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 Clevelend 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: Francis Ngannou
Bellator: Ryan Bader
One: Brandon Vera
PFL: Ali Isaev
LIGHT HEAVYWEIGHT (205)
UFC: Jan Blachowicz
Bellator: Vadim Nemkov
One: Aung La Nsang
PFL: Emiliano Sordi
Rizin: Vacant
MIDDLEWEIGHT (185)
UFC: Israel Adesanya
Bellator: Gegard Mousasi
One: Reinier de Ridder
WELTERWEIGHT (170)
UFC: Kamaru Usman
Bellator: Douglas Lima
One: Kiamrian Abbasov
PFL: Ray Cooper III
MEN'S LIGHTWEIGHT (155)
UFC: Vacant
Bellator: Patricio Freire
One: Christian Lee
PFL: Natan Schulte
MEN'S FEATHERWEIGHT (145)
UFC: Alexander Volkanovski
Bellator: Patricio Freire
One: Thanh Le
PFL: Lance Palmer
MEN'S BANTAMWEIGHT (135)
UFC: Aljamain Sterling
Bellator: Juan Archuleta
One: Bibiano Fernandes
Rizin: Vacant
MEN'S FLYWEIGHT (125)
UFC: Deiveson Figueiredo
One: Adriano Moraes
MEN'S STRAWWEIGHT (115)
One: Joshua Pacio
WOMEN'S LIGHTWEIGHT (155)
PFL: Kayla Harrison
WOMEN'S FEATHERWEIGHT (145)
UFC: Amanda Nunes
Bellator: Cris Cyborg
Invicta: Pam Sorenson
WOMEN'S BANTAMWEIGHT (135)
UFC: Amanda Nunes
Invicta: Julija Stoliarenko
WOMEN'S FLYWEIGHT (125)
UFC: Valentina Shevchenko
Bellator: Juliana Velasquez
Invicta: Vanessa Porto
WOMEN'S STRAWWEIGHT (115)
UFC: Zhang Weili
One: Xiong Jing Nan
Invicta: Kanako Murata
SUPER ATOMWEIGHT (108)
Rizin: Seo Hee Ham
ATOMWEIGHT (105)
One: Angela Lee
Rizin: Seo Hee Ham
Invicta: Alesha Zappitella