Mixed martial arts champions come in all sizes -- from heavyweights up to 265 pound, to atomweights at 105 pounds. They come from all around the world -- from Australia to Brazil to Cleveland to Dagestan. They fight for organizations ranging from the UFC, the biggest fight promotion in the world, to Bellator and the PFL, as well as Asian powerhouse One Championship and Japan's Rizin, and the all-women fight organization Invicta FC.
Here are the champions from all of those promotions.
Click here for a look at the current and all-time UFC champions.
To keep up with current fights, go to the MMA schedule page.
HEAVYWEIGHT (265 pounds and under)
UFC: Jon Jones
PFL Super Fights: Francis Ngannou
One: Oumar Kane
LIGHT HEAVYWEIGHT (205)
UFC: Magomed Ankalaev
One: Anatoly Malykhin (225 pounds)
Rizin: Vacant
MIDDLEWEIGHT (185)
UFC: Dricus Du Plessis
One: Anatoly Malykhin (205 pounds)
WELTERWEIGHT (170)
UFC: Belal Muhammad
One: Christian Lee (185 pounds)
LIGHTWEIGHT (155)
UFC: Islam Makhachev
One: Christian Lee (170 pounds)
Rizin: Roberto de Souza
MEN'S FEATHERWEIGHT (145)
UFC: Alexander Volkanovski
One: Tang Kai (155 pounds)
Rizin: Kleber Koike Erbst
MEN'S BANTAMWEIGHT (135)
UFC: Merab Dvalishvili
One: Fabricio Andrade (145 pounds)
Rizin: Naoki Inoue
MEN'S FLYWEIGHT (125)
UFC: Alexandre Pantoja
One: Yuya Wakamatsu (135 pounds)
Rizin: Vacant
MEN'S STRAWWEIGHT (115)
One: Joshua Pacio (125 pounds)
WOMEN'S FEATHERWEIGHT (145)
PFL Super Fights: Cris Cyborg
Invicta: Vacant
WOMEN'S BANTAMWEIGHT (135)
UFC: Julianna Peña
Invicta: Jennifer Maia
WOMEN'S FLYWEIGHT (125)
UFC: Valentina Shevchenko
Invicta: Vacant
WOMEN'S STRAWWEIGHT (115)
UFC: Zhang Weili
One: Xiong Jing Nan (125 pounds)
Invicta: Vacant
SUPER ATOMWEIGHT (108)
Rizin: Seika Izawa
ATOMWEIGHT (105)
One: Stamp Fairtex (115 pounds)
Invicta: Elisandra Ferreira