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
Bellator: Ryan Bader
PFL: Renan Ferreira
One: Anatoly Malykhin
LIGHT HEAVYWEIGHT (205)
UFC: Alex Pereira
Bellator: Vacant
PFL: Impa Kasanganay
One: Anatoly Malykhin (225 pounds)
Rizin: Vacant
MIDDLEWEIGHT (185)
UFC: Dricus Du Plessis
Bellator: Johnny Eblen
One: Anatoly Malykhin (205 pounds)
WELTERWEIGHT (170)
UFC: Leon Edwards
Bellator: Ramazan Kuramagomedov
PFL: Magomed Magomedkerimov
One: Christian Lee (185 pounds)
LIGHTWEIGHT (155)
UFC: Islam Makhachev
Bellator: Usman Nurmagomedov
PFL: Olivier Aubin-Mercier
One: Christian Lee (170 pounds)
Rizin: Roberto de Souza
MEN'S FEATHERWEIGHT (145)
UFC: Ilia Topuria
Bellator: Patricio Freire
PFL: Jesus Pinedo
One: Tang Kai (155 pounds)
Rizin: Chihiro Suzuki
MEN'S BANTAMWEIGHT (135)
UFC: Sean O'Malley
Bellator: Patchy Mix
One: Fabricio Andrade (145 pounds)
Rizin: Vacant
MEN'S FLYWEIGHT (125)
UFC: Alexandre Pantoja
One: Demetrious Johnson (135 pounds)
Rizin: Kyoji Horiguchi
MEN'S STRAWWEIGHT (115)
One: Joshua Pacio (125 pounds)
WOMEN'S FEATHERWEIGHT (145)
Bellator: Cris Cyborg
Invicta: Vacant
WOMEN'S BANTAMWEIGHT (135)
UFC: Raquel Pennington
Invicta: Talita Bernardo
WOMEN'S FLYWEIGHT (125)
UFC: Alexa Grasso
Bellator: Liz Carmouche
Invicta: Vacant
WOMEN'S STRAWWEIGHT (115)
UFC: Zhang Weili
One: Xiong Jing Nan (125 pounds)
Invicta: Danni McCormack
SUPER ATOMWEIGHT (108)
Rizin: Seika Izawa
ATOMWEIGHT (105)
One: Stamp Fairtex (115 pounds)
Invicta: Vacant