Doping cases in mixed martial arts

Irish boxer and mixed martial arts fighter

Brock Edward Lesnar is an American-Canadian professional wrestler and former mixed martial artist, amateur wrestler and professional American football player. As a wrestler, he is best known for his time with WWE. Lesnar had three previous tenures with the company from 2000 to 2004, 2012 to 2020, and again from 2021 to 2026. Lesnar is the only person to have won the primary heavyweight championships of World Wrestling Entertainment (WWE), Ultimate Fighting Championship (UFC), New Japan Pro-Wrestling (NJPW), the Inoki Genome Federation (IGF), and the National Collegiate Athletic Association (NCAA).

Jonathan Dwight Jones is an American former professional mixed martial artist who competed from 2008 to 2025. During his career with the Ultimate Fighting Championship (UFC), he was the Light Heavyweight Champion from 2011 to 2015 and from 2018 to 2020, and the Heavyweight Champion from 2023 to 2025, as well as the interim Light Heavyweight Champion in 2016. He is regarded as one of the greatest mixed martial artists of all time.

Croatian mixed martial artist, kickboxer and law enforcement officer

Islam Ramazanovich Makhachev is a Russian professional mixed martial artist and former sambo competitor. He currently competes in the Welterweight division of the Ultimate Fighting Championship (UFC), where he is the current UFC Welterweight Champion and former UFC Lightweight Champion. A professional since 2010, along with becoming a combat sambo world champion in 2016 and two-time Russian national champion at 74 kg. As of 18 November 2025, he is #1 in the UFC men's pound-for-pound rankings.

Brazilian mixed martial artist

American mixed martial artist

Dutch mixed martial artist and kickboxer

Brazilian mixed martial artist

Cuban mixed martial artist and wrestler (born 1977)

American mixed martial artist, professional wrestler and actor

American mixed martial artist

American mixed martial artist (1974–2016)

Brazilian mixed martial artist

American mixed martial artist (1971–2016)

American mixed martial artist (born 1994)

American mixed martial artist

Vietnamese-American martial artist and actor

Brazilian mixed martial artist

American mixed martial artist

Brazilian mixed martial arts (MMA) fighter

Brazilian mixed martial arts (MMA) fighter

American mixed martial artist

Brazilian mixed martial arts (MMA) fighter

Polish judoka

American mixed martial artist

American mixed martial artist and professional wrestler

American mixed martial artist

German mixed martial artist

Brazilian mixed martial arts (MMA) fighter

American mixed martial artist and professional wrestler

American mixed martial artist

American mixed martial artist (born 1977)

Cuban judoka and mixed martial arts (MMA) fighter

American wrestler and mixed martial artist (born 1985)

American mixed martial artist (born 1979)

American mixed martial artist (1977–2022)

American mixed martial artist and professional wrestler

American mixed martial artist

Italian mixed martial artist

Brazilian mixed martial arts fighter

American mixed martial artist

Russian mixed martial arts fighter

American mixed martial artist

American mixed martial arts fighter

Brazilian kickboxer and mixed martial arts (MMA) fighter

Brazilian mixed martial arts (MMA) fighter

American mixed martial artist

American mixed martial arts fighter

American mixed martial artist

American mixed martial artist

mixed martial artist

Armenian martial artist

Polish martial artist

American martial artist

Brazilian mixed martial artist

American mixed martial artist

Brazilian martial artist

Brazilian martial artist

American martial artist