opponent on the bottom. Couture has also displayed a variety of skills in boxing, Muay Thai and Brazilian Jiu-Jitsu; submitting (submission (combat sport term)) three opponents using different chokeholds. Couture is the only athlete in UFC history to win a championship after becoming a Hall of Fame member and is the oldest title holder ever (in the UFC and MMA). Along with Chuck Liddell, Couture is widely credited for bringing mixed martial arts into the mainstream of American pop culture and sports (Sports in the United States).