Vadim Nemkov [608x342]
Vadim Nemkov [608x342] (Credit: Lucas Noonan/Bellator MMA)

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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