Fighters
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Women's Bantamweight
| Name | Nickname | Division | Record | Status |
|---|---|---|---|---|
| AJ Cunningham | “The Savage” | Bantamweight | 11-5-0 (W-L-D) | Inactive |
| AJ Dobson | Middleweight | 7-3-0 (W-L-D) | Active | |
| AJ Fletcher | “The Ghost” | Welterweight | 10-3-0 (W-L-D) | Active |
| Aalon Cruz | Lightweight | 8-4-0 (W-L-D) | Inactive | |
| Aaron Brink | Heavyweight | 26-26-0 (W-L-D) | Inactive | |
| Aaron Jeffery | Middleweight | 10-3-0 (W-L-D) | Inactive | |
| Aaron Phillips | “The Dragon” | Bantamweight | 12-5-0 (W-L-D) | Inactive |
| Aaron Pico | Featherweight | 14-5-0 (W-L-D) | Active | |
| Aaron Riley | Lightweight | 30-14-1 (W-L-D) | Inactive | |
| Aaron Rosa | Light Heavyweight | 18-6-0 (W-L-D) | Inactive | |
| Aaron Simpson | “A-Train” | Welterweight | 12-5-0 (W-L-D) | Inactive |
| Aaron Wilkinson | “The Daywalker” | Lightweight | 11-7-0 (W-L-D) | Inactive |
| Abdul Azeem Badakhshi | Featherweight | 13-3-0 (W-L-D) | Active | |
| Abdul Hussein | “King” | Bantamweight | 15-2-0 (W-L-D) | Active |
| Abdul Rakhman Yakhyaev | “The Hunter” | Light Heavyweight | 10-0-0 (W-L-D) | Active |
| Abdul Rakhman Yakhyaev | Inactive | |||
| Abdul Razak Alhassan | Middleweight | 12-7-0 (1 NC) | Inactive | |
| Abdul-Kareem Al-Selwady | “Pride of Palestine” | Lightweight | 16-4-0 (W-L-D) | Active |
| Abdul-Kerim Edilov | Light Heavyweight | 17-4-0 (W-L-D) | Inactive | |
| Abel Trujillo | “Killa” | Lightweight | 15-8-0 (1 NC) | Inactive |
| Abner Lloveras | “Skullman” | Lightweight | 20-9-1 (W-L-D) | Inactive |
| Abu Azaitar | “Captain Morocco” | Middleweight | 14-4-1 (W-L-D) | Inactive |
| Abubakar Nurmagomedov | Welterweight | 17-4-1 (W-L-D) | Active | |
| Abubakar Vagaev | Welterweight | 24-4-0 (W-L-D) | Active | |
| Abus Magomedov | Middleweight | 29-7-1 (W-L-D) | Active | |
| Acacio dos Santos | Light Heavyweight | 14-5-0 (W-L-D) | Inactive | |
| Achilles Estremadura | Lightweight | 7-1-0 (W-L-D) | Inactive | |
| Adam Antolin | “Captain Chaos” | Flyweight | 12-3-0 (W-L-D) | Inactive |
| Adam Cella | Middleweight | 6-8-0 (W-L-D) | Inactive | |
| Adam Fugitt | Welterweight | 10-6-0 (W-L-D) | Inactive | |
| Adam Hunter | “Warhammer” | Middleweight | 7-1-0 (W-L-D) | Inactive |
| Adam Khaliev | Welterweight | 6-0-0 (W-L-D) | Inactive | |
| Adam Milstead | “The Prototype” | Light Heavyweight | 8-4-0 (W-L-D) | Inactive |
| Adam Wieczorek | “Siwy” | Heavyweight | 10-2-0 (W-L-D) | Inactive |
| Adam Yandiev | Middleweight | 9-1-0 (W-L-D) | Inactive | |
| Adlan Amagov | “Borz” | Welterweight | 14-2-1 (W-L-D) | Inactive |
| Adli Edwards | Featherweight | 4-1-0 (W-L-D) | Inactive | |
| Adrian Diaz | Featherweight | 11-4-1 (W-L-D) | Inactive | |
| Adrian Luna Martinetti | 17-2-0 (W-L-D) | Inactive | ||
| Adrian Serrano | Welterweight | 56-29-4 (W-L-D) | Inactive | |
| Adrian Yanez | Bantamweight | 18-6-1 (W-L-D) | Active | |
| Adriano Martins | Lightweight | 28-9-0 (W-L-D) | Inactive | |
| Adriano Santos | Middleweight | 0-1-0 (W-L-D) | Inactive | |
| Adrián Luna Martinetti | Bantamweight | 17-2-0 (W-L-D) | Active | |
| Ahmad Hassanzada | Lightweight | 11-3-0 (W-L-D) | Inactive | |
| Aiemann Zahabi | “Icemann” | Bantamweight | 14-3-0 (W-L-D) | Active |
| Aili Muratbek | Lightweight | 0-0-0 (W-L-D) | Inactive | |
| Ailin Perez | “Fiona” | Women's Bantamweight | 13-2-0 (W-L-D) | Active |
| Aisling Daly | “Ais the Bash” | Women's Strawweight | 16-6-0 (W-L-D) | Inactive |
| Akbarh Arreola | “El Caballero” | Lightweight | 23-11-1 (W-L-D) | Inactive |
| Akihiro Gono | “The Japanese Sensation” | Welterweight | 35-21-8 (W-L-D) | Inactive |
| Akira Corassani | Featherweight | 12-6-0 (W-L-D) | Inactive | |
| Akitoshi Tamura | “The Ironman” | Lightweight | 21-18-2 (W-L-D) | Inactive |
| Al Iaquinta | “Raging” | Lightweight | 14-7-1 (W-L-D) | Active |
| Al Matavao | Light Heavyweight | 8-3-0 (W-L-D) | Inactive | |
| Alan Baudot | “The Black Samourai” | Heavyweight | 8-3-0 (W-L-D) | Inactive |
| Alan Belcher | “The Talent” | Middleweight | 18-8-0 (W-L-D) | Inactive |
| Alan Jouban | “Brahma” | Welterweight | 17-7-0 (W-L-D) | Inactive |
| Alan Omer | Featherweight | 20-5-0 (W-L-D) | Inactive | |
| Alan Patrick | “Nuguette” | Lightweight | 15-4-0 (1 NC) | Inactive |
| Alatengheili | “The Mongolian Knight” | Bantamweight | 17-10-2 (W-L-D) | Active |
| Albert Cheng | Welterweight | 7-4-0 (W-L-D) | Inactive | |
| Albert Duraev | Middleweight | 16-5-0 (W-L-D) | Active | |
| Albert Morales | “The Warrior” | Bantamweight | 7-4-1 (W-L-D) | Inactive |
| Albert Tumenov | “Einstein” | Welterweight | 18-4-0 (W-L-D) | Inactive |
| Alberta Cerra | Heavyweight | 0-0-0 (W-L-D) | Inactive | |
| Alberta Cerra Leon | 0-1-0 (W-L-D) | Inactive | ||
| Alberto Cerro Leon | 0-0-0 (W-L-D) | Inactive | ||
| Alberto Crane | Lightweight | 15-5-0 (W-L-D) | Inactive | |
| Alberto Mina | “Soldier of God” | Welterweight | 13-1-0 (W-L-D) | Inactive |
| Alberto Montes | “The Promise” | Featherweight | 12-1-0 (W-L-D) | Active |
| Alberto Pereira | “Uda” | Middleweight | 9-2-0 (W-L-D) | Inactive |
| Alden Coria | “Cobra” | Flyweight | 13-3-0 (W-L-D) | Active |
| Alejandro Flores | Featherweight | 17-3-0 (W-L-D) | Inactive | |
| Alejandro Pérez | “Turbo” | Featherweight | 23-9-1 (W-L-D) | Inactive |
| Aleksa Camur | Light Heavyweight | 6-3-0 (W-L-D) | Active | |
| Aleksandar Rakić | “Rocket” | Light Heavyweight | 14-6-0 (W-L-D) | Active |
| Aleksandra Albu | 3-2-0 (W-L-D) | Inactive | ||
| Aleksandre Topuria | “El Conquistador” | Bantamweight | 7-1-0 (W-L-D) | Active |
| Aleksei Kunchenko | Welterweight | 20-2-0 (W-L-D) | Inactive | |
| Aleksei Oleinik | “The Boa Constrictor” | Heavyweight | 60-17-1 (W-L-D) | Inactive |
| Alen Amedovski | Middleweight | 8-4-0 (W-L-D) | Inactive | |
| Alessandro Costa | “Nono” | Flyweight | 17-5-0 (W-L-D) | Active |
| Alessandro Ricci | Lightweight | 10-5-0 (W-L-D) | Inactive | |
| Alessio Di Chirico | “Manzo” | Middleweight | 13-7-0 (W-L-D) | Inactive |
| Alessio Sakara | “Legionarius” | Middleweight | 19-11-0 (1 NC) | Inactive |
| Alex Andrade | Middleweight | 10-5-0 (W-L-D) | Inactive | |
| Alex Caceres | “Bruce Leeroy” | Featherweight | 21-15-0 (W-L-D) | Inactive |
| Alex Chambers | “Astro Girl” | Women's Strawweight | 5-5-0 (W-L-D) | Inactive |
| Alex Enlund | Featherweight | 14-2-0 (W-L-D) | Inactive | |
| Alex Garcia | “The Dominican Nightmare” | Welterweight | 15-6-0 (W-L-D) | Inactive |
| Alex Gilpin | Featherweight | 11-1-0 (W-L-D) | Active | |
| Alex Gorgees | “Hitman” | Lightweight | 6-1-0 (W-L-D) | Inactive |
| Alex Hunter | Heavyweight | 2-0-0 (W-L-D) | Inactive | |
| Alex Karalexis | “T-Rex” | Welterweight | 10-6-0 (W-L-D) | Inactive |
| Alex Morono | “The Great White” | Welterweight | 24-13-0 (W-L-D) | Inactive |
| Alex Nicholson | “The Spartan” | Middleweight | 7-4-0 (W-L-D) | Inactive |
| Alex Oliveira | “Cowboy” | Welterweight | 22-12-1 (1 NC) | Inactive |
| Alex Pereira | “Poatan” | Heavyweight | 13-4-0 (W-L-D) | Active |
| Alex Perez | Flyweight | 26-10-0 (W-L-D) | Active | |
| Alex Reyes | “The Executioner” | Lightweight | 13-5-0 (W-L-D) | Active |
| Alex Ricci | 10-5-0 (W-L-D) | Inactive | ||
| Alex Schoenauer | Middleweight | 15-10-0 (W-L-D) | Inactive | |
| Alex Serdyukov | “The Russian Crusher” | Welterweight | 8-5-0 (W-L-D) | Inactive |
| Alex Soto | “Extremo” | Bantamweight | 8-3-1 (W-L-D) | Inactive |
| Alex Steibling | Middleweight | 0-0-0 (W-L-D) | Inactive | |
| Alex Stiebling | 19-11-1 (W-L-D) | Inactive | ||
| Alex Torres | “Rolo” | Featherweight | 5-4-0 (W-L-D) | Inactive |
| Alex White | “The Spartan” | Lightweight | 13-6-0 (W-L-D) | Inactive |
| Alex da Silva | “Leko” | Lightweight | 21-4-0 (W-L-D) | Inactive |
| Alexa Grasso | Women's Flyweight | 17-5-1 (W-L-D) | Active | |
| Alexander Gustafsson | “The Mauler” | Light Heavyweight | 18-8-0 (W-L-D) | Inactive |
| Alexander Hernandez | “El Gran Chango” | Lightweight | 18-9-0 (W-L-D) | Active |
| Alexander Morgan | Featherweight | 11-5-0 (W-L-D) | Inactive | |
| Alexander Munoz | Lightweight | 7-2-0 (W-L-D) | Inactive | |
| Alexander Poppeck | Light Heavyweight | 9-3-0 (W-L-D) | Inactive | |
| Alexander Soldatkin | Heavyweight | 14-4-0 (W-L-D) | Active | |
| C Alexander Volkanovski | “The Great” | Featherweight | 28-4-0 (W-L-D) | Active |
| Alexander Volkov | “Drago” | Heavyweight | 40-11-0 (W-L-D) | Active |
| Alexander Yakovlev | “Russian Thunder” | Lightweight | 24-10-1 (W-L-D) | Inactive |
| Alexandr Romanov | “King Kong” | Heavyweight | 18-3-0 (W-L-D) | Inactive |
| Alexandra Albu | “Stitch” | Women's Strawweight | 7-2-0 (W-L-D) | Inactive |
| Alexandre Barros | “Baixinho” | Welterweight | 22-11-0 (W-L-D) | Inactive |
| Alexandre Dantas | “Cafe” | Heavyweight | 0-3-0 (W-L-D) | Inactive |
| Alexandre Ferreira | “Cacareco” | Light Heavyweight | 18-6-0 (W-L-D) | Inactive |
| Alexandre Nogueira | “Pequeno” | Bantamweight | 13-4-2 (W-L-D) | Inactive |
| Alexandre Pantoja | “The Cannibal” | Flyweight | 30-6-0 (W-L-D) | Active |
| Alexia Thainara | “Burguesinha” | Women's Strawweight | 14-1-0 (W-L-D) | Active |
| Alexis Davis | Women's Bantamweight | 21-11-0 (W-L-D) | Inactive | |
| Alexis Dufresne | “Sneaky Zebra” | Women's Bantamweight | 6-3-0 (W-L-D) | Inactive |
| Alfonso Alcarez | Lightweight | 1-3-1 (W-L-D) | Inactive | |
| Alfred Khashakyan | Bantamweight | 8-3-0 (W-L-D) | Inactive | |
| Ali Al-Qaisi | “The Royal Fighter” | Bantamweight | 8-5-0 (W-L-D) | Inactive |
| Ali Bagautinov | “Puncher” | Flyweight | 15-6-0 (W-L-D) | Inactive |
| Aliaskhab Khizriev | “Black Wolf” | Middleweight | 14-0-0 (1 NC) | Active |
| Alibi Idiris | Flyweight | 11-1-0 (W-L-D) | Active | |
| Alice Ardelean | Women's Strawweight | 12-7-0 (W-L-D) | Active | |
| Alice Pereira | “Golden Girl” | Women's Bantamweight | 7-1-0 (W-L-D) | Active |
| Alistair Overeem | “The Demolition Man” | Heavyweight | 47-19-0 (W-L-D) | Inactive |
| Aljamain Sterling | “Funk Master” | Featherweight | 26-5-0 (W-L-D) | Active |
| Allan Begosso | “Mini” | Bantamweight | 7-2-1 (W-L-D) | Active |
| Allan Goes | Middleweight | 10-5-2 (W-L-D) | Inactive | |
| Allan Nascimento | “Puro Osso” | Flyweight | 22-7-0 (W-L-D) | Active |
| Allan Zuniga | “Tigre” | Lightweight | 13-1-0 (W-L-D) | Inactive |
| Allen Berube | “Monstah” | Lightweight | 4-3-0 (W-L-D) | Inactive |
| Allen Crowder | “Pretty Boy” | Heavyweight | 10-4-0 (W-L-D) | Inactive |
| Allen Frye Jr. | “AJ” | Heavyweight | 6-1-0 (W-L-D) | Active |
| Alonzo Menifield | “Atomic” | Light Heavyweight | 18-6-1 (W-L-D) | Active |
| Alptekin Ozkilic | “The Turkish Delight” | Flyweight | 9-5-0 (W-L-D) | Inactive |
| Alton Cunningham | “The Bo-Man” | Light Heavyweight | 4-2-0 (W-L-D) | Inactive |
| Alton Meeks | “Murda” | Heavyweight | 3-0-0 (W-L-D) | Inactive |
| Alvaro Herrera | “Chango” | Welterweight | 9-6-0 (W-L-D) | Inactive |
| Alvaro Herrera Mendoza | 9-6-0 (W-L-D) | Inactive | ||
| Alvaro Ivan Lopez Rodrigues | Flyweight | 0-0-0 (W-L-D) | Inactive | |
| Alvin Hines | “Goozie” | Heavyweight | 7-2-0 (W-L-D) | Active |
| Alvin Robinson | “Kid” | Lightweight | 15-9-0 (W-L-D) | Inactive |
| Amanda Cooper | “ABC” | Women's Strawweight | 3-5-0 (W-L-D) | Inactive |
| Amanda Lemos | Women's Strawweight | 15-6-1 (W-L-D) | Active | |
| Amanda Nunes | “The Lioness” | Women's Bantamweight | 23-5-0 (W-L-D) | Active |
| Amanda Ribas | Women's Strawweight | 13-7-0 (W-L-D) | Active | |
| Amar Suloev | Middleweight | 24-7-0 (W-L-D) | Inactive | |
| Amaury Bitetti | Middleweight | 5-2-0 (W-L-D) | Inactive | |
| Amilcar Alves | “The Terminator” | Welterweight | 15-12-0 (W-L-D) | Inactive |
| Amir Albazi | “The Prince” | Flyweight | 17-3-0 (W-L-D) | Active |
| Amir Aliakbari | Heavyweight | 10-1-0 (W-L-D) | Inactive | |
| Amir Sadollah | Welterweight | 6-5-0 (W-L-D) | Inactive | |
| Amiran Gogoladze | Welterweight | 14-3-0 (W-L-D) | Active | |
| Anderson Berinja | Bantamweight | 0-0-0 (W-L-D) | Active | |
| Anderson Silva | “The Spider” | Middleweight | 34-11-0 (W-L-D) | Inactive |
| Anderson dos Santos | “Berinja” | Bantamweight | 21-9-0 (W-L-D) | Inactive |
| Andre Ewell | “Mr. Highlight” | Featherweight | 17-9-0 (W-L-D) | Inactive |
| Andre Fialho | Welterweight | 16-8-0 (W-L-D) | Active | |
| Andre Fili | “Touchy” | Featherweight | 25-14-0 (W-L-D) | Active |
| Andre Gusmao | Light Heavyweight | 6-3-0 (W-L-D) | Inactive | |
| Andre Lima | “Mascote” | Flyweight | 11-1-0 (W-L-D) | Active |
| Andre Muniz | “Sergipano” | Middleweight | 24-8-0 (W-L-D) | Inactive |
| Andre Pederneiras | Lightweight | 1-1-2 (W-L-D) | Inactive | |
| Andre Petroski | Middleweight | 13-7-0 (W-L-D) | Active | |
| Andre Roberts | Heavyweight | 14-2-1 (W-L-D) | Inactive | |
| Andre Soukhamthath | “The Asian Sensation” | Bantamweight | 13-8-0 (W-L-D) | Inactive |
| Andre Winner | Lightweight | 21-11-2 (W-L-D) | Inactive | |
| Andrea Lee | “KGB” | Women's Flyweight | 13-11-0 (W-L-D) | Inactive |
| Andreas Gustafsson | “Bane” | Welterweight | 12-3-0 (W-L-D) | Inactive |
| Andreas Michailidis | “The Spartan” | Welterweight | 13-6-0 (W-L-D) | Inactive |
| Andreas Spang | Heavyweight | 9-3-0 (W-L-D) | Inactive | |
| Andreas Stahl | “Real Steel” | Welterweight | 10-4-0 (W-L-D) | Inactive |
| Andrei Arlovski | “The Pit Bull” | Heavyweight | 34-24-0 (W-L-D) | Inactive |
| Andrei Semenov | Middleweight | 34-9-2 (W-L-D) | Inactive | |
| Andrew Craig | “Highlight” | Middleweight | 9-4-0 (W-L-D) | Inactive |
| Andrew Holbrook | Lightweight | 12-3-0 (W-L-D) | Inactive | |
| Andrew Sanchez | “El Dirte” | Middleweight | 13-7-0 (W-L-D) | Inactive |
| Andrew Todhunter | “The Sniper” | Welterweight | 8-0-0 (W-L-D) | Inactive |
| Andrey Pulyaev | Middleweight | 10-3-0 (W-L-D) | Active | |
| Andy Anderson | 0-1-0 (W-L-D) | Inactive | ||
| Andy Enz | “Lionheart” | Middleweight | 10-4-0 (W-L-D) | Inactive |
| Andy Ogle | “The Little Axe” | Featherweight | 9-6-0 (W-L-D) | Inactive |
| Andy Wang | “The Yellow Peril” | Lightweight | 7-8-1 (W-L-D) | Inactive |
| Ange Loosa | “The Last Ninja” | Welterweight | 10-5-0 (1 NC) | Inactive |
| Angel De Anda | “The Dream” | Light Heavyweight | 18-6-0 (W-L-D) | Inactive |
| Angel Pacheco | Bantamweight | 7-4-0 (W-L-D) | Active | |
| Angela Hill | “Overkill” | Women's Strawweight | 19-16-0 (W-L-D) | Active |
| Angela Magana | “Your Majesty” | Women's Strawweight | 11-9-0 (W-L-D) | Inactive |
| Angelo Trevino | Welterweight | 7-3-0 (W-L-D) | Inactive | |
| Anistavio Medeiros | “Gasparzinho” | Featherweight | 19-10-0 (W-L-D) | Inactive |
| Anna Elmose | “Panda” | Women's Strawweight | 3-2-0 (W-L-D) | Inactive |
| Anna Melisano | “Bandana” | Women's Flyweight | 6-2-0 (W-L-D) | Active |
| Ansar Chalangov | Welterweight | 14-5-0 (W-L-D) | Inactive | |
| Anshul Jubli | “King of Lions” | Lightweight | 7-2-0 (W-L-D) | Active |
| Ante Delija | “Walking Trouble” | Heavyweight | 26-8-0 (W-L-D) | Active |
| Anthony Adams | Middleweight | 8-2-0 (W-L-D) | Inactive | |
| Anthony Birchak | “El Toro” | Bantamweight | 16-8-0 (W-L-D) | Inactive |
| Anthony Christodoulou | Lightweight | 12-7-0 (W-L-D) | Inactive | |
| Anthony Fryklund | “The Freak” | Middleweight | 11-4-0 (W-L-D) | Inactive |
| Anthony Hamilton | “Freight Train” | Heavyweight | 15-9-0 (W-L-D) | Inactive |
| Anthony Hernandez | “Fluffy” | Middleweight | 15-3-0 (W-L-D) | Active |
| Anthony Ivy | “Aquaman” | Welterweight | 8-4-0 (W-L-D) | Inactive |
| Anthony Johnson | “Rumble” | Light Heavyweight | 22-6-0 (W-L-D) | Inactive |
| Anthony Lapsley | “The Recipe” | Welterweight | 23-7-0 (W-L-D) | Inactive |
| Anthony Leone | Bantamweight | 15-8-0 (W-L-D) | Inactive | |
| Anthony Macias | 26-18-0 (W-L-D) | Inactive | ||
| Anthony Morrison | “Cheesesteak” | Lightweight | 20-12-0 (W-L-D) | Inactive |
| Anthony Njokuani | “The Assassin” | Lightweight | 16-12-0 (W-L-D) | Inactive |
| Anthony Perosh | “The Hippo” | Light Heavyweight | 15-10-0 (W-L-D) | Inactive |
| Anthony Pettis | “Showtime” | Welterweight | 24-10-0 (W-L-D) | Inactive |
| Anthony Rocco Martin | Welterweight | 17-6-0 (W-L-D) | Inactive | |
| Anthony Romero | Lightweight | 8-0-0 (W-L-D) | Active | |
| Anthony Smith | “Lionheart” | Light Heavyweight | 38-22-0 (W-L-D) | Inactive |
| Anthony Torres | “The Crush” | Welterweight | 5-3-0 (W-L-D) | Inactive |
| Anton Berzin | “The Body Snatcher” | Light Heavyweight | 5-1-0 (W-L-D) | Inactive |
| Anton Kuivanen | Lightweight | 24-10-0 (W-L-D) | Inactive | |
| Anton Turkalj | “The Pleasure Man” | Light Heavyweight | 8-4-0 (W-L-D) | Active |
| Anton Zafir | Welterweight | 7-3-0 (W-L-D) | Inactive | |
| Antoni Hardonk | “Mr. Wonderful” | Heavyweight | 8-6-0 (W-L-D) | Inactive |
| Antonina Shevchenko | “La Pantera” | Women's Flyweight | 10-4-0 (W-L-D) | Inactive |
| Antonio Arroyo | Middleweight | 9-5-0 (W-L-D) | Inactive | |
| Antonio Banuelos | Bantamweight | 20-11-1 (W-L-D) | Inactive | |
| Antonio Braga Neto | Middleweight | 9-3-0 (W-L-D) | Inactive | |
| Antonio Carlos Junior | “Cara de Sapato” | Middleweight | 11-5-0 (1 NC) | Inactive |
| Antonio Carvalho | “Pato” | Featherweight | 15-6-0 (W-L-D) | Inactive |
| Antonio Jones | Middleweight | 6-1-0 (W-L-D) | Inactive | |
| Antonio McKee | Lightweight | 29-6-2 (W-L-D) | Inactive | |
| Antonio Mendes | “Samuray” | Light Heavyweight | 18-13-0 (W-L-D) | Inactive |
| Antonio Rodrigo Nogueira | 34-10-1 (W-L-D) | Inactive | ||
| Antonio Rogerio Nogueira | “Minotouro” | Light Heavyweight | 23-10-0 (W-L-D) | Inactive |
| Antonio Silva | “Bigfoot” | Heavyweight | 19-12-1 (W-L-D) | Inactive |
| Antonio Trocoli | “Malvado” | Middleweight | 12-7-0 (W-L-D) | Inactive |
| Antonio dos Santos | “Junior Alpha” | Middleweight | 6-4-0 (W-L-D) | Inactive |
| Antwain Britt | “The Juggernaut” | Middleweight | 11-6-0 (W-L-D) | Inactive |
| Anvar Boynazarov | Featherweight | 3-1-0 (W-L-D) | Active | |
| Anying Wang | 2-1-0 (W-L-D) | Inactive | ||
| Aoriqileng | “The Mongolian Murderer” | Bantamweight | 26-12-0 (W-L-D) | Active |
| Ariane Carnelossi | “Sorriso” | Women's Strawweight | 15-5-0 (W-L-D) | Inactive |
| Ariane da Silva | “The Queen” | Women's Flyweight | 17-11-0 (W-L-D) | Inactive |
| Ariel Beck | Women's Flyweight | 4-5-0 (W-L-D) | Inactive | |
| Ariel Gandulla | Middleweight | 7-9-0 (W-L-D) | Inactive | |
| Arjan Bhullar | 9-1-0 (W-L-D) | Inactive | ||
| Arjan Singh Bhullar | Heavyweight | 9-1-0 (W-L-D) | Inactive | |
| Arman Ashimov | Flyweight | 11-3-1 (W-L-D) | Inactive | |
| Arman Tsarukyan | “Ahalkalakets” | Lightweight | 23-3-0 (W-L-D) | Active |
| Armando Villarreal | “La Lumbre” | Bantamweight | 5-2-0 (W-L-D) | Inactive |
| Armen Petrosyan | “Superman” | Middleweight | 9-5-0 (W-L-D) | Inactive |
| Arnold Allen | “Almighty” | Featherweight | 21-4-0 (W-L-D) | Active |
| Art Jimmerson | Light Heavyweight | 0-1-0 (W-L-D) | Inactive | |
| Art Santore | Middleweight | 18-8-0 (W-L-D) | Inactive | |
| Artem Frolov | Middleweight | 11-0-0 (W-L-D) | Inactive | |
| Artem Lobov | “The Russian Hammer” | Featherweight | 13-15-1 (W-L-D) | Inactive |
| Artem Vakhitov | Light Heavyweight | 3-1-0 (W-L-D) | Active | |
| Artur Minev | “Headhunter” | Lightweight | 7-1-0 (W-L-D) | Active |
| Asbel Cancio | 0-1-0 (W-L-D) | Inactive | ||
| Ashiek Ajim | Bantamweight | 6-2-0 (W-L-D) | Inactive | |
| Ashkan Mokhtarian | “The Assassin” | Flyweight | 13-3-0 (W-L-D) | Inactive |
| Ashlee Evans-Smith | “Rebel Girl” | Women's Bantamweight | 6-6-0 (W-L-D) | Inactive |
| Ashley Yoder | “Spider Monkey” | Women's Strawweight | 8-9-0 (W-L-D) | Active |
| Asikeerbai Jinensibieke | Lightweight | 0-0-0 (W-L-D) | Active | |
| Asikerbai Jinensibieke | Lightweight | 0-0-0 (W-L-D) | Inactive | |
| Askar Askar | “AK-47” | Featherweight | 11-1-0 (W-L-D) | Inactive |
| Askar Askarov | “Bullet” | Flyweight | 14-1-1 (W-L-D) | Inactive |
| Askar Mozharov | Light Heavyweight | 19-13-0 (W-L-D) | Inactive | |
| Aspen Ladd | Women's Bantamweight | 9-3-0 (W-L-D) | Inactive | |
| Assuerio Silva | Heavyweight | 16-8-0 (W-L-D) | Inactive | |
| Asu Almabayev | “Zulfikar” | Flyweight | 24-3-0 (W-L-D) | Active |
| Ateba Gautier | “The Storm” | Middleweight | 11-1-0 (W-L-D) | Active |
| Augusto Mendes | “Tanquinho” | Bantamweight | 6-2-0 (W-L-D) | Inactive |
| Augusto Montano | “Dodger” | Welterweight | 15-3-0 (W-L-D) | Inactive |
| Augusto Sakai | Heavyweight | 16-5-1 (W-L-D) | Inactive | |
| Austen Lane | Light Heavyweight | 13-8-0 (1 NC) | Inactive | |
| Austin Arnett | “Golden Boy” | Featherweight | 16-6-0 (W-L-D) | Inactive |
| Austin Bashi | Featherweight | 14-2-0 (W-L-D) | Active | |
| Austin Hubbard | “Thud” | Lightweight | 17-10-0 (W-L-D) | Inactive |
| Austin Lingo | “Lights Out” | Featherweight | 9-3-0 (W-L-D) | Active |
| Austin Springer | Featherweight | 12-4-0 (W-L-D) | Inactive | |
| Austin Tweedy | “The Flash” | Lightweight | 8-2-0 (W-L-D) | Active |
| Austin Vanderford | Welterweight | 13-3-0 (W-L-D) | Active | |
| Axel Sola | Lightweight | 11-1-1 (W-L-D) | Active | |
| Azamat Bekoev | “Iron” | Middleweight | 20-5-0 (W-L-D) | Active |
| Azamat Gashimov | Flyweight | 8-3-0 (W-L-D) | Inactive | |
| Azamat Murzakanov | “Professional” | Light Heavyweight | 16-1-0 (W-L-D) | Active |
| Azat Maksum | “Qazaq” | Flyweight | 15-3-0 (W-L-D) | Inactive |
| Azunna Anyanwu | 14-5-0 (W-L-D) | Inactive | ||
| BJ Penn | “The Prodigy” | Lightweight | 16-14-2 (W-L-D) | Inactive |
| Baergeng Jieleyisi | 18-7-0 (W-L-D) | Inactive | ||
| Bahatebole Batebolati | Lightweight | 10-1-1 (W-L-D) | Inactive | |
| Baisangur Susurkaev | “The Real Hunter” | Middleweight | 12-0-0 (W-L-D) | Active |
| Barb Honchak | “The Little Warrior” | Women's Flyweight | 10-4-0 (W-L-D) | Inactive |
| Bart Palaszewski | “Bartimus” | Featherweight | 36-17-0 (W-L-D) | Inactive |
| Bartosz Fabinski | “The Butcher” | Middleweight | 15-5-0 (W-L-D) | Inactive |
| Bas Rutten | Heavyweight | 28-4-1 (W-L-D) | Inactive | |
| Bassil Hafez | “The Habibi” | Welterweight | 9-4-1 (W-L-D) | Active |
| Batgerel Danaa | “Storm” | Bantamweight | 12-5-0 (W-L-D) | Inactive |
| Bea Malecki | Women's Bantamweight | 4-1-0 (W-L-D) | Inactive | |
| Bec Rawlings | “Rowdy” | Women's Flyweight | 7-8-0 (W-L-D) | Inactive |
| Bekzat Almakhan | “The Turan Warrior” | Bantamweight | 12-4-0 (W-L-D) | Active |
| Belal Muhammad | “Remember The Name” | Welterweight | 24-6-0 (W-L-D) | Active |
| Ben Alloway | 18-8-0 (W-L-D) | Inactive | ||
| Ben Askren | “Funky” | Welterweight | 19-2-0 (W-L-D) | Inactive |
| Ben Earwood | Welterweight | 12-3-0 (W-L-D) | Inactive | |
| Ben Johnston | 5-2-0 (W-L-D) | Inactive | ||
| Ben Nguyen | “10” | Flyweight | 16-8-0 (W-L-D) | Inactive |
| Ben Rothwell | Heavyweight | 39-14-0 (W-L-D) | Inactive | |
| Ben Saunders | “Killa B” | Welterweight | 22-13-2 (W-L-D) | Inactive |
| Ben Sosoli | “Combat Wombat” | Heavyweight | 7-3-0 (W-L-D) | Inactive |
| Ben Wall | “Manimal” | Lightweight | 8-7-1 (W-L-D) | Inactive |
| Benardo Sopaj | “Lion King” | Bantamweight | 13-3-0 (W-L-D) | Active |
| Beneil Dariush | Lightweight | 23-8-1 (W-L-D) | Active | |
| Benito Lopez | “Golden Boy” | Bantamweight | 10-2-0 (W-L-D) | Inactive |
| Benji Radach | “Razor” | Middleweight | 21-7-0 (W-L-D) | Inactive |
| Benny Alloway | “Blanco” | Welterweight | 13-6-0 (W-L-D) | Inactive |
| Benoît Saint Denis | “God of War” | Lightweight | 17-4-0 (W-L-D) | Active |
| Benson Henderson | “Smooth” | Welterweight | 24-7-0 (W-L-D) | Inactive |
| Bentley Syler | “Dr. Bolivia” | Flyweight | 5-1-0 (W-L-D) | Inactive |
| Bernardo Magalhaes | “Trekko” | Lightweight | 13-4-0 (W-L-D) | Inactive |
| Besam Yousef | Welterweight | 7-4-0 (W-L-D) | Inactive | |
| Bethe Correia | “Pitbull” | Women's Bantamweight | 11-6-1 (W-L-D) | Inactive |
| Bevon Lewis | Middleweight | 7-3-0 (W-L-D) | Inactive | |
| Bharat Kandare | “Daring” | Bantamweight | 5-3-0 (W-L-D) | Inactive |
| Bia Mesquita | “The Lady GOAT” | Women's Bantamweight | 8-0-0 (W-L-D) | Active |
| Bill Algeo | “Senor Perfecto” | Featherweight | 18-9-0 (W-L-D) | Inactive |
| Bill Mahood | “The Butcher” | Light Heavyweight | 20-7-1 (W-L-D) | Inactive |
| Billy Elekana | “Son of Susie” | Light Heavyweight | 10-2-0 (W-L-D) | Active |
| Billy Miles | 2-2-0 (W-L-D) | Inactive | ||
| Billy Pasulatan | Flyweight | 10-3-0 (W-L-D) | Active | |
| Billy Quarantillo | Lightweight | 18-7-0 (W-L-D) | Active | |
| Billy Ray Goff | Welterweight | 9-4-0 (W-L-D) | Active | |
| Billy Ray Goff | 9-4-0 (W-L-D) | Inactive | ||
| Bilyal Makhov | Heavyweight | 0-0-0 (W-L-D) | Inactive | |
| Blagoy Ivanov | “Baga” | Heavyweight | 19-6-0 (W-L-D) | Inactive |
| Blake Bilder | “El Animal” | Featherweight | 8-2-1 (W-L-D) | Inactive |
| Blood Diamond | Welterweight | 3-3-0 (W-L-D) | Active | |
| Bo Nickal | Middleweight | 9-1-0 (W-L-D) | Active | |
| Bob Cook | Lightweight | 5-0-0 (W-L-D) | Inactive | |
| Bob Gilstrap | Middleweight | 5-7-0 (W-L-D) | Inactive | |
| Bobby Hoffman | “The Bad Seed” | Heavyweight | 36-10-1 (W-L-D) | Inactive |
| Bobby Moffett | “The Wolfman” | Featherweight | 13-5-0 (W-L-D) | Inactive |
| Bobby Nash | “Nashty” | Welterweight | 8-4-0 (W-L-D) | Inactive |
| Bobby Southworth | Light Heavyweight | 10-6-0 (W-L-D) | Inactive | |
| Bobby Voelker | “Vicious” | Welterweight | 19-13-0 (W-L-D) | Inactive |
| Bogdan Grad | “The Unleashed” | Featherweight | 15-4-0 (W-L-D) | Active |
| Bogdan Guskov | “Hitman” | Light Heavyweight | 18-3-1 (W-L-D) | Active |
| Bojan Mihajlovic | Heavyweight | 10-6-0 (W-L-D) | Inactive | |
| Bojan Velickovic | “Serbian Steel” | Welterweight | 15-6-1 (W-L-D) | Inactive |
| Bolaji Oki | “Zulu Warrior” | Lightweight | 10-4-0 (W-L-D) | Active |
| Boston Salmon | “Boom Boom” | Bantamweight | 6-3-0 (W-L-D) | Inactive |
| Brad Blackburn | “Bad” | Welterweight | 18-13-1 (W-L-D) | Inactive |
| Brad Gumm | Welterweight | 10-6-1 (W-L-D) | Inactive | |
| Brad Imes | Heavyweight | 13-7-0 (W-L-D) | Inactive | |
| Brad Katona | “Superman” | Bantamweight | 16-5-0 (W-L-D) | Inactive |
| Brad Kohler | Heavyweight | 12-15-0 (W-L-D) | Inactive | |
| Brad Morris | Light Heavyweight | 10-6-0 (W-L-D) | Inactive | |
| Brad Pickett | “One Punch” | Bantamweight | 25-14-0 (W-L-D) | Inactive |
| Brad Riddell | “Quake” | Lightweight | 10-4-0 (W-L-D) | Inactive |
| Brad Scott | 11-6-0 (W-L-D) | Inactive | ||
| Brad Tavares | Middleweight | 21-13-0 (W-L-D) | Active | |
| Bradley Scott | “Bear” | Welterweight | 12-6-0 (W-L-D) | Inactive |
| Brady Hiestand | “Bam Bam” | Bantamweight | 9-2-0 (W-L-D) | Inactive |
| Brady Huang | Bantamweight | 11-2-0 (W-L-D) | Inactive | |
| Branden Lee Hinkle | “The Iron Lion” | Light Heavyweight | 17-11-0 (W-L-D) | Inactive |
| Brando Pericic | “The Balkan Bear” | Heavyweight | 7-1-0 (W-L-D) | Active |
| Brandon Davis | “Killer B” | Bantamweight | 14-10-0 (W-L-D) | Inactive |
| Brandon Jenkins | “The Human Highlight Reel” | Lightweight | 15-9-0 (W-L-D) | Inactive |
| Brandon Lewis | Bantamweight | 6-2-0 (W-L-D) | Inactive | |
| Brandon Melendez | 25-25-0 (W-L-D) | Inactive | ||
| Brandon Moreno | “The Assassin Baby” | Flyweight | 23-10-2 (W-L-D) | Active |
| Brandon Royval | “Raw Dawg” | Flyweight | 18-9-0 (W-L-D) | Active |
| Brandon Sayles | Heavyweight | 5-1-0 (W-L-D) | Active | |
| Brandon Thatch | “Rukus” | Welterweight | 11-5-0 (W-L-D) | Inactive |
| Brandon Vera | “The Truth” | Heavyweight | 15-7-0 (W-L-D) | Inactive |
| Brandon Wolff | Welterweight | 7-5-0 (W-L-D) | Inactive | |
| Braxton Smith | “The Beautiful Monster” | Heavyweight | 5-2-0 (W-L-D) | Inactive |
| Brendan Allen | “All In” | Middleweight | 27-7-0 (W-L-D) | Active |
| Brendan Loughnane | Lightweight | 17-3-0 (W-L-D) | Inactive | |
| Brendan O'Reilly | “The Badger” | Welterweight | 6-3-0 (W-L-D) | Inactive |
| Brendan Schaub | “Big Brown” | Heavyweight | 10-5-0 (W-L-D) | Inactive |
| Brendon Marotte | “The Kid” | Featherweight | 8-3-0 (W-L-D) | Inactive |
| Brendson Ribeiro | “The Gorilla” | Light Heavyweight | 17-10-0 (W-L-D) | Active |
| Brett Johns | “The Pikey” | Bantamweight | 17-2-0 (W-L-D) | Inactive |
| Brian Bowles | Bantamweight | 10-3-0 (W-L-D) | Inactive | |
| Brian Camozzi | “Mantis” | Welterweight | 7-5-0 (W-L-D) | Inactive |
| Brian Cobb | “The Bandit” | Lightweight | 20-9-0 (W-L-D) | Inactive |
| Brian Ebersole | “Bad Boy” | Welterweight | 51-18-1 (W-L-D) | Inactive |
| Brian Foster | Welterweight | 27-10-0 (W-L-D) | Inactive | |
| Brian Gassaway | “Mandingo” | Welterweight | 29-20-2 (W-L-D) | Inactive |
| Brian Geraghty | “Duke” | Lightweight | 26-18-1 (W-L-D) | Inactive |
| Brian Houston | “BHue” | Middleweight | 4-6-0 (W-L-D) | Inactive |
| Brian Johnston | Heavyweight | 5-5-0 (W-L-D) | Inactive | |
| Brian Kelleher | “Boom” | Bantamweight | 24-16-0 (W-L-D) | Inactive |
| Brian Melancon | Welterweight | 7-3-0 (W-L-D) | Inactive | |
| Brian Ortega | “T-City” | Featherweight | 16-5-0 (W-L-D) | Active |
| Brian Stann | “All American” | Middleweight | 12-6-0 (W-L-D) | Inactive |
| Brianna Fortino | 9-3-0 (W-L-D) | Inactive | ||
| Brianna Fortino | “The Bull” | Women's Strawweight | 9-3-0 (W-L-D) | Inactive |
| Bristol Marunde | Welterweight | 16-10-0 (W-L-D) | Inactive | |
| Brock Jardine | “The Machine” | Welterweight | 12-6-0 (W-L-D) | Inactive |
| Brock Larson | Welterweight | 42-10-0 (W-L-D) | Inactive | |
| Brock Lesnar | Heavyweight | 5-3-0 (W-L-D) | Inactive | |
| Brodie Farber | Welterweight | 16-7-0 (W-L-D) | Inactive | |
| Brogan Walker | “Brogie The Bear” | Women's Flyweight | 8-5-0 (W-L-D) | Inactive |
| Brok Weaver | “Chata TUska” | Lightweight | 15-6-0 (W-L-D) | Inactive |
| Bruna Brasil | Women's Strawweight | 11-7-1 (W-L-D) | Inactive | |
| Brunno Ferreira | “The Hulk” | Middleweight | 15-4-0 (W-L-D) | Active |
| Bruno Assis | Middleweight | 8-4-0 (W-L-D) | Inactive | |
| Bruno Korea | Flyweight | 7-3-0 (W-L-D) | Inactive | |
| Bruno Lopes | “The Brazilian Cowboy” | Light Heavyweight | 14-3-0 (W-L-D) | Active |
| Bruno Oliveira | Light Heavyweight | 8-2-0 (W-L-D) | Active | |
| Bruno Santos | “Carioca” | Middleweight | 15-2-0 (W-L-D) | Inactive |
| Bruno Silva | “Blindado” | Middleweight | 23-13-0 (W-L-D) | Inactive |
| Bruno Silva | “Bulldog” | Flyweight | 15-9-2 (W-L-D) | Active |
| Bruno Souza | “The Tiger” | Featherweight | 10-3-0 (W-L-D) | Inactive |
| Bryan Barberena | “Bam Bam” | Middleweight | 18-12-0 (W-L-D) | Active |
| Bryan Battle | “The Butcher” | Welterweight | 13-2-0 (1 NC) | Inactive |
| Bryan Caraway | “Kid Lightning” | Bantamweight | 21-9-0 (W-L-D) | Inactive |
| Bryce Mitchell | “Thug Nasty” | Bantamweight | 19-4-0 (W-L-D) | Active |
| Bubba Bush | “The Fighting Texas Aggie” | Middleweight | 8-3-0 (W-L-D) | Inactive |
| Bubba McDaniel | “The Menace” | Middleweight | 21-8-0 (W-L-D) | Inactive |
| Buddy Roberts | Middleweight | 12-3-0 (W-L-D) | Inactive | |
| Byron Bloodworth | Bantamweight | 6-3-0 (W-L-D) | Inactive | |
| C.J. Keith | Lightweight | 8-4-0 (W-L-D) | Inactive | |
| CB Dollaway | “The Doberman” | Middleweight | 17-9-0 (W-L-D) | Inactive |
| CJ Fernandes | Welterweight | 14-8-3 (W-L-D) | Inactive | |
| CJ Hamilton | Flyweight | 11-4-0 (W-L-D) | Inactive | |
| CJ Vergara | Flyweight | 12-7-1 (W-L-D) | Inactive | |
| CM Punk | Welterweight | 0-1-0 (W-L-D) | Inactive | |
| Cain Carrizosa | “The Insane” | Lightweight | 10-3-0 (W-L-D) | Inactive |
| Cain Velasquez | Heavyweight | 14-3-0 (W-L-D) | Inactive | |
| Caio Bittencourt | Middleweight | 14-7-0 (W-L-D) | Inactive | |
| Caio Borralho | “The Natural” | Middleweight | 18-2-0 (W-L-D) | Active |
| Caio Machado | “Bigfoot” | Light Heavyweight | 8-4-1 (W-L-D) | Inactive |
| Caio Magalhaes | “Hellboy” | Middleweight | 10-3-0 (W-L-D) | Inactive |
| Cal Worsham | 13-10-0 (W-L-D) | Inactive | ||
| Cale Yarbrough | Middleweight | 8-3-0 (W-L-D) | Inactive | |
| Calen Born | Welterweight | 7-1-0 (W-L-D) | Inactive | |
| Callan Potter | “The Rockstar” | Welterweight | 18-9-0 (W-L-D) | Inactive |
| Calvin Kattar | Featherweight | 23-10-0 (W-L-D) | Active | |
| Cam Rowston | Middleweight | 15-3-0 (W-L-D) | Active | |
| Cam Rowston | 15-3-0 (W-L-D) | Inactive | ||
| Cameron Church | Lightweight | 4-1-0 (W-L-D) | Inactive | |
| Cameron Dollar | “Money Man” | Lightweight | 11-5-0 (W-L-D) | Inactive |
| Cameron Else | “Camchida” | Bantamweight | 10-6-0 (W-L-D) | Inactive |
| Cameron Olson | “Cap'n Crunch” | Light Heavyweight | 7-3-0 (W-L-D) | Inactive |
| Cameron Saaiman | “MSP” | Bantamweight | 9-3-0 (W-L-D) | Active |
| Cameron Smotherman | “The Baby-Faced Killa” | Bantamweight | 12-7-0 (W-L-D) | Inactive |
| Cameron VanCamp | “Jumpman” | Lightweight | 15-7-1 (W-L-D) | Inactive |
| Canaan Kawaihae | Featherweight | 6-2-0 (W-L-D) | Inactive | |
| Caol Uno | Lightweight | 33-19-5 (W-L-D) | Inactive | |
| Caolán Loughran | “The Don” | Bantamweight | 10-2-0 (W-L-D) | Inactive |
| Carl Deaton | “The Anishinaabe Kid” | Lightweight | 17-7-0 (W-L-D) | Active |
| Carla Esparza | “Cookie Monster” | Women's Strawweight | 20-8-0 (W-L-D) | Inactive |
| Carli Judice | “Crispy” | Women's Strawweight | 6-2-0 (W-L-D) | Active |
| Carlo Pedersoli | “Semento” | Welterweight | 11-3-0 (W-L-D) | Inactive |
| Carlo Pedersoli Jr | 11-3-0 (W-L-D) | Inactive | ||
| Carlo Prater | “Neo” | Lightweight | 31-18-1 (W-L-D) | Inactive |
| Carlos Baretto | Heavyweight | 0-0-0 (W-L-D) | Inactive | |
| Carlos Barreto | 14-9-0 (W-L-D) | Inactive | ||
| Carlos Candelario | “The Cannon” | Flyweight | 8-3-0 (W-L-D) | Active |
| Carlos Condit | “The Natural Born Killer” | Welterweight | 32-14-0 (W-L-D) | Inactive |
| Carlos Eduardo Rocha | “Ta Danado” | Welterweight | 9-4-0 (W-L-D) | Inactive |
| Carlos Felipe | “Boi” | Heavyweight | 11-2-0 (W-L-D) | Inactive |
| Carlos Hernandez | Flyweight | 10-5-0 (W-L-D) | Inactive | |
| Carlos Huachin | “Perro Malo” | Bantamweight | 10-5-1 (W-L-D) | Inactive |
| Carlos Leal | “The Lion” | Welterweight | 23-7-0 (W-L-D) | Active |
| Carlos Mota | “Tizil” | Flyweight | 8-2-0 (W-L-D) | Inactive |
| Carlos Newton | “The Ronin” | Welterweight | 16-14-0 (W-L-D) | Inactive |
| Carlos Prates | “The Nightmare” | Welterweight | 24-7-0 (W-L-D) | Active |
| C Carlos Ulberg | “Black Jag” | Light Heavyweight | 15-1-0 (W-L-D) | Active |
| Carlos Vera | “Pequeno” | Bantamweight | 12-4-0 (W-L-D) | Active |
| Carls John De Tomas | “CJ” | Flyweight | 6-2-0 (W-L-D) | Inactive |
| Carlston Harris | “Mocambique” | Welterweight | 19-8-0 (W-L-D) | Inactive |
| Carlton Minus | “Clutch” | Welterweight | 10-3-0 (W-L-D) | Inactive |
| Carmelo Marrero | “The Fury” | Light Heavyweight | 16-6-0 (W-L-D) | Inactive |
| Carol Foro | Women's Strawweight | 9-1-0 (W-L-D) | Active | |
| Caros Fodor | “The Future” | Lightweight | 11-6-0 (W-L-D) | Inactive |
| Carrese Archer | “One Punch” | Middleweight | 0-0-0 (W-L-D) | Inactive |
| Casey Kenney | Bantamweight | 16-4-1 (W-L-D) | Active | |
| Casey O'Neill | “King” | Women's Flyweight | 11-2-0 (W-L-D) | Active |
| Cat Zingano | “Alpha” | Featherweight | 10-4-0 (W-L-D) | Inactive |
| Cathal Pendred | Welterweight | 17-4-1 (W-L-D) | Inactive | |
| Ce Liu | Light Heavyweight | 0-0-0 (W-L-D) | Active | |
| Cedric Doumbe | Welterweight | 2-0-0 (W-L-D) | Inactive | |
| Cesar Almeida | “Cesinha” | Middleweight | 7-3-0 (W-L-D) | Active |
| Cesar Arzamendia | “Goku” | Lightweight | 8-3-0 (W-L-D) | Inactive |
| Cesar Marscucci | Lightweight | 3-2-0 (W-L-D) | Inactive | |
| Cezar Ferreira | “Mutante” | Middleweight | 13-8-0 (W-L-D) | Inactive |
| Cezary Oleksiejczuk | Middleweight | 17-3-0 (W-L-D) | Active | |
| Chad Anheliger | “The Monster” | Bantamweight | 13-8-0 (W-L-D) | Active |
| Chad Griggs | “The Grave Digger” | Light Heavyweight | 11-3-0 (W-L-D) | Inactive |
| Chad Hanekom | Middleweight | 9-3-0 (W-L-D) | Active | |
| Chad Johnson | Heavyweight | 6-2-0 (W-L-D) | Inactive | |
| Chad Laprise | “The Disciple” | Welterweight | 13-4-0 (W-L-D) | Inactive |
| Chad Mendes | “Money” | Featherweight | 18-5-0 (W-L-D) | Inactive |
| Chad Reiner | “The Grinder” | Welterweight | 33-18-0 (W-L-D) | Inactive |
| Chael Sonnen | 29-15-1 (W-L-D) | Inactive | ||
| Chan Mi Jeon | 5-2-0 (W-L-D) | Inactive | ||
| Chan Sung Jung | “The Korean Zombie” | Featherweight | 17-8-0 (W-L-D) | Active |
| Chance Rencountre | “Black Eagle” | Welterweight | 14-4-0 (W-L-D) | Inactive |
| Chandler Cole | Heavyweight | 10-4-0 (W-L-D) | Active | |
| ChangHo Lee | Bantamweight | 11-2-0 (W-L-D) | Active | |
| Changho Lee | 11-2-0 (W-L-D) | Inactive | ||
| Chanmi Jeon | “Ottogi Girl” | Women's Strawweight | 5-2-0 (W-L-D) | Inactive |
| Charalampos Grigoriou | “Ferocious” | Bantamweight | 8-5-0 (W-L-D) | Inactive |
| Charles Byrd | “Kid Dynamite” | Middleweight | 10-7-0 (W-L-D) | Inactive |
| Charles Johnson | “Inner G” | Flyweight | 19-9-0 (W-L-D) | Active |
| Charles Jourdain | “Air” | Bantamweight | 18-8-1 (W-L-D) | Active |
| Charles McCarthy | “Chainsaw” | Middleweight | 10-5-0 (W-L-D) | Inactive |
| Charles Oliveira | “Do Bronxs” | Lightweight | 37-11-0 (W-L-D) | Active |
| Charles Radtke | “Chuck Buffalo” | Welterweight | 12-5-0 (W-L-D) | Active |
| Charles Rosa | “Boston Strong” | Featherweight | 14-8-0 (W-L-D) | Active |
| Charlie Brenneman | “The Spaniard” | Lightweight | 19-8-0 (W-L-D) | Inactive |
| Charlie Campbell | “The Cannibal” | Lightweight | 9-3-0 (W-L-D) | Active |
| Charlie Ontiveros | “The American Bad Boy” | Lightweight | 11-9-0 (W-L-D) | Inactive |
| Charlie Valencia | Bantamweight | 12-7-0 (W-L-D) | Inactive | |
| Charlie Ward | “Relentless” | Welterweight | 3-3-0 (W-L-D) | Inactive |
| Chas Skelly | “The Scrapper” | Featherweight | 19-3-0 (W-L-D) | Inactive |
| Chase Gibson | Lightweight | 9-5-0 (W-L-D) | Inactive | |
| Chase Gormley | Heavyweight | 14-6-0 (W-L-D) | Inactive | |
| Chase Hooper | “The Dream” | Lightweight | 17-5-1 (W-L-D) | Active |
| Chase Sherman | “The Vanilla Gorilla” | Heavyweight | 16-12-0 (W-L-D) | Inactive |
| Chase Waldon | Middleweight | 11-2-0 (W-L-D) | Active | |
| Che Mills | “Beautiful” | Welterweight | 16-10-0 (W-L-D) | Inactive |
| Cheick Kongo | Heavyweight | 27-10-2 (W-L-D) | Inactive | |
| Chelsea Chandler | Women's Bantamweight | 7-4-0 (W-L-D) | Active | |
| Chelsea Hackett | Women's Flyweight | 3-1-1 (W-L-D) | Active | |
| Chepe Mariscal | “Machine Gun” | Featherweight | 18-7-0 (W-L-D) | Active |
| Cheyanne Vlismas | “The Warrior Princess” | Women's Strawweight | 7-3-0 (W-L-D) | Inactive |
| Cheyden Leialoha | “Steadfast” | Bantamweight | 6-0-0 (W-L-D) | Inactive |
| Chi Lewis-Parry | Heavyweight | 7-0-1 (W-L-D) | Inactive | |
| Chibwikem Onyenegecha | Middleweight | 5-0-0 (W-L-D) | Inactive | |
| Chico Camus | “The King” | Flyweight | 17-7-0 (W-L-D) | Inactive |
| Chidi Njokuani | “Bang Bang” | Welterweight | 25-12-0 (W-L-D) | Active |
| Chris Avila | Featherweight | 5-4-0 (W-L-D) | Inactive | |
| Chris Barnett | “Beastboy” | Heavyweight | 23-10-0 (W-L-D) | Inactive |
| Chris Beal | “The Real Deal” | Flyweight | 10-5-0 (W-L-D) | Inactive |
| Chris Birchler | Light Heavyweight | 7-4-0 (W-L-D) | Active | |
| Chris Brennan | “The Westside Strangler” | Welterweight | 21-13-1 (W-L-D) | Inactive |
| Chris Camozzi | Middleweight | 24-13-0 (W-L-D) | Inactive | |
| Chris Cariaso | “Kamikaze” | Flyweight | 17-8-0 (W-L-D) | Inactive |
| Chris Clements | “The Menace” | Welterweight | 12-6-0 (W-L-D) | Inactive |
| Chris Condo | Heavyweight | 0-1-0 (W-L-D) | Inactive | |
| Chris Cope | “C-Murder” | Welterweight | 8-4-0 (W-L-D) | Inactive |
| Chris Curtis | “Action-Man” | Welterweight | 32-13-0 (1 NC) | Active |
| Chris Daukaus | Light Heavyweight | 12-7-0 (W-L-D) | Active | |
| Chris De La Rocha | Heavyweight | 5-3-0 (W-L-D) | Inactive | |
| Chris Dempsey | Middleweight | 11-5-0 (W-L-D) | Inactive | |
| Chris Duncan | “The Problem” | Lightweight | 15-3-0 (W-L-D) | Active |
| Chris Ewert | “El Tanke” | Middleweight | 7-1-0 (W-L-D) | Inactive |
| Chris Fishgold | Featherweight | 18-4-1 (W-L-D) | Inactive | |
| Chris Gruetzemacher | “Gritz” | Lightweight | 15-5-0 (W-L-D) | Active |
| Chris Gutierrez | “El Guapo” | Bantamweight | 22-7-2 (W-L-D) | Active |
| Chris Haseman | “The Hammer” | Light Heavyweight | 20-17-0 (W-L-D) | Inactive |
| Chris Heatherly | “Stump” | Welterweight | 9-4-0 (W-L-D) | Inactive |
| Chris Hofmann | Welterweight | 9-2-0 (W-L-D) | Active | |
| Chris Holdsworth | “Holds It Down” | Bantamweight | 6-0-0 (W-L-D) | Inactive |
| Chris Indich | “The Savage” | Welterweight | 6-4-0 (W-L-D) | Inactive |
| Chris Kelades | “The Greek Assassin” | Flyweight | 9-3-0 (W-L-D) | Inactive |
| Chris Leben | “The Crippler” | Middleweight | 22-11-0 (W-L-D) | Inactive |
| Chris Ligouri | Middleweight | 2-2-0 (W-L-D) | Inactive | |
| Chris Liguori | 15-10-0 (W-L-D) | Inactive | ||
| Chris Lytle | “Lights Out” | Welterweight | 31-18-5 (W-L-D) | Inactive |
| Chris Padilla | “Taco” | Lightweight | 17-6-1 (W-L-D) | Active |
| Chris Price | “The Exorcist” | Middleweight | 19-4-0 (W-L-D) | Inactive |
| Chris Sanford | Middleweight | 5-1-0 (W-L-D) | Inactive | |
| Chris Saunders | Lightweight | 16-8-0 (W-L-D) | Inactive | |
| Chris Spang | “The Kiss” | Welterweight | 6-3-0 (W-L-D) | Inactive |
| Chris Tickle | “Bad Boy” | Lightweight | 9-9-0 (W-L-D) | Inactive |
| Chris Tuchscherer | “The Crowbar” | Heavyweight | 21-4-0 (W-L-D) | Inactive |
| Chris Wade | Lightweight | 12-3-0 (W-L-D) | Inactive | |
| Chris Weidman | “The All-American” | Middleweight | 16-8-0 (W-L-D) | Inactive |
| Chris Wilson | “The Professor” | Welterweight | 18-10-0 (W-L-D) | Inactive |
| Christian Aguilera | “The Beast” | Welterweight | 14-8-0 (W-L-D) | Inactive |
| Christian Colombo | “Godzilla” | Heavyweight | 8-3-1 (W-L-D) | Inactive |
| Christian Edwards | “Pain” | Light Heavyweight | 8-5-0 (W-L-D) | Active |
| Christian Leroy Duncan | “CLD” | Middleweight | 15-2-0 (W-L-D) | Active |
| Christian Lohsen | Lightweight | 4-2-0 (W-L-D) | Active | |
| Christian Morecraft | Heavyweight | 8-3-0 (W-L-D) | Inactive | |
| Christian Ocon | “The Don” | Bantamweight | 2-1-0 (W-L-D) | Active |
| Christian Rodriguez | Featherweight | 12-4-0 (W-L-D) | Active | |
| Christian Wellisch | “The Hungarian Nightmare” | Light Heavyweight | 8-5-0 (W-L-D) | Inactive |
| Christina Marks | Women's Flyweight | 8-9-0 (W-L-D) | Inactive | |
| Christophe Leininger | Lightweight | 0-0-0 (W-L-D) | Inactive | |
| Christophe Leninger | 3-4-0 (W-L-D) | Inactive | ||
| Christophe Midoux | “The French Hurricane” | Heavyweight | 9-5-0 (W-L-D) | Inactive |
| Christopher Alvidrez | Welterweight | 7-1-0 (W-L-D) | Active | |
| Christos Giagos | “The Spartan” | Lightweight | 20-12-0 (W-L-D) | Inactive |
| Chuck Liddell | “The Iceman” | Light Heavyweight | 21-8-0 (W-L-D) | Inactive |
| Chuck O'Neil | “Cold Steel” | Welterweight | 17-9-0 (W-L-D) | Inactive |
| Cindy Dandois | “Battle Cat” | Women's Bantamweight | 8-3-0 (W-L-D) | Inactive |
| Ciryl Gane | “Bon Gamin” | Heavyweight | 14-2-0 (W-L-D) | Active |
| Claude Patrick | “The Prince” | Welterweight | 14-2-0 (W-L-D) | Inactive |
| Claudia Gadelha | “Claudinha” | Women's Strawweight | 18-5-0 (W-L-D) | Inactive |
| Claudia Leite | Women's Bantamweight | 8-3-0 (W-L-D) | Active | |
| Claudio Puelles | “Prince of Peru” | Lightweight | 13-5-0 (W-L-D) | Active |
| Claudio Ribeiro | Middleweight | 11-5-0 (W-L-D) | Inactive | |
| Claudio Silva | “Hannibal” | Welterweight | 14-4-0 (W-L-D) | Inactive |
| Clay Collard | “Cassius” | Featherweight | 14-7-0 (W-L-D) | Inactive |
| Clay Guida | “The Carpenter” | Lightweight | 38-22-0 (W-L-D) | Inactive |
| Clay Harvison | “Heavy Metal” | Welterweight | 13-6-0 (W-L-D) | Inactive |
| Clayton Carpenter | Flyweight | 8-3-0 (W-L-D) | Active | |
| Clifford Starks | Middleweight | 13-3-0 (W-L-D) | Inactive | |
| Clint Hester | “Headbussa” | Light Heavyweight | 11-6-0 (W-L-D) | Inactive |
| Cody Belisle | “Bodacious” | Light Heavyweight | 0-0-0 (W-L-D) | Active |
| Cody Brundage | Middleweight | 12-9-1 (W-L-D) | Active | |
| Cody Chovancek | Bantamweight | 9-0-0 (W-L-D) | Active | |
| Cody Donovan | “Donnybrook” | Light Heavyweight | 8-5-0 (W-L-D) | Inactive |
| Cody Durden | “Custom Made” | Flyweight | 18-11-1 (W-L-D) | Active |
| Cody East | “The Freight Train” | Heavyweight | 12-3-0 (W-L-D) | Inactive |
| Cody Garbrandt | “No Love” | Bantamweight | 15-8-0 (W-L-D) | Active |
| Cody Gibson | “The Renegade” | Bantamweight | 22-12-0 (W-L-D) | Active |
| Cody Haddon | Bantamweight | 9-1-0 (W-L-D) | Active | |
| Cody McKenzie | Lightweight | 16-10-0 (W-L-D) | Inactive | |
| Cody Pfister | “The Fist” | Lightweight | 13-6-1 (W-L-D) | Inactive |
| Cody Stamann | “Spartan” | Bantamweight | 21-8-1 (W-L-D) | Inactive |
| Colby Covington | “Chaos” | Welterweight | 17-5-0 (W-L-D) | Inactive |
| Colby Thicknesse | “Slickness” | Bantamweight | 9-1-0 (W-L-D) | Active |
| Cole Escovedo | “Apache Kid” | Bantamweight | 17-9-0 (W-L-D) | Inactive |
| Cole Miller | “Magrinho” | Featherweight | 21-11-0 (1 NC) | Inactive |
| Cole Smith | “The Cole Train” | Bantamweight | 7-2-0 (W-L-D) | Inactive |
| Cole Williams | “Havoc” | Welterweight | 11-3-0 (W-L-D) | Inactive |
| Colin Fletcher | “The Freakshow” | Lightweight | 14-8-0 (W-L-D) | Inactive |
| Colin Robinson | “Big C” | Heavyweight | 10-12-0 (W-L-D) | Inactive |
| Collin Anglin | Featherweight | 8-3-0 (W-L-D) | Inactive | |
| Collin Hart | Middleweight | 6-3-1 (W-L-D) | Inactive | |
| Collin Huckbody | “All In” | Middleweight | 8-2-0 (W-L-D) | Inactive |
| Coltin Cole | “The Truth” | Heavyweight | 4-5-0 (W-L-D) | Active |
| Colton Smith | Lightweight | 7-4-0 (W-L-D) | Inactive | |
| Connor Matthews | “The Controller” | Featherweight | 7-4-0 (W-L-D) | Inactive |
| Conor McGregor | “The Notorious” | Welterweight | 22-7-0 (W-L-D) | Active |
| Constantinos Philippou | 13-5-0 (W-L-D) | Inactive | ||
| Corey Anderson | “Overtime” | Light Heavyweight | 14-5-0 (W-L-D) | Inactive |
| Corey Hill | “The Real Deal” | Lightweight | 6-9-0 (W-L-D) | Inactive |
| Corinne Laframboise | Women's Flyweight | 8-5-0 (W-L-D) | Active | |
| Cortavious Romious | Bantamweight | 9-4-0 (W-L-D) | Inactive | |
| Cortney Casey | “Cast Iron” | Women's Flyweight | 10-10-0 (W-L-D) | Active |
| Cory Corbin | “Hamma” | Heavyweight | 0-0-0 (W-L-D) | Active |
| Cory Hendricks | Light Heavyweight | 3-1-0 (W-L-D) | Inactive | |
| Cory McKenna | “Poppins” | Women's Strawweight | 8-4-0 (W-L-D) | Inactive |
| Cory Sandhagen | Bantamweight | 18-7-0 (W-L-D) | Active | |
| Cory Walmsley | “Hard Cor” | Light Heavyweight | 8-2-0 (W-L-D) | Inactive |
| Costas Philippou | Middleweight | 13-5-0 (W-L-D) | Inactive | |
| Court McGee | “The Crusher” | Welterweight | 23-14-0 (W-L-D) | Active |
| Courtney Turner | Lightweight | 0-3-0 (W-L-D) | Inactive | |
| Crafton Wallace | “Blaze” | Middleweight | 18-6-1 (W-L-D) | Inactive |
| Craig White | “The Thundercat” | Welterweight | 14-9-0 (W-L-D) | Inactive |
| Cris Cyborg | Featherweight | 21-2-0 (W-L-D) | Inactive | |
| Cristian Quinonez | “Problema” | Bantamweight | 19-5-0 (W-L-D) | Active |
| Cristiane Justino | 21-2-0 (W-L-D) | Inactive | ||
| Cristiano Marcello | Lightweight | 13-6-0 (W-L-D) | Inactive | |
| Cristina Stanciu | “Barbie” | Women's Strawweight | 5-2-0 (W-L-D) | Inactive |
| Cub Swanson | Featherweight | 31-14-0 (W-L-D) | Inactive | |
| Cung Le | Middleweight | 9-3-0 (W-L-D) | Inactive | |
| Curt Warburton | “The War” | Lightweight | 13-6-0 (W-L-D) | Inactive |
| Curtis Blaydes | “Razor” | Heavyweight | 19-6-0 (W-L-D) | Active |
| Curtis Millender | “Curtious” | Welterweight | 17-5-0 (W-L-D) | Inactive |
| Curtis Stout | Middleweight | 11-12-1 (W-L-D) | Inactive | |
| Cynthia Calvillo | Women's Strawweight | 9-6-1 (W-L-D) | Active | |
| Cyril Asker | “Silverback” | Heavyweight | 9-4-0 (W-L-D) | Inactive |
| Cyrille Diabate | “The Snake” | Light Heavyweight | 19-10-1 (W-L-D) | Inactive |
| Da Woon Jung | “Sseda” | Light Heavyweight | 15-6-1 (W-L-D) | Inactive |
| Da'Mon Blackshear | “The Monster” | Bantamweight | 17-8-1 (W-L-D) | Active |
| DaMarques Johnson | “Darkness” | Welterweight | 15-15-0 (W-L-D) | Inactive |
| Daermisi Zhawupasi | Bantamweight | 9-2-0 (W-L-D) | Inactive | |
| Daichi Abe | Welterweight | 6-2-0 (W-L-D) | Inactive | |
| Daiju Takase | Welterweight | 12-15-2 (W-L-D) | Inactive | |
| Dakota Bush | “Hairy” | Lightweight | 8-4-0 (W-L-D) | Inactive |
| Dakota Hope | “Huracán” | Lightweight | 11-2-0 (W-L-D) | Active |
| Dakota Weigher | “Iron Slap” | Light Heavyweight | 0-0-0 (W-L-D) | Active |
| Dalcha Lungiambula | “Champion” | Middleweight | 11-6-0 (W-L-D) | Inactive |
| Dale Hartt | Lightweight | 6-3-0 (W-L-D) | Inactive | |
| Dallas Marron | “El Tigre” | Welterweight | 0-0-0 (W-L-D) | Active |
| Damacio Page | “The Angel of Death” | 19-10-0 (W-L-D) | Inactive | |
| Damian Grabowski | “The Polish Pitbull” | Heavyweight | 20-5-0 (W-L-D) | Inactive |
| Damian Pinas | “The Baba Yaga” | Middleweight | 10-1-0 (W-L-D) | Active |
| Damian Rzepecki | Lightweight | 10-0-0 (W-L-D) | Active | |
| Damian Stasiak | “Webster” | Bantamweight | 10-6-0 (W-L-D) | Inactive |
| Damien Anderson | “Demon Hands” | Featherweight | 5-1-0 (W-L-D) | Active |
| Damien Brown | “Beatdown” | Lightweight | 17-12-0 (W-L-D) | Inactive |
| Damir Hadžović | “The Bosnian Bomber” | Lightweight | 14-8-0 (W-L-D) | Active |
| Damir Ismagulov | “Qazaq” | Lightweight | 24-3-0 (W-L-D) | Inactive |
| Damon Jackson | “The Leech” | Lightweight | 23-8-1 (W-L-D) | Inactive |
| Dan Argueta | 9-3-0 (W-L-D) | Inactive | ||
| Dan Argueta | “The Determined” | Bantamweight | 9-3-0 (W-L-D) | Inactive |
| Dan Barrera | Welterweight | 3-1-0 (W-L-D) | Inactive | |
| Dan Bobish | 17-9-0 (W-L-D) | Inactive | ||
| Dan Christison | “The Sandman” | Heavyweight | 20-7-0 (W-L-D) | Inactive |
| Dan Cramer | Welterweight | 11-4-0 (W-L-D) | Inactive | |
| Dan Downes | “Danny Boy” | Lightweight | 8-3-0 (W-L-D) | Inactive |
| Dan Evensen | “The Viking” | Heavyweight | 11-4-0 (W-L-D) | Inactive |
| Dan Hardy | “The Outlaw” | Welterweight | 25-10-0 (W-L-D) | Inactive |
| Dan Henderson | “Hendo” | Middleweight | 32-15-0 (W-L-D) | Inactive |
| Dan Hooker | “The Hangman” | Lightweight | 24-14-0 (W-L-D) | Active |
| Dan Ige | “100 Grand” | Featherweight | 19-10-0 (W-L-D) | Inactive |
| Dan Lauzon | “The Upgrade” | Lightweight | 17-6-0 (W-L-D) | Inactive |
| Dan Miller | Middleweight | 14-8-0 (W-L-D) | Inactive | |
| Dan Moret | “The Hitman” | Lightweight | 13-6-0 (W-L-D) | Inactive |
| Dan Severn | “The Beast” | Heavyweight | 101-19-1 (W-L-D) | Inactive |
| Dan Stittgen | “The Anvil” | Welterweight | 12-5-0 (W-L-D) | Inactive |
| Daniel Barez | Flyweight | 17-8-0 (W-L-D) | Inactive | |
| Daniel Bobish | Heavyweight | 0-0-0 (W-L-D) | Inactive | |
| Daniel Cormier | “DC” | Heavyweight | 22-3-0 (W-L-D) | Inactive |
| Daniel Frunza | Welterweight | 9-4-0 (W-L-D) | Active | |
| Daniel Gallemore | Heavyweight | 7-3-0 (W-L-D) | Inactive | |
| Daniel Jolly | “Werewolf of Texas” | Light Heavyweight | 5-3-0 (W-L-D) | Inactive |
| Daniel Kelly | Middleweight | 13-4-0 (W-L-D) | Inactive | |
| Daniel Lacerda | “Miojo” | Flyweight | 11-6-0 (W-L-D) | Active |
| Daniel Marcos | “Soncora” | Bantamweight | 18-1-0 (1 NC) | Inactive |
| Daniel Omielanczuk | Heavyweight | 19-8-1 (W-L-D) | Inactive | |
| Daniel Pereira | Middleweight | 9-2-0 (W-L-D) | Inactive | |
| Daniel Pineda | “The Pit” | Featherweight | 28-17-0 (1 NC) | Inactive |
| Daniel Roberts | “Ninja” | Welterweight | 15-7-0 (W-L-D) | Inactive |
| Daniel Rodriguez | “D-Rod” | Welterweight | 20-5-0 (W-L-D) | Active |
| Daniel Santos | “Willycat” | Featherweight | 14-3-0 (W-L-D) | Active |
| Daniel Sarafian | 10-6-0 (W-L-D) | Inactive | ||
| Daniel Spitz | “Daddy Long Legs” | Heavyweight | 6-3-0 (W-L-D) | Inactive |
| Daniel Spohn | “Dragon” | Light Heavyweight | 15-6-0 (W-L-D) | Active |
| Daniel Swain | Featherweight | 20-10-1 (W-L-D) | Active | |
| Daniel Teymur | “Kid Dynamite” | Featherweight | 7-4-0 (W-L-D) | Inactive |
| Daniel Zellhuber | “Golden Boy” | Lightweight | 15-4-0 (W-L-D) | Active |
| Danielle Taylor | “Dynamite” | Women's Strawweight | 9-4-0 (W-L-D) | Inactive |
| Daniil Donchenko | Welterweight | 15-2-0 (W-L-D) | Active | |
| Danillo Villefort | “Indio” | Welterweight | 15-5-0 (W-L-D) | Inactive |
| Danilo Belluardo | “Caterpillar” | Lightweight | 12-5-0 (W-L-D) | Inactive |
| Danilo Marques | Light Heavyweight | 11-4-0 (W-L-D) | Inactive | |
| Danilo Suzart | Heavyweight | 9-2-0 (W-L-D) | Active | |
| Danny Abbadi | “The Assassin” | Lightweight | 4-6-0 (W-L-D) | Inactive |
| Danny Barlow | “LeftHand2God” | Middleweight | 9-2-0 (W-L-D) | Inactive |
| Danny Castillo | “Last Call” | Lightweight | 17-10-0 (W-L-D) | Inactive |
| Danny Chavez | “The Colombian Warrior” | Featherweight | 11-5-1 (W-L-D) | Inactive |
| Danny Downes | 8-3-0 (W-L-D) | Inactive | ||
| Danny Henry | “The Hatchet” | Featherweight | 12-4-0 (W-L-D) | Active |
| Danny Martinez | “The Gremlin” | Flyweight | 21-8-0 (W-L-D) | Inactive |
| Danny Mitchell | “The Cheesecake Assassin” | Welterweight | 19-9-1 (W-L-D) | Inactive |
| Danny Roberts | “Hot Chocolate” | Welterweight | 18-8-0 (W-L-D) | Inactive |
| Danny Sabatello | Bantamweight | 9-1-0 (W-L-D) | Active | |
| Danny Silva | “El Puma” | Featherweight | 11-2-0 (W-L-D) | Active |
| Dante Rivera | Middleweight | 16-7-0 (W-L-D) | Inactive | |
| Danyelle Wolf | Featherweight | 1-1-0 (W-L-D) | Inactive | |
| Danylo Voievodkin | Heavyweight | 7-0-0 (W-L-D) | Inactive | |
| Daria Zhelezniakova | “Iron Lady” | Women's Bantamweight | 10-3-0 (W-L-D) | Active |
| Darian Weeks | Welterweight | 5-3-0 (W-L-D) | Inactive | |
| Darko Stosic | Light Heavyweight | 13-4-0 (W-L-D) | Inactive | |
| Daron Cruickshank | “Detroit Superstar” | Lightweight | 18-10-0 (1 NC) | Inactive |
| Darrel Gholar | Middleweight | 5-6-0 (W-L-D) | Inactive | |
| Darrell Horcher | “The Saint” | Lightweight | 13-4-0 (W-L-D) | Inactive |
| Darrell Montague | “Mongoose” | Flyweight | 13-5-0 (W-L-D) | Inactive |
| Darren Elkins | “The Damage” | Featherweight | 29-12-0 (W-L-D) | Active |
| Darren Stewart | “The Dentist” | Light Heavyweight | 12-8-0 (1 NC) | Inactive |
| Darren Till | “The Gorilla” | Middleweight | 18-5-1 (W-L-D) | Inactive |
| Darren Uyenoyama | “BC” | Flyweight | 10-6-0 (W-L-D) | Inactive |
| Darrick Minner | Featherweight | 26-14-0 (W-L-D) | Inactive | |
| Darrill Schoonover | “The Boss” | Heavyweight | 14-8-0 (W-L-D) | Inactive |
| Darrius Flowers | “Beastmode” | Lightweight | 13-8-1 (W-L-D) | Active |
| Dashawn Boatwright | “Buck, the 400-pound Silverback” | Light Heavyweight | 3-1-0 (W-L-D) | Active |
| Dashon Johnson | “Flyboy” | Featherweight | 9-2-0 (W-L-D) | Inactive |
| Dave Beneteau | Heavyweight | 6-5-1 (W-L-D) | Inactive | |
| Dave Berry | 0-1-0 (W-L-D) | Inactive | ||
| Dave Galera | “Scarecrow” | Bantamweight | 5-1-0 (W-L-D) | Inactive |
| Dave Herman | Heavyweight | 22-6-0 (W-L-D) | Inactive | |
| Dave Kaplan | “Diamond” | Lightweight | 3-3-0 (W-L-D) | Inactive |
| Dave Menne | “The Warrior” | Welterweight | 45-17-2 (W-L-D) | Inactive |
| Dave Strasser | Welterweight | 25-8-0 (W-L-D) | Inactive | |
| Davey Grant | “Dangerous” | Bantamweight | 18-8-0 (W-L-D) | Active |
| Davi Costa | Flyweight | 0-0-0 (W-L-D) | Active | |
| Davi Ramos | “Tasmanian Devil” | Lightweight | 10-4-0 (W-L-D) | Inactive |
| David Abbott | 10-15-0 (W-L-D) | Inactive | ||
| David Baron | Lightweight | 17-4-1 (W-L-D) | Inactive | |
| David Bielkheden | Lightweight | 24-12-0 (W-L-D) | Inactive | |
| David Branch | Middleweight | 22-6-0 (W-L-D) | Inactive | |
| David Dodd | Middleweight | 4-7-0 (W-L-D) | Inactive | |
| David Dvorak | “Undertaker” | Flyweight | 20-6-0 (W-L-D) | Active |
| David Heath | Light Heavyweight | 18-7-0 (W-L-D) | Inactive | |
| David Hood | 1-3-0 (W-L-D) | Inactive | ||
| David Kaplan | 3-4-0 (W-L-D) | Inactive | ||
| David Lee | Lightweight | 12-10-0 (W-L-D) | Inactive | |
| David Levicki | 1-3-0 (W-L-D) | Inactive | ||
| David Loiseau | “The Crow” | Middleweight | 23-11-0 (W-L-D) | Inactive |
| David Martinez | Bantamweight | 14-1-0 (W-L-D) | Active | |
| David Michaud | “BullDawg” | Lightweight | 11-3-0 (W-L-D) | Inactive |
| David Mitchell | “Daudi” | Welterweight | 22-7-0 (W-L-D) | Inactive |
| David Onama | Featherweight | 14-3-0 (W-L-D) | Active | |
| David Roberts | 5-8-0 (W-L-D) | Inactive | ||
| David Terrell | “The Soul Assassin” | Middleweight | 6-2-0 (W-L-D) | Inactive |
| David Teymur | Lightweight | 8-2-0 (W-L-D) | Active | |
| David Velasquez | Lightweight | 10-10-0 (W-L-D) | Inactive | |
| David Zawada | “Sagat” | Welterweight | 17-7-0 (W-L-D) | Inactive |
| Dayana da Silva Santos | Women's Bantamweight | 0-0-0 (W-L-D) | Inactive | |
| DeAnna Bennett | “Vitamin D” | Women's Flyweight | 8-3-1 (W-L-D) | Inactive |
| Dean Barry | “The Sniper” | Welterweight | 4-2-0 (W-L-D) | Inactive |
| Dean Lister | “The Boogeyman” | Middleweight | 13-7-0 (W-L-D) | Inactive |
| Deiveson Figueiredo | “Deus da Guerra” | Bantamweight | 25-7-1 (W-L-D) | Active |
| Delson Heleno | “Pé De Chumbo” | Middleweight | 29-10-0 (W-L-D) | Inactive |
| Demetrious Johnson | “Mighty Mouse” | Flyweight | 27-3-1 (W-L-D) | Inactive |
| Demian Maia | Welterweight | 28-11-0 (W-L-D) | Inactive | |
| Denis Kang | Middleweight | 35-16-2 (W-L-D) | Inactive | |
| Denis Stojnic | “The Menace” | Heavyweight | 13-3-0 (W-L-D) | Inactive |
| Denis Tiuliulin | Middleweight | 10-10-0 (W-L-D) | Active | |
| Denise Gomes | “Dee” | Women's Strawweight | 12-3-0 (W-L-D) | Active |
| Dennis Bermudez | “The Menace” | Lightweight | 17-9-0 (W-L-D) | Inactive |
| Dennis Bryant | “The Beard” | Light Heavyweight | 5-2-0 (W-L-D) | Inactive |
| Dennis Buzukja | “The Great” | Featherweight | 12-6-0 (W-L-D) | Active |
| Dennis Hallman | “Superman” | Lightweight | 53-20-2 (W-L-D) | Inactive |
| Dennis Siver | Featherweight | 23-11-0 (W-L-D) | Inactive | |
| Denys Bondar | “Psycho” | Flyweight | 14-5-0 (W-L-D) | Active |
| Denzel Freeman | “Luke Fox” | Heavyweight | 7-2-0 (W-L-D) | Active |
| Dequan Townsend | “The Tarantula” | Middleweight | 21-12-0 (W-L-D) | Inactive |
| Derek Brunson | “The 1” | Middleweight | 23-9-0 (W-L-D) | Inactive |
| Derek Downey | “The Gentleman” | Middleweight | 11-4-0 (W-L-D) | Inactive |
| Deron Winn | Middleweight | 7-3-0 (W-L-D) | Inactive | |
| Derrick Krantz | “D-Rock” | Welterweight | 22-12-0 (W-L-D) | Inactive |
| Derrick Lewis | “The Black Beast” | Heavyweight | 29-14-0 (W-L-D) | Active |
| Derrick Noble | “The Eraser” | Welterweight | 27-15-1 (W-L-D) | Inactive |
| Desmond Green | “The Predator” | Lightweight | 23-8-0 (W-L-D) | Inactive |
| Desmond Torres | Bantamweight | 7-2-0 (W-L-D) | Inactive | |
| Devin Clark | “Brown Bear” | Light Heavyweight | 14-9-0 (W-L-D) | Active |
| Devin Powell | Lightweight | 9-4-0 (W-L-D) | Inactive | |
| Devin Smyth | Welterweight | 4-2-0 (W-L-D) | Active | |
| Devonte Smith | “King Kage” | Lightweight | 11-4-0 (W-L-D) | Inactive |
| Dhiego Lima | Welterweight | 17-9-0 (W-L-D) | Inactive | |
| Diana Belbita | “The Warrior Princess” | Women's Flyweight | 15-10-0 (W-L-D) | Inactive |
| Diego Brandao | “DB” | Featherweight | 22-11-0 (W-L-D) | Inactive |
| Diego Ferreira | Lightweight | 19-7-0 (W-L-D) | Active | |
| Diego Henrique da Silva | “Gaucho” | Middleweight | 8-4-0 (W-L-D) | Active |
| Diego Lopes | Featherweight | 28-8-0 (W-L-D) | Active | |
| Diego Nunes | “The Gun” | Featherweight | 19-7-0 (W-L-D) | Inactive |
| Diego Rivas | “Pitbull” | Bantamweight | 10-2-0 (W-L-D) | Inactive |
| Diego Sanchez | “Nightmare” | Welterweight | 31-13-0 (W-L-D) | Inactive |
| Diego Saraiva | “The Octopus” | Lightweight | 22-20-1 (W-L-D) | Inactive |
| Dieusel Berto | 0-3-0 (W-L-D) | Inactive | ||
| Dileno Lopes | Bantamweight | 19-3-0 (W-L-D) | Inactive | |
| Din Thomas | Lightweight | 26-9-0 (W-L-D) | Inactive | |
| Ding Meng | Welterweight | 35-10-0 (W-L-D) | Active | |
| Dinis Paiva | Featherweight | 13-8-0 (W-L-D) | Active | |
| Dion Staring | “Soldier” | Heavyweight | 35-14-0 (W-L-D) | Inactive |
| Dione Barbosa | “The Witch” | Women's Flyweight | 10-4-0 (W-L-D) | Active |
| Diyar Nurgozhay | Light Heavyweight | 11-2-0 (W-L-D) | Active | |
| Djorden Santos | “Shakur” | Middleweight | 11-3-0 (W-L-D) | Active |
| Dmitrei Stepanov | Heavyweight | 0-0-0 (W-L-D) | Inactive | |
| Dmitri Stepanov | 0-1-0 (W-L-D) | Inactive | ||
| Dmitrii Smoliakov | “The Lifeguard” | Heavyweight | 9-3-0 (W-L-D) | Inactive |
| Dmitry Poberezhets | Heavyweight | 24-5-1 (W-L-D) | Inactive | |
| Dmitry Sosnovskiy | Heavyweight | 11-0-0 (W-L-D) | Inactive | |
| Dokonjonosuke Mishima | Lightweight | 21-7-2 (W-L-D) | Inactive | |
| Dom Mar Fan | “Street Buddha” | Lightweight | 9-3-0 (W-L-D) | Active |
| Domingo Pilarte | “Son of Fire” | Bantamweight | 8-3-0 (W-L-D) | Inactive |
| Dominic Waters | “Shonuff” | Welterweight | 9-5-0 (W-L-D) | Inactive |
| Dominick Cruz | “The Dominator” | Bantamweight | 24-4-0 (W-L-D) | Inactive |
| Dominick Reyes | “The Devastator” | Light Heavyweight | 16-5-0 (W-L-D) | Active |
| Dominik Melendez | “The Menace” | Middleweight | 0-0-0 (W-L-D) | Active |
| Dominique Steele | “Non-Stop Action-Packed” Dom T. Steele” | Welterweight | 14-9-0 (W-L-D) | Inactive |
| Don Frye | “The Predator” | Heavyweight | 20-9-1 (W-L-D) | Inactive |
| Don Madge | “Magic Man” | Lightweight | 9-3-1 (W-L-D) | Inactive |
| Don Shainis | “Shameless” | Featherweight | 12-5-0 (W-L-D) | Inactive |
| Don'Tale Mayes | “Lord Kong” | Heavyweight | 11-9-0 (W-L-D) | Inactive |
| Donald Cerrone | “Cowboy” | Welterweight | 36-17-0 (W-L-D) | Inactive |
| Donavan Beard | Middleweight | 0-1-0 (W-L-D) | Active | |
| Donavon Frelow | Bantamweight | 6-3-0 (W-L-D) | Inactive | |
| Dong Hyun Kim | “The Stun Gun” | Welterweight | 22-4-1 (W-L-D) | Inactive |
| Dong Hyun Ma | “Maestro” | Lightweight | 16-11-3 (W-L-D) | Inactive |
| DongHun Choi | Flyweight | 9-0-0 (W-L-D) | Active | |
| Dongi Yang | “The Ox” | Middleweight | 13-3-0 (W-L-D) | Inactive |
| Donnie Chappell | Lightweight | 0-1-0 (W-L-D) | Inactive | |
| Donny Walker | “Eagle Eye” | 15-10-0 (W-L-D) | Inactive | |
| Donte Johnson | “Lock Jaw” | Middleweight | 8-0-0 (W-L-D) | Active |
| Dooho Choi | “The Korean Superboy” | Featherweight | 17-4-1 (W-L-D) | Active |
| Dorian Price | Welterweight | 8-5-0 (W-L-D) | Inactive | |
| Doug Evans | Lightweight | 13-10-0 (W-L-D) | Inactive | |
| Doug Marshall | “The Rhino” | Light Heavyweight | 18-8-0 (W-L-D) | Inactive |
| Douglas Silva de Andrade | “D Silva” | Featherweight | 29-7-0 (W-L-D) | Active |
| Drakkar Klose | Lightweight | 16-3-1 (W-L-D) | Active | |
| Drako Rodriguez | Bantamweight | 7-3-0 (W-L-D) | Inactive | |
| Drew Dober | Lightweight | 29-15-0 (W-L-D) | Active | |
| Drew Fickett | “The Master” | Welterweight | 42-21-0 (W-L-D) | Inactive |
| Drew McFedries | “The Massacre” | Middleweight | 12-7-0 (W-L-D) | Inactive |
| Dricus Du Plessis | “Stillknocks” | Middleweight | 24-3-0 (W-L-D) | Active |
| Duane Cason | Heavyweight | 0-0-0 (W-L-D) | Inactive | |
| Duane Ludwig | “Bang” | Welterweight | 21-14-0 (W-L-D) | Inactive |
| Duda Santana | “Cowboyzinha” | Women's Bantamweight | 3-1-0 (W-L-D) | Inactive |
| Dustin Hazelett | Lightweight | 12-7-0 (W-L-D) | Inactive | |
| Dustin Jacoby | “The Hanyak” | Light Heavyweight | 22-9-1 (W-L-D) | Active |
| Dustin Joynson | Heavyweight | 5-0-0 (W-L-D) | Active | |
| Dustin Kimura | “The Diamond” | Bantamweight | 11-3-0 (W-L-D) | Inactive |
| Dustin Neace | “The Beast” | Featherweight | 25-21-1 (W-L-D) | Inactive |
| Dustin Ortiz | Flyweight | 19-8-0 (W-L-D) | Inactive | |
| Dustin Pague | “The Disciple” | Bantamweight | 12-11-0 (W-L-D) | Inactive |
| Dustin Poirier | “The Diamond” | Lightweight | 30-10-0 (W-L-D) | Active |
| Dustin Stoltzfus | Middleweight | 16-8-0 (W-L-D) | Active | |
| Duško Todorović | “Thunder” | Middleweight | 13-6-0 (W-L-D) | Active |
| Dwayne Cason | 1-1-0 (W-L-D) | Inactive | ||
| Dwight Grant | “The Body Snatcher” | Middleweight | 11-6-0 (W-L-D) | Inactive |
| Dwight Joseph | Bantamweight | 5-0-0 (W-L-D) | Inactive | |
| Dylan Andrews | “The Villain” | Middleweight | 18-7-0 (W-L-D) | Inactive |
| Dylan Budka | “The Mindless Hulk” | Middleweight | 7-5-0 (W-L-D) | Inactive |
| Dylan Lockard | Featherweight | 6-2-0 (W-L-D) | Inactive | |
| Dylan Potter | Heavyweight | 10-6-0 (W-L-D) | Inactive | |
| Dylan Salvador | Lightweight | 5-2-0 (W-L-D) | Active | |
| Ebenezer Braga | Middleweight | 0-0-0 (W-L-D) | Inactive | |
| Ebenezer Fontes Braga | 13-7-2 (W-L-D) | Inactive | ||
| Ed Herman | “Short Fuse” | Light Heavyweight | 27-16-0 (W-L-D) | Inactive |
| Eddie Alvarez | “The Underground King” | Lightweight | 29-6-0 (1 NC) | Inactive |
| Eddie Gordon | “Truck” | Middleweight | 8-4-0 (W-L-D) | Inactive |
| Eddie Mendez | Middleweight | 8-3-1 (W-L-D) | Inactive | |
| Eddie Ruiz | Lightweight | 1-1-0 (W-L-D) | Inactive | |
| Eddie Sanchez | “The Manic Hispanic” | Heavyweight | 15-8-0 (W-L-D) | Inactive |
| Eddie Wineland | Bantamweight | 24-16-1 (W-L-D) | Inactive | |
| Eddie Yagin | “The Filipino Phenom” | Featherweight | 16-7-1 (W-L-D) | Inactive |
| Edgar Chairez | “Puro Chicali” | Flyweight | 14-6-0 (W-L-D) | Active |
| Edgar Garcia | Welterweight | 14-5-0 (W-L-D) | Inactive | |
| Edilberto Crocota | Welterweight | 10-1-1 (W-L-D) | Inactive | |
| Edilberto De Oliveira | 29-15-2 (W-L-D) | Inactive | ||
| Edimilson Souza | 15-5-0 (W-L-D) | Inactive | ||
| Edivan Santos | Heavyweight | 12-3-1 (W-L-D) | Active | |
| Edmen Shahbazyan | “The Golden Boy” | Middleweight | 16-6-0 (W-L-D) | Active |
| Ednaldo Oliveira | “Lula” | Light Heavyweight | 17-3-1 (W-L-D) | Inactive |
| Edson Barboza | “Junior” | Lightweight | 24-14-0 (W-L-D) | Active |
| Edson Gomez | Welterweight | 6-2-0 (W-L-D) | Inactive | |
| Eduarda Moura | “Ronda” | Women's Flyweight | 12-2-0 (W-L-D) | Active |
| Eduardo Matias Torres | Bantamweight | 0-1-0 (W-L-D) | Active | |
| Eduardo Neves | Heavyweight | 7-2-0 (W-L-D) | Active | |
| Edward Faaloloto | “Falo” | Lightweight | 2-5-0 (W-L-D) | Inactive |
| Edwin Dewees | “Babyface” | Middleweight | 38-17-0 (W-L-D) | Inactive |
| Edwin Figueroa | “El Feroz” | Bantamweight | 9-5-0 (W-L-D) | Inactive |
| Efrain Escudero | “Hecho en México” | Lightweight | 28-12-0 (W-L-D) | Inactive |
| Eiji Mitsuoka | Featherweight | 18-9-2 (W-L-D) | Inactive | |
| Eldo Xavier Dias | 0-1-0 (W-L-D) | Inactive | ||
| Eli Aronov | Middleweight | 6-1-0 (W-L-D) | Active | |
| Elias Garcia | Flyweight | 6-2-0 (W-L-D) | Inactive | |
| Elias Silverio | “Xuxu” | Lightweight | 13-3-0 (W-L-D) | Inactive |
| Elias Theodorou | “The Spartan” | Middleweight | 16-3-0 (W-L-D) | Inactive |
| Elias Urbina | Middleweight | 3-1-0 (W-L-D) | Active | |
| Elijah Smith | “Swift” | Bantamweight | 10-1-0 (W-L-D) | Active |
| Eliot Marshall | “The Fire” | Light Heavyweight | 10-4-0 (W-L-D) | Inactive |
| Elise Reed | Women's Strawweight | 8-5-0 (W-L-D) | Active | |
| Elisha Ellison | “The Snack Panther” | Heavyweight | 5-3-0 (W-L-D) | Active |
| Elizabeth Phillips | Women's Bantamweight | 6-6-0 (W-L-D) | Inactive | |
| Elizeu Zaleski dos Santos | “Capoeira” | Welterweight | 25-10-1 (W-L-D) | Inactive |
| Elves Brener | Lightweight | 16-6-0 (W-L-D) | Active | |
| Elvis Mutapcic | “The King” | Middleweight | 15-6-1 (W-L-D) | Inactive |
| Elvis Sinosic | “The King of Rock n Rumble” | Light Heavyweight | 7-11-2 (W-L-D) | Inactive |
| Emil Meek | “Valhalla” | Welterweight | 9-5-1 (W-L-D) | Inactive |
| Emiliano Sordi | “He-Man” | Light Heavyweight | 16-7-0 (W-L-D) | Inactive |
| Emilio Cuellar | Flyweight | 6-1-0 (W-L-D) | Active | |
| Emily Ducote | “Gordinha” | Women's Strawweight | 13-9-0 (W-L-D) | Inactive |
| Emily Kagan | 3-3-0 (W-L-D) | Inactive | ||
| Emily Peters Kagan | Women's Strawweight | 3-3-0 (W-L-D) | Inactive | |
| Emily Whitmire | “Spitfire” | Women's Flyweight | 4-5-0 (W-L-D) | Inactive |
| Emmanuel Yarborough | 1-2-0 (W-L-D) | Inactive | ||
| Emmanuel Yarbrough | 0-0-0 (W-L-D) | Inactive | ||
| Emrah Sonmez | Featherweight | 14-5-0 (W-L-D) | Active | |
| Enrique Barzola | “El Fuerte” | Bantamweight | 17-5-2 (W-L-D) | Inactive |
| Enrique Marin | “Wasabi” | Welterweight | 10-4-0 (W-L-D) | Inactive |
| Enson Inoue | Lightweight | 12-8-0 (W-L-D) | Inactive | |
| Eperaim Ginting | Bantamweight | 6-1-0 (W-L-D) | Active | |
| Eric Martin | Heavyweight | 0-1-0 (W-L-D) | Inactive | |
| Eric McConico | Middleweight | 11-4-1 (W-L-D) | Active | |
| Eric Nolan | “Nightime” | Welterweight | 8-5-0 (W-L-D) | Active |
| Eric Schafer | “Red” | Middleweight | 14-8-2 (W-L-D) | Inactive |
| Eric Shelton | “Showtime” | Flyweight | 12-6-0 (W-L-D) | Inactive |
| Eric Spicely | “Zebrinha” | Middleweight | 12-6-0 (W-L-D) | Inactive |
| Eric Wisely | “Little Lee” | Featherweight | 26-9-1 (W-L-D) | Inactive |
| Erick Gonzalez | “The Ghost Pepper” | Lightweight | 14-8-0 (W-L-D) | Inactive |
| Erick Montano | “Perry” | Welterweight | 7-5-0 (W-L-D) | Inactive |
| Erick Silva | “The Tiger” | Welterweight | 19-9-0 (W-L-D) | Inactive |
| Ericka Almeida | Women's Strawweight | 7-3-0 (W-L-D) | Inactive | |
| Erik Koch | “New Breed” | Welterweight | 16-6-0 (W-L-D) | Inactive |
| Erik Perez | “Goyito” | Bantamweight | 17-6-0 (W-L-D) | Inactive |
| Erik Silva | “The King” | Featherweight | 9-4-0 (W-L-D) | Inactive |
| Erin Blanchfield | “Cold Blooded” | Women's Flyweight | 14-2-0 (W-L-D) | Active |
| Erisson Ferreira | Flyweight | 12-2-0 (W-L-D) | Active | |
| Ernest Chavez | “The Mad Titan” | Lightweight | 10-2-0 (W-L-D) | Inactive |
| Ernesta Kareckaite | “Heavy-Handed” | Women's Flyweight | 6-2-1 (W-L-D) | Active |
| Ernie Verdicia | 0-1-0 (W-L-D) | Inactive | ||
| Eryk Anders | “Ya Boi” | Middleweight | 18-9-0 (1 NC) | Inactive |
| Esteban Ribovics | “El Gringo” | Lightweight | 15-3-0 (W-L-D) | Active |
| Estefani Almeida | Women's Flyweight | 7-3-0 (W-L-D) | Active | |
| Estevan Payan | “El Terrible” | Featherweight | 16-12-0 (W-L-D) | Inactive |
| Ethyn Ewing | “The Professor Finesser” | Bantamweight | 10-2-0 (W-L-D) | Active |
| Eugene Jackson | “The Wolf” | Middleweight | 15-9-1 (W-L-D) | Inactive |
| Eugenio Tadeu | Lightweight | 2-3-0 (W-L-D) | Inactive | |
| Evan Dunham | Lightweight | 18-9-1 (W-L-D) | Inactive | |
| Evan Elder | “The Phenom” | Lightweight | 10-2-0 (W-L-D) | Active |
| Evan Sweesy | “Showtime Swees” | Light Heavyweight | 0-0-0 (W-L-D) | Active |
| Evan Tanner | Middleweight | 32-8-0 (W-L-D) | Inactive | |
| Everett Sims | Heavyweight | 4-1-0 (W-L-D) | Inactive | |
| Ezra Elliot | Featherweight | 8-0-0 (W-L-D) | Active | |
| Ezra Elliott | 8-0-0 (W-L-D) | Inactive | ||
| Fabiano Iha | Lightweight | 9-5-0 (W-L-D) | Inactive | |
| Fabiano Scherner | “Pegaleve” | Heavyweight | 11-10-0 (W-L-D) | Inactive |
| Fabio Agu | Middleweight | 0-0-0 (W-L-D) | Active | |
| Fabio Cherant | “Water Buffalo” | Light Heavyweight | 7-4-0 (W-L-D) | Inactive |
| Fabio Gurgel | 3-2-0 (W-L-D) | Inactive | ||
| Fabio Maldonado | “Caipira de Aco” | Light Heavyweight | 23-11-0 (W-L-D) | Inactive |
| Fabiola Pidroni | Women's Strawweight | 5-0-0 (W-L-D) | Active | |
| Fabricio Camoes | “Morango” | Lightweight | 14-9-1 (W-L-D) | Inactive |
| Fabricio Werdum | “Vai Cavalo” | Heavyweight | 24-9-1 (W-L-D) | Inactive |
| Falaniko Vitale | “Niko” | Middleweight | 30-11-0 (W-L-D) | Inactive |
| Farid Basharat | “Ferocious” | Bantamweight | 16-0-0 (W-L-D) | Active |
| Farman Hasanov | “The Lion” | Welterweight | 6-0-0 (W-L-D) | Active |
| Farès Ziam | “Smile Killer” | Lightweight | 18-5-0 (W-L-D) | Active |
| Fatima Kline | “The Archangel” | Women's Strawweight | 10-1-0 (W-L-D) | Active |
| Felice Herrig | “Lil Bulldog” | Women's Strawweight | 14-10-0 (W-L-D) | Inactive |
| Felicia Spencer | “FeeNom” | Featherweight | 9-3-0 (W-L-D) | Inactive |
| Felipe Arantes | “Sertanejo” | Bantamweight | 18-10-1 (W-L-D) | Inactive |
| Felipe Bunes | “Felipinho” | Flyweight | 14-9-0 (W-L-D) | Inactive |
| Felipe Colares | “Cabocao” | Featherweight | 10-4-0 (W-L-D) | Inactive |
| Felipe Franco | “Negão” | Heavyweight | 10-1-0 (W-L-D) | Active |
| Felipe Lima | “Jungle Boy” | Bantamweight | 14-2-0 (W-L-D) | Active |
| Felipe Olivieri | Lightweight | 14-5-0 (W-L-D) | Inactive | |
| Felipe Silva | Lightweight | 8-2-0 (W-L-D) | Inactive | |
| Felipe dos Santos | “Lipe Detona” | Flyweight | 8-3-0 (W-L-D) | Inactive |
| Felix Klinkhammer | Welterweight | 7-0-0 (W-L-D) | Active | |
| Felix Lee Mitchell | 2-7-0 (W-L-D) | Inactive | ||
| Feng Pengchao | Featherweight | 15-9-1 (W-L-D) | Active | |
| Feng Xiaocan | 11-5-0 (W-L-D) | Inactive | ||
| Fernando Bruno | 15-4-0 (W-L-D) | Inactive | ||
| Fernando Padilla | “El Valiente” | Featherweight | 16-6-0 (W-L-D) | Active |
| Fernie Garcia | Bantamweight | 10-5-0 (W-L-D) | Active | |
| Filip Pejic | “Nitro” | Bantamweight | 12-2-2 (W-L-D) | Inactive |
| Flavio Luiz Moura | 19-7-0 (W-L-D) | Inactive | ||
| Flavio Moura | Middleweight | 0-0-0 (W-L-D) | Inactive | |
| Floyd Sword | Middleweight | 12-3-0 (W-L-D) | Inactive | |
| Forrest Griffin | Light Heavyweight | 19-7-0 (W-L-D) | Inactive | |
| Forrest Petz | “The Meat Cleaver” | Welterweight | 26-10-0 (W-L-D) | Inactive |
| Francesco Maturi | 0-1-0 (W-L-D) | Inactive | ||
| Francimar Barroso | “Bodao” | Light Heavyweight | 19-7-0 (W-L-D) | Inactive |
| Francis Carmont | “Limitless” | Middleweight | 25-12-0 (W-L-D) | Inactive |
| Francis Marshall | “Fire” | Lightweight | 10-3-0 (W-L-D) | Active |
| Francis Ngannou | “The Predator” | Heavyweight | 17-3-0 (W-L-D) | Inactive |
| Francisco Figueiredo | “Sniper” | Flyweight | 13-5-1 (W-L-D) | Inactive |
| Francisco Prado | Welterweight | 12-5-0 (W-L-D) | Active | |
| Francisco Rivera | “Cisco” | Bantamweight | 11-7-0 (W-L-D) | Inactive |
| Francisco Trevino | “Sitkayan” | Lightweight | 13-3-0 (W-L-D) | Inactive |
| Francisco Trinaldo | “Massaranduba” | Welterweight | 28-9-0 (W-L-D) | Inactive |
| Frank Camacho | “The Crank” | Lightweight | 22-10-0 (W-L-D) | Inactive |
| Frank Caracci | Lightweight | 2-3-0 (W-L-D) | Inactive | |
| Frank Hamaker | 1-0-0 (W-L-D) | Inactive | ||
| Frank Holland | “The Tank” | Heavyweight | 0-0-0 (W-L-D) | Active |
| Frank Lester | “The Tank” | Welterweight | 11-6-0 (W-L-D) | Inactive |
| Frank Mir | Heavyweight | 18-11-0 (W-L-D) | Inactive | |
| Frank Shamrock | Middleweight | 23-10-2 (W-L-D) | Inactive | |
| Frank Trigg | “Twinkle Toes” | Welterweight | 21-9-0 (W-L-D) | Inactive |
| Frankie Edgar | “The Answer” | Bantamweight | 23-11-1 (W-L-D) | Inactive |
| Frankie Perez | Lightweight | 10-4-0 (W-L-D) | Inactive | |
| Frankie Saenz | Bantamweight | 13-7-0 (W-L-D) | Active | |
| Fred Ettish | 1-1-0 (W-L-D) | Inactive | ||
| Freddy Emiliano Linares | Featherweight | 0-1-0 (W-L-D) | Active | |
| Fredson Paixao | “Freddy Passion” | Featherweight | 10-5-0 (W-L-D) | Inactive |
| Fredy Serrano | “El Profe” | Flyweight | 3-2-0 (W-L-D) | Inactive |
| Gabe Green | “Gifted” | Lightweight | 12-5-0 (W-L-D) | Active |
| Gabe Ruediger | “Godzilla” | Lightweight | 18-8-0 (W-L-D) | Inactive |
| Gable Steveson | Heavyweight | 4-0-0 (W-L-D) | Active | |
| Gabriel Benitez | “Moggly” | Lightweight | 23-13-0 (W-L-D) | Inactive |
| Gabriel Bonfim | “Marretinha” | Welterweight | 20-1-0 (W-L-D) | Active |
| Gabriel Checco | “Zangief” | Middleweight | 10-2-0 (W-L-D) | Inactive |
| Gabriel Gonzaga | “Napao” | Heavyweight | 17-11-0 (W-L-D) | Inactive |
| Gabriel Miranda | “Fly” | Featherweight | 17-8-0 (W-L-D) | Inactive |
| Gabriel Santos | “Mosquitinho” | Featherweight | 12-2-0 (W-L-D) | Active |
| Gabriel Silva | Bantamweight | 8-2-0 (W-L-D) | Inactive | |
| Gabriella Fernandes | “Gabi” | Women's Flyweight | 11-4-0 (W-L-D) | Active |
| Gadzhi Omargadzhiev | Welterweight | 13-2-0 (W-L-D) | Inactive | |
| Gadzhimurad Antigulov | Light Heavyweight | 20-8-0 (W-L-D) | Inactive | |
| Gaetano Pirrello | “El Tigre” | Bantamweight | 15-7-1 (W-L-D) | Inactive |
| Galore Bofando | Welterweight | 5-3-0 (W-L-D) | Inactive | |
| Gan McGee | “The Giant” | Heavyweight | 13-5-0 (W-L-D) | Inactive |
| Garett Whiteley | “Goodnight” | Lightweight | 7-3-0 (W-L-D) | Inactive |
| Garreth McLellan | “Soldierboy” | Middleweight | 13-6-0 (W-L-D) | Inactive |
| Garrett Armfield | Bantamweight | 10-5-0 (W-L-D) | Active | |
| Garrett Grimes | Middleweight | 0-0-0 (W-L-D) | Active | |
| Garrett Gross | “Glory to God” | Lightweight | 11-7-0 (W-L-D) | Active |
| Gary Goodridge | Heavyweight | 23-22-1 (W-L-D) | Inactive | |
| Gary Mangat | Flyweight | 15-3-0 (W-L-D) | Inactive | |
| Gasan Umalatov | “Cobra” | Welterweight | 17-4-2 (W-L-D) | Inactive |
| Gaston Bolanos | “DreamKiller” | Featherweight | 9-5-0 (W-L-D) | Active |
| Gauge Young | “Gee Money” | Lightweight | 11-3-0 (W-L-D) | Active |
| Gavin Tucker | “Guv'nor” | Featherweight | 13-3-0 (W-L-D) | Inactive |
| Geane Herrera | “The Revolutionary” | Flyweight | 9-3-0 (W-L-D) | Inactive |
| Gegard Mousasi | Middleweight | 42-6-2 (W-L-D) | Inactive | |
| Genaro Valdez | “Rayadito” | Lightweight | 10-3-0 (W-L-D) | Inactive |
| Genki Sudo | “The Neo Samurai” | Lightweight | 15-4-2 (W-L-D) | Inactive |
| Geoff Neal | “Handz of Steel” | Welterweight | 16-8-0 (W-L-D) | Active |
| George Hardwick | Lightweight | 12-2-0 (W-L-D) | Active | |
| George Roop | Bantamweight | 15-13-1 (W-L-D) | Inactive | |
| George Sotiropoulos | Lightweight | 14-7-0 (W-L-D) | Inactive | |
| George Sullivan | “The Silencer” | Welterweight | 17-7-0 (W-L-D) | Inactive |
| Georges St-Pierre | “Rush” | Middleweight | 26-2-0 (W-L-D) | Inactive |
| Gerald Harris | “Hurricane” | Middleweight | 23-5-0 (W-L-D) | Inactive |
| Gerald Meerschaert | “GM3” | Middleweight | 37-22-0 (W-L-D) | Active |
| Gerald Strebendt | Lightweight | 9-7-0 (W-L-D) | Inactive | |
| Geraldo De Freitas | 12-6-0 (W-L-D) | Inactive | ||
| Geraldo de Freitas Jr. | “Spartan” | Bantamweight | 12-6-0 (W-L-D) | Inactive |
| Gerard Gordeau | 2-2-0 (W-L-D) | Inactive | ||
| Germaine de Randamie | “The Iron Lady” | Women's Bantamweight | 10-5-0 (W-L-D) | Inactive |
| Geronimo dos Santos | “Mondragon” | Heavyweight | 39-19-0 (W-L-D) | Inactive |
| Gerry Harris | 1-4-0 (W-L-D) | Inactive | ||
| Geza Kahlman Jr | 0-0-0 (W-L-D) | Inactive | ||
| Geza Kalman | 4-9-0 (W-L-D) | Inactive | ||
| Giacomo Lemos | “The Viking” | Heavyweight | 6-0-0 (W-L-D) | Inactive |
| Gian Siqueira | Welterweight | 19-5-0 (W-L-D) | Inactive | |
| Gian Villante | Heavyweight | 17-14-0 (W-L-D) | Inactive | |
| Gianni Vazquez | “Kriptonita” | Bantamweight | 13-5-1 (W-L-D) | Inactive |
| Gideon Ray | “The Gladiator” | Middleweight | 17-15-1 (W-L-D) | Inactive |
| Giga Chikadze | “Ninja” | Featherweight | 15-6-0 (W-L-D) | Active |
| Gil Castillo | Welterweight | 8-5-0 (W-L-D) | Inactive | |
| Gilbert Aldana | “El Peligroso” | Heavyweight | 6-2-0 (W-L-D) | Inactive |
| Gilbert Burns | “Durinho” | Welterweight | 22-10-0 (W-L-D) | Inactive |
| Gilbert Melendez | “El Niño” | Lightweight | 22-8-0 (W-L-D) | Inactive |
| Gilbert Smith | “Jamal” | Middleweight | 12-6-0 (W-L-D) | Inactive |
| Gilbert Urbina | “The RGV Bad Boy” | Middleweight | 7-5-0 (W-L-D) | Active |
| Gilbert Yvel | “The Hurricane” | Heavyweight | 39-16-1 (W-L-D) | Inactive |
| Gillian Robertson | “The Savage” | Women's Strawweight | 17-8-0 (W-L-D) | Active |
| Gina Carano | “Conviction” | Women's Bantamweight | 7-1-0 (W-L-D) | Inactive |
| Gina Mazany | “Danger” | Women's Flyweight | 7-6-0 (W-L-D) | Inactive |
| Gisele Moreira | “Gi” | Women's Bantamweight | 8-3-0 (W-L-D) | Active |
| Glaico Franca | “Nego” | Lightweight | 14-5-0 (W-L-D) | Inactive |
| Glaico Franca Moreira | 15-5-0 (W-L-D) | Inactive | ||
| Gleidson Cutis | “Poney” | Lightweight | 7-4-0 (W-L-D) | Inactive |
| Gleison Tibau | Lightweight | 33-14-0 (W-L-D) | Inactive | |
| Gloria de Paula | “Glorinha” | Women's Strawweight | 6-5-0 (W-L-D) | Inactive |
| Glover Teixeira | Light Heavyweight | 33-9-0 (W-L-D) | Inactive | |
| Godofredo Pepey | 13-6-0 (W-L-D) | Inactive | ||
| Gokhan Saki | “The Rebel” | Light Heavyweight | 1-2-0 (W-L-D) | Inactive |
| Gokhan Saricam | Heavyweight | 12-2-0 (W-L-D) | Active | |
| Goran Reljic | Middleweight | 15-8-0 (W-L-D) | Inactive | |
| Grant Dawson | “KGD” | Lightweight | 24-3-1 (W-L-D) | Active |
| Gray Maynard | Featherweight | 13-7-1 (1 NC) | Inactive | |
| Greg Hardy | “Prince of War” | Heavyweight | 7-5-0 (W-L-D) | Inactive |
| Greg Rebello | “Ribz” | Heavyweight | 24-8-0 (W-L-D) | Active |
| Greg Soto | Welterweight | 9-4-0 (W-L-D) | Inactive | |
| Greg Stott | Heavyweight | 0-1-0 (W-L-D) | Inactive | |
| Greg Velasco | Heavyweight | 6-1-0 (W-L-D) | Active | |
| Gregor Gillespie | “The Gift” | Lightweight | 14-1-0 (W-L-D) | Active |
| Gregory Rodrigues | “Robocop” | Middleweight | 19-6-0 (W-L-D) | Active |
| Grigory Popov | Bantamweight | 13-3-0 (W-L-D) | Inactive | |
| Guangyou Ning | 5-4-1 (W-L-D) | Inactive | ||
| Gugun Gusman | Bantamweight | 8-4-0 (W-L-D) | Inactive | |
| Guido Cannetti | “Ninja” | Bantamweight | 10-8-0 (W-L-D) | Inactive |
| Guilherme Pat | “Kong” | Heavyweight | 6-1-0 (W-L-D) | Active |
| Guilherme Vasconcelos | “Bomba” | Middleweight | 9-4-0 (W-L-D) | Inactive |
| Gunnar Nelson | “Gunni” | Welterweight | 19-6-1 (W-L-D) | Active |
| Guram Kutateladze | “Georgian Viking” | Lightweight | 13-5-0 (W-L-D) | Inactive |
| Gustavo Gabriel | Flyweight | 13-1-0 (W-L-D) | Inactive | |
| Gustavo Lopez | Bantamweight | 12-6-1 (W-L-D) | Inactive | |
| Guto Inocente | Light Heavyweight | 7-4-0 (W-L-D) | Inactive | |
| Guy Mezger | Middleweight | 30-14-2 (W-L-D) | Inactive | |
| Hacran Dias | Lightweight | 23-6-1 (W-L-D) | Inactive | |
| Hailey Cowan | “All Hail” | Women's Bantamweight | 7-5-0 (W-L-D) | Active |
| Hakeem Dawodu | “Mean” | Featherweight | 13-4-1 (W-L-D) | Inactive |
| Hamdy Abdelwahab | “The Hammer” | Heavyweight | 7-1-0 (W-L-D) | Inactive |
| HanSeul Kim | Welterweight | 13-6-0 (W-L-D) | Inactive | |
| Hannah Cifers | “Shockwave” | Women's Strawweight | 10-7-0 (W-L-D) | Inactive |
| Hannah Goldy | “24K” | Women's Flyweight | 6-4-0 (W-L-D) | Active |
| Hans Stringer | Light Heavyweight | 22-8-3 (W-L-D) | Inactive | |
| Harold Howard | 1-3-0 (W-L-D) | Inactive | ||
| Harrison Garcia | “Hitman” | Light Heavyweight | 0-0-0 (W-L-D) | Active |
| Harry Hardwick | “Houdini” | Featherweight | 13-5-1 (W-L-D) | Active |
| Harry Hunsucker | “The Hurricane” | Light Heavyweight | 7-6-0 (W-L-D) | Inactive |
| Harry Moskowitz | Heavyweight | 6-12-0 (W-L-D) | Inactive | |
| Harvey Park | Lightweight | 12-3-0 (W-L-D) | Inactive | |
| Hashem Arkhagha | Middleweight | 6-1-0 (W-L-D) | Inactive | |
| Hatsu Hioki | Featherweight | 29-10-2 (W-L-D) | Inactive | |
| Hayato Sakurai | “Mach” | Welterweight | 38-13-2 (W-L-D) | Inactive |
| Hayder Hassan | Welterweight | 6-3-0 (W-L-D) | Inactive | |
| He-Man Gipson | 1-2-0 (W-L-D) | Inactive | ||
| Heath Herring | “The Texas Crazy Horse” | Heavyweight | 28-16-0 (W-L-D) | Inactive |
| Heather Clark | 7-6-0 (W-L-D) | Inactive | ||
| Heather Jo Clark | “Hurricane” | Women's Strawweight | 7-6-0 (W-L-D) | Inactive |
| Hecher Sosa | “Guanche Warrior” | Bantamweight | 15-1-0 (W-L-D) | Active |
| Hector Aldana | “El Charro” | Welterweight | 4-3-0 (W-L-D) | Inactive |
| Hector Lombard | “Showeather” | Middleweight | 34-10-1 (W-L-D) | Inactive |
| Hector Ramirez | “Sick Dog” | Light Heavyweight | 10-6-1 (W-L-D) | Inactive |
| Hector Sandoval | “Kid Alex” | Flyweight | 14-4-0 (W-L-D) | Inactive |
| Hector Urbina | “El Toro” | Welterweight | 17-10-1 (W-L-D) | Inactive |
| Henrique Da Silva Lopes | Heavyweight | 5-2-0 (W-L-D) | Active | |
| Henrique Shiguemoto | Middleweight | 13-4-1 (W-L-D) | Active | |
| Henrique da Silva | “Frankenstein” | Light Heavyweight | 14-5-0 (W-L-D) | Active |
| Henry Briones | “Bure” | Bantamweight | 16-8-1 (W-L-D) | Inactive |
| Henry Cejudo | “Triple C” | Bantamweight | 16-6-0 (W-L-D) | Inactive |
| Henry Martinez | “Sicario” | Lightweight | 9-4-0 (W-L-D) | Inactive |
| Herbert Burns | “The Blaze” | Featherweight | 11-6-0 (W-L-D) | Inactive |
| Herdem Alacabek | Light Heavyweight | 5-1-0 (W-L-D) | Active | |
| Hermes Franca | “The Unreal” | Lightweight | 24-17-0 (W-L-D) | Inactive |
| Hernani Perpetuo | Welterweight | 18-5-0 (W-L-D) | Inactive | |
| Hilarie Rose | Women's Strawweight | 4-2-0 (W-L-D) | Inactive | |
| Ho Taek Oh | Lightweight | 7-2-1 (W-L-D) | Inactive | |
| Holly Holm | “The Preacher's Daughter” | Women's Bantamweight | 15-7-0 (W-L-D) | Inactive |
| Homer Moore | “The Rock” | Light Heavyweight | 26-9-2 (W-L-D) | Inactive |
| Horacio Gutierrez | “The Punisher” | Featherweight | 4-3-0 (W-L-D) | Inactive |
| Houston Alexander | “The Assassin” | Light Heavyweight | 17-15-1 (W-L-D) | Inactive |
| Houston Dorr | Heavyweight | 1-2-0 (W-L-D) | Inactive | |
| Hu Yaozong | “Bad Boy” | Middleweight | 3-3-0 (W-L-D) | Inactive |
| Hugo Cunha | Heavyweight | 8-2-0 (W-L-D) | Inactive | |
| Hugo Duarte | Heavyweight | 6-3-0 (W-L-D) | Inactive | |
| Hugo Viana | “Wolverine” | Bantamweight | 8-4-0 (W-L-D) | Inactive |
| Humberto Bandenay | Featherweight | 14-7-0 (W-L-D) | Inactive | |
| Humberto Brown | “El Gato Negro” | Featherweight | 4-5-0 (W-L-D) | Inactive |
| Humberto Brown Morrison | 4-6-0 (W-L-D) | Inactive | ||
| Hunter Azure | Bantamweight | 9-2-0 (W-L-D) | Inactive | |
| Hyder Amil | “The Hurricane” | Featherweight | 11-3-0 (W-L-D) | Active |
| Hyun Gyu Lim | “The Ace” | Welterweight | 13-7-1 (W-L-D) | Inactive |
| HyunSung Park | “Peace of Mind” | Flyweight | 10-2-0 (W-L-D) | Active |
| Ian Entwistle | “Enty” | Bantamweight | 9-3-0 (W-L-D) | Inactive |
| Ian Freeman | “The Machine” | Heavyweight | 20-7-1 (W-L-D) | Inactive |
| Ian Heinisch | “The Hurricane” | Middleweight | 14-5-0 (W-L-D) | Active |
| Ian Loveland | “The Barn Owl” | Bantamweight | 18-10-0 (W-L-D) | Inactive |
| Ian Machado Garry | “The Future” | Welterweight | 17-1-0 (W-L-D) | Active |
| Ian McCall | “Uncle Creepy” | Flyweight | 13-5-1 (W-L-D) | Inactive |
| Iasmin Lucindo | Women's Strawweight | 18-6-0 (W-L-D) | Active | |
| Ibo Aslan | “The Last Ottoman” | Light Heavyweight | 14-4-0 (W-L-D) | Active |
| Icho Larenas | Heavyweight | 6-5-0 (W-L-D) | Inactive | |
| Ignacio Bahamondes | “La Jaula” | Lightweight | 17-7-0 (W-L-D) | Active |
| Igor Araujo | Welterweight | 25-9-0 (W-L-D) | Inactive | |
| Igor Pokrajac | “The Duke” | Light Heavyweight | 28-13-0 (W-L-D) | Inactive |
| Igor Severino | Flyweight | 8-1-0 (W-L-D) | Active | |
| Igor Zinoviev | Middleweight | 4-1-2 (W-L-D) | Inactive | |
| Ihor Potieria | “The Duelist” | Middleweight | 20-8-0 (W-L-D) | Inactive |
| Ike Villanueva | 18-14-0 (W-L-D) | Inactive | ||
| Ike Villanueva | “Hurricane” | Light Heavyweight | 18-14-0 (W-L-D) | Inactive |
| Ikram Aliskerov | Middleweight | 18-2-0 (W-L-D) | Active | |
| Ikuhisa Minowa | Middleweight | 60-42-8 (W-L-D) | Inactive | |
| Ildemar Alcantara | “Marajo” | Middleweight | 21-11-0 (W-L-D) | Inactive |
| Ilia Topuria | “El Matador” | Lightweight | 17-1-0 (W-L-D) | Active |
| Iliarde Santos | Flyweight | 30-13-1 (W-L-D) | Inactive | |
| Ilir Latifi | “The Sledgehammer” | Heavyweight | 17-9-0 (W-L-D) | Inactive |
| Imanol Rodriguez | “Himan” | Flyweight | 7-0-0 (W-L-D) | Active |
| Impa Kasanganay | “Tshilobo” | Welterweight | 9-2-0 (W-L-D) | Inactive |
| Ion Cutelaba | “The Hulk” | Light Heavyweight | 20-12-1 (W-L-D) | Active |
| Irene Aldana | Women's Bantamweight | 15-8-0 (W-L-D) | Inactive | |
| Irina Alekseeva | “Russian Ronda” | Women's Bantamweight | 5-4-0 (W-L-D) | Inactive |
| Irwin Rivera | “The Beast” | Bantamweight | 10-6-0 (W-L-D) | Inactive |
| Isaac Dulgarian | “The Midwest Choppa” | Featherweight | 7-2-0 (W-L-D) | Inactive |
| Isaac Thomson | Featherweight | 9-3-0 (W-L-D) | Inactive | |
| Isaac Vallie-Flagg | Lightweight | 16-7-1 (W-L-D) | Inactive | |
| Isabela De Padua | “Belinha” | Women's Flyweight | 5-2-0 (W-L-D) | Inactive |
| Isi Fitikefu | Light Heavyweight | 6-0-0 (W-L-D) | Inactive | |
| Isis Verbeek | Women's Strawweight | 5-2-0 (W-L-D) | Active | |
| Islam Dulatov | “The Ripper” | Welterweight | 12-1-0 (W-L-D) | Active |
| C Islam Makhachev | Welterweight | 28-1-0 (W-L-D) | Active | |
| Ismael Bonfim | “Marreta” | Lightweight | 20-6-0 (W-L-D) | Active |
| Ismail Naurdiev | “Berzdog” | Middleweight | 25-8-0 (W-L-D) | Active |
| Israel Adesanya | “The Last Stylebender” | Middleweight | 24-6-0 (W-L-D) | Active |
| Issa Isakov | Lightweight | 10-3-0 (W-L-D) | Active | |
| Issei Tamura | Bantamweight | 10-8-0 (W-L-D) | Inactive | |
| Istela Nunes | Women's Strawweight | 6-6-0 (W-L-D) | Inactive | |
| Iuri Alcantara | “Marajo” | Bantamweight | 35-10-0 (W-L-D) | Inactive |
| Ivan Erslan | Light Heavyweight | 15-6-0 (W-L-D) | Inactive | |
| Ivan Jorge | Lightweight | 27-7-0 (W-L-D) | Inactive | |
| Ivan Menjivar | “The Pride of El Salvador” | Featherweight | 25-12-0 (W-L-D) | Inactive |
| Ivan Salaverry | Middleweight | 14-9-0 (W-L-D) | Inactive | |
| Ivan Serati | “Il Terribile” | Light Heavyweight | 12-4-0 (W-L-D) | Inactive |
| Ivan Shtyrkov | “Ural Hulk” | Light Heavyweight | 15-0-1 (W-L-D) | Inactive |
| Ivan Valenzuela | Middleweight | 8-2-0 (W-L-D) | Active | |
| Ivana Petrovic | Women's Flyweight | 7-3-0 (W-L-D) | Inactive | |
| Iwo Baraniewski | “Rudy” | Light Heavyweight | 9-0-0 (W-L-D) | Active |
| Izabela Badurek | Women's Strawweight | 6-3-0 (W-L-D) | Inactive | |
| J.C. Cottrell | “Superstar” | Lightweight | 17-5-0 (W-L-D) | Inactive |
| JJ Aldrich | Women's Flyweight | 15-7-0 (W-L-D) | Active | |
| JJ Okanovich | “The Bosnian Bomber” | Lightweight | 7-1-0 (W-L-D) | Active |
| JP Buys | “Young Savage” | Bantamweight | 9-6-0 (W-L-D) | Active |
| JR Coughran | Featherweight | 4-1-0 (W-L-D) | Inactive | |
| Jack Cartwright | Bantamweight | 10-1-0 (W-L-D) | Active | |
| Jack Della Maddalena | Welterweight | 18-4-0 (W-L-D) | Active | |
| Jack Hermansson | “The Joker” | Welterweight | 24-10-0 (W-L-D) | Active |
| Jack Jenkins | “Phar” | Featherweight | 14-4-0 (W-L-D) | Active |
| Jack Marshman | “The Hammer” | Middleweight | 23-10-0 (W-L-D) | Inactive |
| Jack May | “The Outlaw” | Heavyweight | 9-3-0 (W-L-D) | Inactive |
| Jack McGlaughlin | 1-4-0 (W-L-D) | Inactive | ||
| Jack Nilson | 2-6-0 (W-L-D) | Inactive | ||
| Jack Nilsson | Lightweight | 0-0-0 (W-L-D) | Inactive | |
| Jack Shore | “Tank” | Featherweight | 17-3-0 (W-L-D) | Inactive |
| Jackie Lee | Lightweight | 0-1-0 (W-L-D) | Inactive | |
| Jackson McVey | “The Moose” | Middleweight | 7-2-0 (W-L-D) | Active |
| Jacob Kilburn | “The Killer” | Featherweight | 8-4-0 (W-L-D) | Inactive |
| Jacob Malkoun | “Mamba” | Middleweight | 10-3-0 (W-L-D) | Active |
| Jacob Rosales | “Lil' Badger” | Lightweight | 13-7-0 (W-L-D) | Inactive |
| Jacob Silva | Flyweight | 6-4-0 (W-L-D) | Active | |
| Jacob Volkmann | “Christmas” | Lightweight | 19-7-0 (W-L-D) | Inactive |
| Jacobe Smith | “Cobe” | Welterweight | 12-0-0 (W-L-D) | Active |
| Jacqueline Cavalcanti | Women's Bantamweight | 10-2-0 (W-L-D) | Active | |
| Jae Hyun Park | Lightweight | 1-2-0 (W-L-D) | Active | |
| Jafel Filho | “Pastor” | Bantamweight | 17-5-0 (W-L-D) | Active |
| Jai Herbert | “Black Country Banger” | Lightweight | 14-6-1 (W-L-D) | Active |
| Jailton Almeida | “Malhadinho” | Heavyweight | 22-5-0 (W-L-D) | Inactive |
| Jaime Alvarez | Flyweight | 6-1-0 (W-L-D) | Active | |
| Jaimee Nievera | “Queenie” | Women's Flyweight | 7-4-0 (W-L-D) | Inactive |
| Jair Farias | Featherweight | 10-1-0 (W-L-D) | Active | |
| Jairzinho Rozenstruik | “Bigi Boy” | Heavyweight | 15-6-0 (W-L-D) | Inactive |
| Jake Collier | “The Prototype” | Heavyweight | 13-10-0 (W-L-D) | Active |
| Jake Ellenberger | “The Juggernaut” | Welterweight | 31-15-0 (W-L-D) | Inactive |
| Jake Hadley | “White Kong” | Bantamweight | 11-4-0 (W-L-D) | Inactive |
| Jake Hecht | “The Hitman” | Welterweight | 11-4-0 (W-L-D) | Inactive |
| Jake Lindsey | “The Librarian” | Lightweight | 12-7-0 (W-L-D) | Inactive |
| Jake Matthews | “The Celtic Kid” | Welterweight | 23-8-0 (W-L-D) | Inactive |
| Jake O'Brien | “Irish” | Light Heavyweight | 15-4-0 (W-L-D) | Inactive |
| Jake Rosholt | Middleweight | 12-5-0 (W-L-D) | Inactive | |
| Jake Shields | Welterweight | 31-9-1 (W-L-D) | Inactive | |
| Jakub Wiklacz | Bantamweight | 18-3-2 (W-L-D) | Active | |
| Jalin Turner | “The Tarantula” | Lightweight | 15-9-0 (W-L-D) | Active |
| Jamahal Hill | “Sweet Dreams” | Light Heavyweight | 12-4-0 (W-L-D) | Active |
| Jamal Pogues | Heavyweight | 11-5-0 (W-L-D) | Inactive | |
| Jamall Emmers | “Pretty Boy” | Featherweight | 22-8-0 (W-L-D) | Active |
| Jamelle Jones | “The Beast” | Light Heavyweight | 7-5-0 (W-L-D) | Active |
| James Barnes | “Mooka” | Bantamweight | 14-5-0 (W-L-D) | Active |
| James Bochnovic | Middleweight | 8-3-0 (W-L-D) | Inactive | |
| James Giboo | Welterweight | 13-5-0 (W-L-D) | Inactive | |
| James Gray | “The Phenom” | Bantamweight | 4-1-0 (W-L-D) | Active |
| James Hammortree | “The Sledge” | Middleweight | 6-3-0 (W-L-D) | Inactive |
| James Head | Welterweight | 9-4-0 (W-L-D) | Inactive | |
| James Irvin | “The Sandman” | Light Heavyweight | 17-10-0 (W-L-D) | Inactive |
| James Krause | “The James Krause” | Welterweight | 28-9-0 (W-L-D) | Active |
| James Lee | Light Heavyweight | 15-3-0 (W-L-D) | Inactive | |
| James Llontop | “Goku” | Lightweight | 14-5-0 (W-L-D) | Inactive |
| James McSweeney | “The Hammer” | Light Heavyweight | 15-15-0 (W-L-D) | Inactive |
| James Moontasri | “Moon Walker” | Welterweight | 9-5-0 (W-L-D) | Inactive |
| James Mulheron | “Juggernaut” | Heavyweight | 11-2-0 (W-L-D) | Inactive |
| James Te Huna | Middleweight | 16-9-0 (W-L-D) | Inactive | |
| James Terry | “Intensity” | Lightweight | 19-9-0 (W-L-D) | Inactive |
| James Toney | “Lights Out” | Heavyweight | 0-1-0 (W-L-D) | Inactive |
| James Vick | “The Texecutioner” | Welterweight | 13-5-0 (W-L-D) | Inactive |
| James Wallace | “Jesse” | Lightweight | 5-2-0 (W-L-D) | Inactive |
| James Wilks | “Lightning” | Welterweight | 7-4-0 (W-L-D) | Inactive |
| James Zikic | “The Messiah” | Light Heavyweight | 21-10-2 (W-L-D) | Inactive |
| Jamey Simmons | “The Afro Samurai” | Bantamweight | 7-4-0 (W-L-D) | Inactive |
| Jamey-Lyn Horth | Women's Flyweight | 9-3-0 (W-L-D) | Active | |
| Jamie Colleen | Women's Strawweight | 4-1-0 (W-L-D) | Inactive | |
| Jamie Moyle | Women's Strawweight | 4-3-0 (W-L-D) | Inactive | |
| Jamie Mullarkey | “Hooligan” | Lightweight | 18-9-0 (W-L-D) | Inactive |
| Jamie Pickett | “The Night Wolf” | Middleweight | 13-11-0 (W-L-D) | Inactive |
| Jamie Siraj | “The Gremlin” | Bantamweight | 14-4-0 (W-L-D) | Active |
| Jamie Varner | Lightweight | 21-11-1 (W-L-D) | Inactive | |
| Jamie Yager | “chosyn-1” | Middleweight | 8-4-0 (W-L-D) | Inactive |
| Jan Błachowicz | Light Heavyweight | 29-11-2 (W-L-D) | Active | |
| Janaina Silva | Women's Strawweight | 5-1-0 (W-L-D) | Active | |
| Janay Harding | Women's Bantamweight | 2-3-0 (W-L-D) | Inactive | |
| Jansey Silva | Middleweight | 7-2-0 (W-L-D) | Active | |
| Jaqueline Amorim | Women's Strawweight | 11-2-0 (W-L-D) | Active | |
| Jared Cannonier | “Tha Killa Gorilla” | Middleweight | 18-10-0 (W-L-D) | Active |
| Jared Gooden | “Nite Train” | Welterweight | 23-10-0 (W-L-D) | Inactive |
| Jared Gordon | “Flash” | Lightweight | 21-9-0 (1 NC) | Active |
| Jared Hamman | “The Messenger” | Middleweight | 14-6-0 (W-L-D) | Inactive |
| Jared Papazian | “The Jackhammer” | Flyweight | 20-13-0 (W-L-D) | Inactive |
| Jared Rollins | “J-ROC” | Welterweight | 8-4-0 (W-L-D) | Inactive |
| Jared Rosholt | Heavyweight | 14-4-0 (W-L-D) | Inactive | |
| Jared Vanderaa | Heavyweight | 12-10-0 (W-L-D) | Inactive | |
| Jarjis Danho | “Man Mountain” | Heavyweight | 7-1-1 (W-L-D) | Inactive |
| Jarno Errens | Featherweight | 14-6-1 (W-L-D) | Inactive | |
| Jarred Brooks | “The Monkey God” | Flyweight | 13-2-0 (W-L-D) | Inactive |
| Jasmine Jasudavicius | Women's Flyweight | 15-4-0 (W-L-D) | Active | |
| Jason Black | Lightweight | 23-4-1 (W-L-D) | Inactive | |
| Jason Brilz | “Hitman” | Light Heavyweight | 22-6-1 (W-L-D) | Inactive |
| Jason Day | “Dooms” | Middleweight | 19-12-0 (W-L-D) | Inactive |
| Jason DeLucia | Middleweight | 33-21-1 (W-L-D) | Inactive | |
| Jason Dent | “Dynamite” | Lightweight | 22-13-0 (W-L-D) | Inactive |
| Jason Fairn | 4-5-0 (W-L-D) | Inactive | ||
| Jason Gilliam | “The Gizzard” | Welterweight | 14-9-0 (W-L-D) | Inactive |
| Jason Godsey | 16-16-0 (W-L-D) | Inactive | ||
| Jason Gonzalez | “Nicoya” | Lightweight | 11-5-0 (W-L-D) | Inactive |
| Jason High | “The Kansas City Bandit” | Lightweight | 21-6-0 (W-L-D) | Inactive |
| Jason Jackson | “Jah-Son” | Welterweight | 7-2-0 (W-L-D) | Inactive |
| Jason Knight | “The Kid” | Featherweight | 20-5-0 (W-L-D) | Inactive |
| Jason Lambert | “The Punisher” | Middleweight | 26-13-0 (W-L-D) | Inactive |
| Jason MacDonald | “The Athlete” | Middleweight | 25-16-0 (W-L-D) | Inactive |
| Jason Miller | “Mayhem” | Welterweight | 23-10-0 (W-L-D) | Inactive |
| Jason Novelli | “Pepsi” | Lightweight | 11-3-1 (W-L-D) | Inactive |
| Jason Reinhardt | Bantamweight | 20-3-0 (W-L-D) | Inactive | |
| Jason Saggo | Lightweight | 12-4-0 (W-L-D) | Inactive | |
| Jason Tan | Welterweight | 5-3-0 (W-L-D) | Inactive | |
| Jason Thacker | Middleweight | 0-1-0 (W-L-D) | Inactive | |
| Jason Von Flue | “Live Wire” | Welterweight | 14-12-1 (W-L-D) | Inactive |
| Jason Witt | “The Vanilla Gorilla” | Welterweight | 19-9-0 (W-L-D) | Inactive |
| Jason Young | “Shotgun” | Featherweight | 9-6-0 (W-L-D) | Inactive |
| Javid Basharat | “The Snow Leopard” | Bantamweight | 15-2-0 (1 NC) | Inactive |
| Javier Reyes | “Blair” | Featherweight | 23-6-0 (W-L-D) | Active |
| Javier Vazquez | “Showtime” | Featherweight | 16-5-0 (W-L-D) | Inactive |
| Jay Cucciniello | “MellowFellow” | Featherweight | 8-1-0 (W-L-D) | Inactive |
| Jay Hieron | “The Thoroughbred” | Welterweight | 23-7-0 (W-L-D) | Inactive |
| Jay Perrin | “The Joker” | Bantamweight | 10-7-0 (W-L-D) | Inactive |
| Jay Silva | Middleweight | 10-11-1 (W-L-D) | Inactive | |
| Jean Matsumoto | Bantamweight | 18-2-0 (W-L-D) | Active | |
| Jean Silva | “Lord” | Featherweight | 17-3-0 (W-L-D) | Active |
| Jean-Paul Lebosnoyani | “Mufasa” | Welterweight | 10-2-0 (W-L-D) | Active |
| Jeff Cox | “The Grinder” | Lightweight | 10-7-0 (W-L-D) | Inactive |
| Jeff Curran | “Big Frog” | Bantamweight | 36-18-1 (W-L-D) | Inactive |
| Jeff Hougland | “Hellbound” | Bantamweight | 10-6-0 (W-L-D) | Inactive |
| Jeff Hughes | “Lights Out” | Heavyweight | 10-4-0 (1 NC) | Inactive |
| Jeff Joslin | “The Inferno” | Welterweight | 5-3-0 (W-L-D) | Inactive |
| Jeff Molina | 11-2-0 (W-L-D) | Inactive | ||
| Jeff Monson | “The Snowman” | Heavyweight | 60-26-1 (W-L-D) | Inactive |
| Jeff Newton | “The Karate Kid” | Light Heavyweight | 4-2-0 (W-L-D) | Inactive |
| Jefferson Nascimento | “Toddynho” | Welterweight | 13-1-0 (W-L-D) | Active |
| Jeffrey Molina | “El Jefe” | Flyweight | 11-2-0 (W-L-D) | Inactive |
| Jeisla Chaves | “A Braba” | Women's Strawweight | 8-0-0 (W-L-D) | Active |
| Jeka Saragih | Featherweight | 14-5-0 (W-L-D) | Inactive | |
| Jenel Lausa | “The Demolition Man” | Flyweight | 7-5-0 (W-L-D) | Inactive |
| Jennifer Gonzalez | “La Jefa” | Women's Flyweight | 13-5-0 (W-L-D) | Inactive |
| Jennifer Maia | Women's Flyweight | 21-10-1 (W-L-D) | Active | |
| Jens Pulver | “Lil' Evil” | Lightweight | 27-19-1 (W-L-D) | Inactive |
| JeongYeong Lee | “Korean Tiger” | Featherweight | 11-3-0 (W-L-D) | Active |
| Jeremia Siregar | Flyweight | 6-3-0 (W-L-D) | Inactive | |
| Jeremiah Wells | Welterweight | 13-4-1 (W-L-D) | Active | |
| Jeremy Horn | Middleweight | 91-22-5 (W-L-D) | Inactive | |
| Jeremy Jackson | Welterweight | 9-5-0 (W-L-D) | Inactive | |
| Jeremy Kennedy | “JBC” | Featherweight | 11-1-0 (W-L-D) | Inactive |
| Jeremy Kimball | “Grizzly” | Light Heavyweight | 15-8-0 (W-L-D) | Inactive |
| Jeremy Larsen | Featherweight | 8-5-0 (W-L-D) | Inactive | |
| Jeremy Stephens | “Lil' Heathen” | Lightweight | 29-23-0 (1 NC) | Active |
| Jermaine Andre | Middleweight | 14-4-0 (W-L-D) | Inactive | |
| Jerome Rivera | “Renegade” | Flyweight | 10-6-0 (W-L-D) | Inactive |
| Jerrod Sanders | “J-Reazie” | Bantamweight | 16-3-0 (W-L-D) | Inactive |
| Jerry Bohlander | Middleweight | 11-4-0 (W-L-D) | Inactive | |
| Jess Liaudin | “The Joker” | Lightweight | 20-11-0 (W-L-D) | Inactive |
| Jessamyn Duke | “The Gun” | Women's Bantamweight | 3-5-0 (W-L-D) | Inactive |
| Jesse Bongfeldt | “Water” | Middleweight | 16-5-1 (W-L-D) | Inactive |
| Jesse Butler | Bantamweight | 12-6-0 (W-L-D) | Inactive | |
| Jesse Forbes | Middleweight | 15-5-0 (W-L-D) | Inactive | |
| Jesse Lennox | “The Ox” | Welterweight | 14-4-0 (W-L-D) | Inactive |
| Jesse Mariotti | “Slap Papi” | Light Heavyweight | 0-0-0 (W-L-D) | Active |
| Jesse Murray | “Hollywood” | Light Heavyweight | 8-4-0 (W-L-D) | Active |
| Jesse Ronson | “The Body Snatcher” | Lightweight | 21-12-0 (W-L-D) | Inactive |
| Jesse Sanders | “Iron Jaw” | Welterweight | 23-7-0 (W-L-D) | Inactive |
| Jesse Strader | “Sui Generis” | Bantamweight | 5-3-0 (W-L-D) | Inactive |
| Jesse Taylor | “JT Money” | Middleweight | 31-15-0 (W-L-D) | Inactive |
| Jessica Aguilar | “Jag” | Women's Strawweight | 20-8-0 (W-L-D) | Inactive |
| Jessica Eye | “Evil” | Women's Flyweight | 15-11-0 (W-L-D) | Inactive |
| Jessica Penne | Women's Strawweight | 14-9-0 (W-L-D) | Inactive | |
| Jessica Rakoczy | “Ragin” | Women's Strawweight | 1-5-0 (W-L-D) | Inactive |
| Jessica-Rose Clark | Women's Bantamweight | 11-9-0 (W-L-D) | Inactive | |
| Jessin Ayari | Lightweight | 16-6-0 (W-L-D) | Inactive | |
| Jesus Aguilar | Flyweight | 12-4-0 (W-L-D) | Inactive | |
| Jesus Pinedo | “El Mudo” | Lightweight | 16-5-1 (W-L-D) | Inactive |
| Jhonata Diniz | Heavyweight | 9-2-0 (W-L-D) | Active | |
| Jhonata Silva | Flyweight | 8-2-0 (W-L-D) | Active | |
| Jhonoven Pati | Middleweight | 6-4-0 (W-L-D) | Active | |
| Ji Yeon Kim | “Firefist” | Women's Flyweight | 9-7-2 (W-L-D) | Inactive |
| Jianping Yang | “Tiger” | Featherweight | 11-4-1 (W-L-D) | Inactive |
| Jim Alers | “The Beast” | Featherweight | 13-3-0 (1 NC) | Inactive |
| Jim Miller | “A-10” | Lightweight | 39-19-0 (W-L-D) | Active |
| Jim Mullen | Heavyweight | 0-2-0 (W-L-D) | Inactive | |
| Jim Wallhead | 29-11-0 (W-L-D) | Inactive | ||
| Jimi Manuwa | “Poster Boy” | Light Heavyweight | 17-6-0 (W-L-D) | Inactive |
| Jimmie Rivera | “El Terror” | Bantamweight | 23-5-0 (W-L-D) | Inactive |
| Jimmy Crute | Light Heavyweight | 14-4-2 (W-L-D) | Active | |
| Jimmy Flick | “The Brick” | Flyweight | 17-9-0 (W-L-D) | Inactive |
| Jimmy Lawson | Heavyweight | 4-2-0 (W-L-D) | Inactive | |
| Jimmy Quinlan | “Crash” | Middleweight | 3-1-1 (W-L-D) | Inactive |
| Jimmy Wallhead | “Judo” | Welterweight | 29-11-0 (W-L-D) | Inactive |
| Jimy Hettes | “The Kid” | Featherweight | 11-3-0 (W-L-D) | Inactive |
| Jin Soo Son | Lightweight | 9-4-0 (W-L-D) | Inactive | |
| Jinh Yu Frey | Women's Strawweight | 11-10-0 (W-L-D) | Inactive | |
| Jinnosuke Kashimura | Lightweight | 4-2-0 (W-L-D) | Inactive | |
| Jiri Prochazka | Light Heavyweight | 32-6-1 (W-L-D) | Active | |
| Joachim Christensen | Light Heavyweight | 14-6-0 (W-L-D) | Inactive | |
| Joanderson Brito | “Tubarao” | Featherweight | 19-5-1 (W-L-D) | Active |
| Joanna Jędrzejczyk | Women's Strawweight | 16-5-0 (W-L-D) | Inactive | |
| Joanne Wood | “JoJo” | Women's Flyweight | 17-8-0 (W-L-D) | Active |
| Joao Elias | Flyweight | 17-4-1 (W-L-D) | Active | |
| Joao Pierini | “The Tazmanian Devil” | Welterweight | 4-1-0 (W-L-D) | Inactive |
| Joao Roque | Lightweight | 7-2-4 (W-L-D) | Inactive | |
| Joao Zaiden | Light Heavyweight | 10-3-0 (W-L-D) | Inactive | |
| Joao Zeferino | “The Brazilian Samurai” | Welterweight | 21-9-0 (W-L-D) | Inactive |
| Joaquim Silva | “Netto BJJ” | Lightweight | 14-6-0 (W-L-D) | Active |
| Joaquin Buckley | “New Mansa” | Welterweight | 21-8-0 (W-L-D) | Active |
| Joby Sanchez | Bantamweight | 11-4-0 (W-L-D) | Inactive | |
| Jocelyn Jones-Lybarger | Women's Strawweight | 6-4-0 (W-L-D) | Inactive | |
| Jodie Esquibel | Women's Strawweight | 6-6-0 (W-L-D) | Inactive | |
| Joe Brammer | “The South Side Strangler” | Lightweight | 7-3-1 (W-L-D) | Inactive |
| Joe Charles | Heavyweight | 6-13-0 (W-L-D) | Inactive | |
| Joe Doerksen | “El Dirte” | Middleweight | 51-16-0 (W-L-D) | Inactive |
| Joe Duffy | “Irish” | Lightweight | 16-5-0 (W-L-D) | Inactive |
| Joe Ellenberger | “Excalibur” | Lightweight | 15-2-0 (W-L-D) | Inactive |
| Joe Giannetti | “Skeletor” | Lightweight | 6-1-0 (W-L-D) | Inactive |
| Joe Gigliotti | “Capo” | Middleweight | 7-2-0 (W-L-D) | Inactive |
| Joe Jordan | Lightweight | 49-14-2 (W-L-D) | Inactive | |
| Joe Lauzon | Lightweight | 28-16-0 (W-L-D) | Active | |
| Joe Merritt | “Joey Slash” | Welterweight | 7-2-0 (W-L-D) | Inactive |
| Joe Moreira | 2-2-0 (W-L-D) | Inactive | ||
| Joe Moriera | Lightweight | 0-0-0 (W-L-D) | Inactive | |
| Joe Pardo | Heavyweight | 4-6-0 (W-L-D) | Inactive | |
| Joe Proctor | Welterweight | 11-5-0 (W-L-D) | Inactive | |
| Joe Pyfer | “Bodybagz” | Middleweight | 16-3-0 (W-L-D) | Active |
| Joe Riggs | “Diesel” | Middleweight | 44-17-0 (W-L-D) | Inactive |
| Joe Slick | Middleweight | 16-5-3 (W-L-D) | Inactive | |
| Joe Solecki | Lightweight | 13-6-0 (W-L-D) | Inactive | |
| Joe Son | 0-4-0 (W-L-D) | Inactive | ||
| Joe Soto | Bantamweight | 18-7-0 (W-L-D) | Inactive | |
| Joe Stevenson | “Daddy” | Featherweight | 33-16-0 (W-L-D) | Inactive |
| Joe Vedepo | “The Doctor” | Middleweight | 18-9-0 (W-L-D) | Inactive |
| Joe Veres | “Mighty” | Lightweight | 4-3-0 (W-L-D) | Inactive |
| Joel Alvarez | “El Fenomeno” | Welterweight | 23-4-0 (W-L-D) | Active |
| Joel Sutton | 2-4-1 (W-L-D) | Inactive | ||
| Joey Beltran | “The Mexicutioner” | Light Heavyweight | 17-14-0 (W-L-D) | Inactive |
| Joey Gambino | “The Raging Warrior” | Featherweight | 9-2-0 (W-L-D) | Inactive |
| Joey Gilbert | Lightweight | 2-3-0 (W-L-D) | Inactive | |
| Joey Gomez | “KO King” | Bantamweight | 7-1-0 (W-L-D) | Inactive |
| Joey Roberts | Heavyweight | 4-3-0 (W-L-D) | Inactive | |
| John Adajar | Welterweight | 6-2-0 (W-L-D) | Inactive | |
| John Albert | “Prince” | Bantamweight | 6-5-0 (W-L-D) | Inactive |
| John Alessio | “The Natural” | Lightweight | 35-17-0 (W-L-D) | Inactive |
| John Allan | Light Heavyweight | 13-7-0 (W-L-D) | Inactive | |
| John Campetella | 0-1-0 (W-L-D) | Inactive | ||
| John Castaneda | “Sexi Mexi” | Featherweight | 21-8-1 (W-L-D) | Active |
| John Cholish | Lightweight | 8-3-0 (W-L-D) | Inactive | |
| John Cofer | Lightweight | 8-4-0 (W-L-D) | Inactive | |
| John Dodson | “The Magician” | Bantamweight | 22-12-0 (W-L-D) | Inactive |
| John Dowdy | 0-1-0 (W-L-D) | Inactive | ||
| John Garza | “Mowgli” | Bantamweight | 6-2-0 (W-L-D) | Active |
| John Gunderson | “Guns” | Lightweight | 35-16-2 (W-L-D) | Inactive |
| John Gunther | “The Machine” | Lightweight | 5-1-0 (W-L-D) | Inactive |
| John Halverson | “The Hurricane” | Lightweight | 16-8-0 (W-L-D) | Inactive |
| John Hathaway | “The Hitman” | Welterweight | 17-2-0 (W-L-D) | Inactive |
| John Howard | “Doomsday” | Welterweight | 24-13-0 (W-L-D) | Inactive |
| John Kolosci | Welterweight | 15-9-0 (W-L-D) | Inactive | |
| John Lewis | Lightweight | 3-4-3 (W-L-D) | Inactive | |
| John Lineker | “Hands of Stone” | Bantamweight | 31-9-0 (W-L-D) | Inactive |
| John Lober | Middleweight | 5-9-4 (W-L-D) | Inactive | |
| John Maguire | “The One” | Lightweight | 24-9-0 (W-L-D) | Inactive |
| John Makdessi | “The Bull” | Lightweight | 18-9-0 (W-L-D) | Active |
| John Marsh | “The Bull” | Heavyweight | 8-7-0 (W-L-D) | Inactive |
| John Matua | 1-4-0 (W-L-D) | Inactive | ||
| John Moraga | “Chicano” | Flyweight | 19-7-0 (W-L-D) | Inactive |
| John Phillips | “The Welsh Wrecking Machine” | Middleweight | 22-11-0 (W-L-D) | Inactive |
| John Polakowski | “Buckets of Blood” | Lightweight | 2-2-0 (W-L-D) | Inactive |
| John Salter | Middleweight | 14-3-0 (W-L-D) | Inactive | |
| John Teixeira | “Macapa” | Featherweight | 21-2-2 (W-L-D) | Inactive |
| John Yannis | Bantamweight | 10-5-0 (W-L-D) | Active | |
| John-Olav Einemo | “The Viking” | Heavyweight | 6-3-0 (W-L-D) | Inactive |
| Johnny Bedford | “Brutal” | Bantamweight | 21-13-1 (1 NC) | Inactive |
| Johnny Case | “Hollywood” | Lightweight | 22-6-0 (W-L-D) | Inactive |
| Johnny Eduardo | Bantamweight | 28-13-0 (W-L-D) | Inactive | |
| Johnny Munoz | “Kid Kvenbo” | Bantamweight | 12-4-0 (W-L-D) | Active |
| Johnny Rees | “The Hater Hurter” | Welterweight | 13-5-0 (W-L-D) | Inactive |
| Johnny Rhodes | 2-1-0 (W-L-D) | Inactive | ||
| Johnny Walker | Light Heavyweight | 22-10-0 (1 NC) | Active | |
| Johny Hendricks | “Bigg Rigg” | Middleweight | 18-8-0 (W-L-D) | Inactive |
| Joilton Lutterbach | “Peregrino” | Middleweight | 38-9-0 (W-L-D) | Inactive |
| Jon Delos Reyes | “The Heat” | Flyweight | 8-5-0 (W-L-D) | Inactive |
| Jon Fitch | Welterweight | 30-7-1 (W-L-D) | Inactive | |
| Jon Hess | 1-1-0 (W-L-D) | Inactive | ||
| Jon Jones | “Bones” | Heavyweight | 28-1-0 (W-L-D) | Active |
| Jon Koppenhaver | Welterweight | 6-2-0 (W-L-D) | Inactive | |
| Jon Madsen | Heavyweight | 8-2-0 (W-L-D) | Inactive | |
| Jon Manley | Welterweight | 9-4-0 (W-L-D) | Inactive | |
| Jon Olav Einemo | 6-3-0 (W-L-D) | Inactive | ||
| Jon Tuck | “The Super Saiyan” | Lightweight | 10-5-0 (W-L-D) | Inactive |
| Jonas Bilharinho | Featherweight | 9-1-1 (W-L-D) | Inactive | |
| Jonathan Brookins | 16-10-0 (W-L-D) | Inactive | ||
| Jonathan Correa | “Puerto Rican Rambo” | Heavyweight | 0-0-0 (W-L-D) | Active |
| Jonathan Goulet | “The Road Warrior” | Welterweight | 23-12-0 (W-L-D) | Inactive |
| Jonathan Martinez | “Dragon” | Bantamweight | 19-6-0 (W-L-D) | Active |
| Jonathan Meunier | “The French Spider” | Welterweight | 8-1-0 (W-L-D) | Inactive |
| Jonathan Micallef | “The Captain” | Welterweight | 10-1-0 (W-L-D) | Active |
| Jonathan Pearce | “JSP” | Featherweight | 14-7-0 (W-L-D) | Inactive |
| Jonathan Wiezorek | “Lock N Load” | Heavyweight | 11-2-0 (W-L-D) | Inactive |
| Jonathan Wilson | “Jonny Bravo” | Middleweight | 7-3-0 (W-L-D) | Inactive |
| Jonavin Webb | “The Spyder” | Welterweight | 9-2-0 (W-L-D) | Inactive |
| Jonny Parsons | “The Sluggernaut” | Welterweight | 9-3-0 (W-L-D) | Active |
| JooSang Yoo | “Zombie Jr.” | Featherweight | 9-1-0 (W-L-D) | Active |
| Joosang Yoo | 9-1-0 (W-L-D) | Inactive | ||
| Jordan Espinosa | Flyweight | 15-9-0 (W-L-D) | Inactive | |
| Jordan Griffin | “NativePsycho” | Featherweight | 18-9-0 (W-L-D) | Inactive |
| Jordan Jackson | “The Super Saiyan” | Heavyweight | 0-0-0 (W-L-D) | Inactive |
| Jordan Johnson | Light Heavyweight | 10-0-0 (W-L-D) | Inactive | |
| Jordan Leavitt | “The Monkey King” | Featherweight | 13-4-0 (W-L-D) | Active |
| Jordan Mein | “Young Gun” | Welterweight | 31-12-0 (W-L-D) | Inactive |
| Jordan Radev | Middleweight | 23-5-0 (W-L-D) | Inactive | |
| Jordan Rinaldi | Lightweight | 14-7-0 (W-L-D) | Inactive | |
| Jordan Vucenic | “The Epidemic” | Lightweight | 13-4-0 (W-L-D) | Inactive |
| Jordan Williams | “Bomaye” | Welterweight | 9-6-0 (W-L-D) | Inactive |
| Jordan Wright | “The Beverly Hills Ninja” | Light Heavyweight | 12-5-0 (W-L-D) | Inactive |
| Jorge Gonzalez | “Street” | Light Heavyweight | 16-4-0 (W-L-D) | Inactive |
| Jorge Gurgel | “JG” | Lightweight | 14-10-0 (W-L-D) | Inactive |
| Jorge Lopez | Welterweight | 11-5-0 (W-L-D) | Inactive | |
| Jorge Masvidal | “Gamebred” | Welterweight | 35-17-0 (W-L-D) | Inactive |
| Jorge Patino | Lightweight | 38-19-2 (W-L-D) | Inactive | |
| Jorge Rivera | “El Conquistador” | Middleweight | 20-9-0 (W-L-D) | Inactive |
| Jorge Santiago | “The Sandman” | Welterweight | 25-12-0 (W-L-D) | Inactive |
| Jorge de Oliveira | “Blade” | Welterweight | 9-2-0 (W-L-D) | Inactive |
| Jorgen Kruth | “The Last Viking” | Light Heavyweight | 5-0-0 (W-L-D) | Inactive |
| Jose Alday | Bantamweight | 14-6-1 (W-L-D) | Active | |
| Jose Augusto | Light Heavyweight | 6-2-0 (W-L-D) | Active | |
| Jose Daniel Medina | “Chicho” | Middleweight | 11-7-0 (W-L-D) | Inactive |
| Jose Delano | Featherweight | 17-3-0 (W-L-D) | Active | |
| Jose Delgado | 12-2-0 (W-L-D) | Inactive | ||
| Jose Johnson | “Lobo Solitario” | Flyweight | 16-10-0 (W-L-D) | Inactive |
| Jose Maria | “No Chance” | Flyweight | 37-7-0 (W-L-D) | Inactive |
| Jose Miguel Delgado | Featherweight | 10-2-0 (W-L-D) | Active | |
| Jose Montanha da Silva | Heavyweight | 6-1-0 (W-L-D) | Active | |
| Jose Ochoa | “Kalzifer” | Flyweight | 9-2-0 (W-L-D) | Active |
| Jose Quinonez | “El Teco” | Bantamweight | 9-5-0 (W-L-D) | Inactive |
| Jose Souza | Inactive | |||
| Jose Torres | “Shorty” | Flyweight | 8-1-0 (W-L-D) | Inactive |
| Josefine Knutsson | “Thunder” | Women's Strawweight | 8-1-0 (W-L-D) | Inactive |
| Joselyne Edwards | “La Pantera” | Women's Bantamweight | 18-6-0 (W-L-D) | Active |
| Joseph Benavidez | Flyweight | 28-8-0 (W-L-D) | Inactive | |
| Joseph Gigliotti | 7-2-0 (W-L-D) | Inactive | ||
| Joseph Holmes | “Uglyman Joe” | Middleweight | 8-4-0 (W-L-D) | Inactive |
| Joseph Lowry | Lightweight | 7-2-0 (W-L-D) | Active | |
| Joseph Morales | “Bopo” | Flyweight | 15-2-0 (W-L-D) | Active |
| Joseph Sandoval | Bantamweight | 7-7-0 (W-L-D) | Inactive | |
| Josh Appelt | Heavyweight | 15-7-0 (W-L-D) | Active | |
| Josh Barnett | “The Warmaster” | Heavyweight | 35-8-0 (W-L-D) | Inactive |
| Josh Bryant | “The Beast” | Middleweight | 15-4-0 (W-L-D) | Inactive |
| Josh Clopton | “The Gentleman” | Featherweight | 6-2-1 (W-L-D) | Inactive |
| Josh Copeland | “Cuddly Bear” | Heavyweight | 12-4-0 (W-L-D) | Inactive |
| Josh Culibao | “Kuya” | Featherweight | 11-4-1 (W-L-D) | Inactive |
| Josh Emmett | “CC0 (C-C-OH)” | Featherweight | 19-7-0 (W-L-D) | Active |
| Josh Ferguson | “Taz” | Flyweight | 10-5-0 (W-L-D) | Inactive |
| Josh Fremd | Middleweight | 11-6-0 (W-L-D) | Inactive | |
| Josh Grispi | “The Fluke” | Featherweight | 14-5-0 (W-L-D) | Inactive |
| Josh Haynes | “Bring The Pain” | Welterweight | 14-11-0 (W-L-D) | Inactive |
| Josh Hendricks | “Heavy” | Heavyweight | 19-11-0 (W-L-D) | Inactive |
| Josh Hokit | Heavyweight | 10-0-0 (W-L-D) | Active | |
| Josh Koscheck | Welterweight | 17-11-0 (W-L-D) | Inactive | |
| Josh Neer | “The Dentist” | Welterweight | 36-16-1 (W-L-D) | Inactive |
| Josh Parisian | Heavyweight | 15-8-0 (W-L-D) | Active | |
| Josh Quinlan | “Bushido” | Welterweight | 6-3-0 (W-L-D) | Inactive |
| Josh Raferty | Welterweight | 0-0-0 (W-L-D) | Inactive | |
| Josh Rafferty | 9-8-0 (W-L-D) | Inactive | ||
| Josh Samman | “Anqa” | Middleweight | 13-4-0 (W-L-D) | Inactive |
| Josh Sampo | “The Gremlin” | Flyweight | 11-5-0 (W-L-D) | Inactive |
| Josh Schockman | “The War Hammer” | Heavyweight | 7-0-0 (W-L-D) | Inactive |
| Josh Shockley | Lightweight | 11-4-0 (W-L-D) | Inactive | |
| Josh Shockman | 6-3-0 (W-L-D) | Inactive | ||
| Josh Stansbury | 4-8-0 (W-L-D) | Inactive | ||
| Josh Stuart | Lightweight | 1-4-0 (W-L-D) | Inactive | |
| Josh Thomson | “The Punk” | Lightweight | 22-9-0 (W-L-D) | Inactive |
| Josh Wick | Lightweight | 12-6-0 (W-L-D) | Active | |
| Joshua Burkman | “The People's Warrior” | Welterweight | 28-16-0 (W-L-D) | Inactive |
| Joshua Stansbury | “The Sandman” | Light Heavyweight | 8-5-0 (W-L-D) | Inactive |
| C Joshua Van | “The Fearless” | Flyweight | 17-2-0 (W-L-D) | Active |
| Joshua Wang-Kim | Bantamweight | 5-2-0 (W-L-D) | Active | |
| Joshua Weems | “Wide Open” | Bantamweight | 11-3-0 (W-L-D) | Inactive |
| Joshua Weems | 11-3-0 (W-L-D) | Inactive | ||
| Josiah Harrell | “The Muscle Hamster” | Welterweight | 11-1-0 (W-L-D) | Active |
| Josiane Nunes | “Josi” | Women's Bantamweight | 10-4-0 (W-L-D) | Active |
| Josias Musasa | “The KO Wizard” | Bantamweight | 8-2-0 (W-L-D) | Active |
| José Aldo | Featherweight | 32-10-0 (W-L-D) | Inactive | |
| José Souza | “Canela” | Welterweight | 9-1-0 (W-L-D) | Active |
| Journey Newson | Bantamweight | 10-5-0 (W-L-D) | Active | |
| Jovan Leka | Heavyweight | 11-2-0 (W-L-D) | Active | |
| Juan Adams | “The Kraken” | Heavyweight | 5-3-0 (W-L-D) | Inactive |
| Juan Andres Luna | Flyweight | 12-1-0 (W-L-D) | Active | |
| Juan Diaz | “Pegajoso” | Bantamweight | 16-1-1 (W-L-D) | Active |
| Juan Espino | “El Guapo” | Heavyweight | 11-2-0 (W-L-D) | Inactive |
| Juan Manuel Puig | 11-4-0 (W-L-D) | Inactive | ||
| Juan Puerta | Flyweight | 23-6-0 (W-L-D) | Inactive | |
| Juan Puig | “Fenix” | Featherweight | 11-4-0 (W-L-D) | Inactive |
| Juancamilo Ronderos | “100” | Flyweight | 4-2-0 (W-L-D) | Active |
| Jules Bruchez | “Cotton Mouth from the South” | Light Heavyweight | 1-2-0 (W-L-D) | Inactive |
| Julia Avila | “Raging Panda” | Women's Bantamweight | 9-4-0 (W-L-D) | Inactive |
| Julia Polastri | “Psycho” | Women's Strawweight | 14-6-0 (W-L-D) | Inactive |
| Julian Erosa | “Juicy J” | Featherweight | 31-14-0 (W-L-D) | Active |
| Julian Marquez | “The Cuban Missile Crisis” | Middleweight | 9-6-0 (W-L-D) | Inactive |
| Julian Sanchez | 0-1-0 (W-L-D) | Inactive | ||
| Juliana Lima | “Ju Thai” | Women's Strawweight | 9-5-0 (W-L-D) | Inactive |
| Juliana Miller | “Killer” | Women's Flyweight | 5-4-0 (W-L-D) | Active |
| Julianna Peña | “The Venezuelan Vixen” | Women's Bantamweight | 13-6-0 (W-L-D) | Active |
| Julie Kedzie | “Fireball” | Women's Bantamweight | 16-13-0 (W-L-D) | Inactive |
| Julien Leblanc | Middleweight | 10-3-0 (W-L-D) | Active | |
| Julija Stoliarenko | Women's Flyweight | 11-10-2 (W-L-D) | Inactive | |
| Julio Arce | Featherweight | 19-6-0 (W-L-D) | Inactive | |
| Julio Paulino | “The Dominican Demon” | Welterweight | 23-5-0 (W-L-D) | Inactive |
| Julius Anglickas | Light Heavyweight | 5-1-0 (W-L-D) | Active | |
| Julius Walker | “Juice Box” | Light Heavyweight | 7-3-0 (W-L-D) | Active |
| Jumabieke Tuerxun | “Leopard” | Bantamweight | 19-4-1 (W-L-D) | Inactive |
| JunYong Park | “The Iron Turtle” | Middleweight | 19-7-0 (W-L-D) | Active |
| JunYoung Hong | Featherweight | 13-8-1 (W-L-D) | Inactive | |
| Jung Hyun Lee | Flyweight | 0-1-0 (W-L-D) | Active | |
| Junie Browning | “The Lunatic” | Lightweight | 5-6-0 (W-L-D) | Inactive |
| Junior Albini | “Baby” | Heavyweight | 14-6-0 (W-L-D) | Inactive |
| Junior Assuncao | Featherweight | 16-6-0 (W-L-D) | Inactive | |
| Junior Dos Santos | 21-9-0 (W-L-D) | Inactive | ||
| Junior Hernandez | “Hot Handed” | Bantamweight | 14-6-0 (W-L-D) | Inactive |
| Junior Tafa | “The Juggernaut” | Light Heavyweight | 7-6-0 (W-L-D) | Active |
| Junye Gao | Bantamweight | 19-12-0 (W-L-D) | Active | |
| Jussier Formiga | Flyweight | 23-8-0 (W-L-D) | Inactive | |
| Justin Buchholz | Lightweight | 15-10-0 (W-L-D) | Inactive | |
| Justin Burlinson | Welterweight | 6-1-0 (W-L-D) | Active | |
| Justin Edwards | “Fast Eddy” | Lightweight | 9-5-0 (W-L-D) | Inactive |
| Justin Eilers | Heavyweight | 19-7-1 (W-L-D) | Inactive | |
| Justin Frazier | “The Grizzlybear” | Heavyweight | 10-3-0 (W-L-D) | Inactive |
| C Justin Gaethje | “The Highlight” | Lightweight | 28-5-0 (W-L-D) | Active |
| Justin Gonzales | “J-Train” | Featherweight | 6-0-0 (W-L-D) | Active |
| Justin James | “The Pretty Boy” | Lightweight | 13-7-0 (W-L-D) | Inactive |
| Justin Jaynes | “The Guitar Hero” | Featherweight | 16-8-0 (W-L-D) | Inactive |
| Justin Jones | Middleweight | 9-2-0 (W-L-D) | Active | |
| Justin Lawrence | “The American Kidd” | Featherweight | 10-4-0 (W-L-D) | Inactive |
| Justin Ledet | “El Blanco” | Light Heavyweight | 9-4-0 (W-L-D) | Inactive |
| Justin Levens | “Executioner” | Middleweight | 10-7-0 (W-L-D) | Inactive |
| Justin Martin | 4-3-0 (W-L-D) | Inactive | ||
| Justin McCully | “The Nsane1” | Heavyweight | 11-5-2 (W-L-D) | Inactive |
| Justin Salas | “J-Bomb” | Lightweight | 12-7-0 (W-L-D) | Inactive |
| Justin Scoggins | Flyweight | 11-5-0 (W-L-D) | Inactive | |
| Justin Sumter | “The Fort” | Middleweight | 7-3-0 (W-L-D) | Inactive |
| Justin Tafa | “Bad Man” | Heavyweight | 7-5-0 (1 NC) | Inactive |
| Justin Wilcox | “Silverback” | Lightweight | 14-7-0 (W-L-D) | Inactive |
| Justin Willis | “Big Pretty” | Heavyweight | 8-2-0 (W-L-D) | Inactive |
| Justin Wren | “The Viking” | Heavyweight | 13-2-0 (W-L-D) | Inactive |
| Justine Kish | Women's Flyweight | 7-4-0 (W-L-D) | Inactive | |
| Jutaro Nakao | Welterweight | 25-19-4 (W-L-D) | Inactive | |
| Jéssica Andrade | “Bate Estaca” | Women's Strawweight | 26-15-0 (W-L-D) | Active |
| KB Bhullar | “The Bengal” | Middleweight | 8-2-0 (W-L-D) | Inactive |
| KJ Noons | Lightweight | 13-9-0 (1 NC) | Inactive | |
| Kaan Ofli | “Genghis” | Featherweight | 15-4-1 (W-L-D) | Active |
| Kai Asakura | Bantamweight | 22-6-0 (W-L-D) | Active | |
| Kai Kamaka III | “Da Fighting Hawaiian” | Featherweight | 18-8-1 (W-L-D) | Active |
| Kai Kara-France | “Don't Blink” | Flyweight | 25-12-0 (W-L-D) | Active |
| Kaik Brito | Welterweight | 16-5-0 (W-L-D) | Active | |
| Kailan Hill | Middleweight | 4-1-0 (W-L-D) | Inactive | |
| Kailin Curran | Women's Strawweight | 4-5-0 (W-L-D) | Inactive | |
| Kajan Johnson | “Ragin'” | Lightweight | 23-13-1 (W-L-D) | Inactive |
| Kaleio Romero | Featherweight | 6-2-0 (W-L-D) | Active | |
| Kali Robbins | “Pop Tart” | Women's Strawweight | 6-3-0 (W-L-D) | Inactive |
| Kalib Starnes | Middleweight | 17-11-1 (W-L-D) | Inactive | |
| Kalindra Faria | Women's Flyweight | 18-8-1 (W-L-D) | Inactive | |
| Kaloyan Kolev | Light Heavyweight | 10-1-0 (W-L-D) | Inactive | |
| Kamal Shalorus | “Prince of Persia” | Lightweight | 9-5-2 (W-L-D) | Inactive |
| Kamaru Usman | “Nigerian Nightmare” | Middleweight | 21-5-0 (W-L-D) | Active |
| Kamuela Kirk | “The Jawaiian” | Lightweight | 12-6-0 (W-L-D) | Active |
| Kanako Murata | Women's Strawweight | 12-3-0 (W-L-D) | Active | |
| Karine Gevorgyan | “Princess” | Women's Flyweight | 3-3-0 (W-L-D) | Inactive |
| Karine Silva | “Killer” | Women's Flyweight | 19-7-0 (W-L-D) | Active |
| Karl Reed | “No Worries” | Light Heavyweight | 6-1-0 (W-L-D) | Inactive |
| Karl Roberson | “Baby K” | Light Heavyweight | 9-6-0 (W-L-D) | Inactive |
| Karl Williams | Heavyweight | 10-2-0 (W-L-D) | Inactive | |
| Karlos Vemola | Middleweight | 17-5-0 (W-L-D) | Inactive | |
| Karo Parisyan | “The Heat” | Welterweight | 24-11-0 (W-L-D) | Inactive |
| Karol Rosa | Women's Bantamweight | 19-8-0 (W-L-D) | Active | |
| Karolina Kowalkiewicz | Women's Strawweight | 16-10-0 (W-L-D) | Active | |
| Karolina Wojcik | Women's Strawweight | 9-2-0 (W-L-D) | Active | |
| Kathryn Paprocki | Women's Strawweight | 3-2-0 (W-L-D) | Active | |
| Katlyn Cerminara | “Blonde Fighter” | Women's Flyweight | 18-6-0 (W-L-D) | Active |
| Katsuhisa Fuji | 0-0-0 (W-L-D) | Inactive | ||
| Katsuhisa Fujii | 9-18-1 (W-L-D) | Inactive | ||
| Katsunori Kikuno | Featherweight | 24-8-2 (W-L-D) | Inactive | |
| Kauê Fernandes | Lightweight | 11-2-0 (W-L-D) | Active | |
| Kay Hansen | Women's Strawweight | 7-6-0 (W-L-D) | Inactive | |
| C Kayla Harrison | Women's Bantamweight | 19-1-0 (W-L-D) | Active | |
| Kaynan Kruschewsky | “Bahia” | Lightweight | 15-3-0 (W-L-D) | Inactive |
| Kazuhiro Nakamura | “Kaz” | Light Heavyweight | 21-13-0 (W-L-D) | Inactive |
| Kazuki Tokudome | Lightweight | 18-7-1 (W-L-D) | Inactive | |
| Kazula Vargas | Lightweight | 12-5-0 (W-L-D) | Inactive | |
| Kazuma Maruyama | Lightweight | 11-7-0 (W-L-D) | Active | |
| Kazuo Misaki | “Hitman” | Welterweight | 25-11-2 (W-L-D) | Inactive |
| Kazushi Sakuraba | Heavyweight | 26-17-1 (W-L-D) | Inactive | |
| Keichiro Yamamiya | Middleweight | 0-0-0 (W-L-D) | Inactive | |
| Keifer Roberts | “Keif” | Heavyweight | 0-0-0 (W-L-D) | Active |
| Keigo Kunihara | Heavyweight | 3-2-0 (W-L-D) | Inactive | |
| Keiichiro Nakamura | Featherweight | 8-1-0 (W-L-D) | Active | |
| Keiichiro Yamamiya | 45-35-10 (W-L-D) | Inactive | ||
| Keisuke Sasu | “Sasuke” | Featherweight | 11-3-1 (W-L-D) | Active |
| Keita Nakamura | “K-Taro” | Welterweight | 34-10-2 (W-L-D) | Inactive |
| Keith Berish | “Sha Bang Bang” | Middleweight | 5-1-0 (W-L-D) | Inactive |
| Keith Hackney | 2-2-0 (W-L-D) | Inactive | ||
| Keith Jardine | “The Dean of Mean” | Light Heavyweight | 17-11-2 (W-L-D) | Inactive |
| Keith Mielke | 0-5-0 (W-L-D) | Inactive | ||
| Keith Rockel | “Rock” | Middleweight | 12-4-1 (W-L-D) | Inactive |
| Keith Wisniewski | “The Polish Connection” | Welterweight | 28-15-1 (W-L-D) | Inactive |
| Kelly Dullanty | “Psycho Kelly” | Lightweight | 4-2-0 (W-L-D) | Inactive |
| Kelly Faszholz | Women's Bantamweight | 4-2-0 (W-L-D) | Inactive | |
| Kelly Velasco | “Killer” | Women's Bantamweight | 2-1-0 (W-L-D) | Active |
| Kelvin Gastelum | Middleweight | 21-11-0 (W-L-D) | Active | |
| Ken Shamrock | “The World's Most Dangerous Man” | Light Heavyweight | 28-17-2 (W-L-D) | Inactive |
| Ken Stone | Bantamweight | 11-4-0 (W-L-D) | Inactive | |
| Kendall Grove | “Da Spyder” | Middleweight | 23-17-0 (W-L-D) | Inactive |
| Kenichi Yamamoto | Welterweight | 5-12-2 (W-L-D) | Inactive | |
| Kennedy Freeman | Women's Flyweight | 6-0-0 (W-L-D) | Active | |
| Kennedy Nzechukwu | “Chosen” | Heavyweight | 14-6-1 (W-L-D) | Active |
| Kenneth Bergh | Light Heavyweight | 8-0-0 (W-L-D) | Inactive | |
| Kenneth Cross | Lightweight | 11-3-0 (W-L-D) | Inactive | |
| Kenny Florian | “KenFlo” | Featherweight | 14-6-0 (W-L-D) | Inactive |
| Kenny Robertson | Welterweight | 15-5-0 (W-L-D) | Inactive | |
| Kerry Kasik | Women's Strawweight | 0-0-0 (W-L-D) | Inactive | |
| Kerry Schall | “Meat Truck” | Heavyweight | 24-13-0 (W-L-D) | Inactive |
| Kerry Vera | Women's Bantamweight | 2-0-0 (W-L-D) | Inactive | |
| Ketlen Souza | “Esquentadinha” | Women's Strawweight | 17-6-0 (W-L-D) | Active |
| Ketlen Vieira | “Fenomeno” | Women's Bantamweight | 16-5-0 (W-L-D) | Inactive |
| Kevin Aguilar | “Angel of Death” | Featherweight | 17-5-0 (W-L-D) | Inactive |
| Kevin Borjas | “El Gallo Negro” | Flyweight | 11-5-0 (W-L-D) | Active |
| Kevin Burns | “The Fire” | Welterweight | 12-7-0 (W-L-D) | Inactive |
| Kevin Casey | “King” | Middleweight | 9-5-2 (1 NC) | Inactive |
| Kevin Christian | Light Heavyweight | 9-4-0 (W-L-D) | Active | |
| Kevin Croom | “Crash” | Bantamweight | 21-15-0 (W-L-D) | Inactive |
| Kevin Ferguson | 5-2-0 (W-L-D) | Inactive | ||
| Kevin Gray | “Pocket Herc” | Flyweight | 9-4-0 (W-L-D) | Inactive |
| Kevin Holland | “Trailblazer” | Welterweight | 29-15-0 (W-L-D) | Active |
| Kevin Jackson | Middleweight | 4-2-0 (W-L-D) | Inactive | |
| Kevin Jordan | “The Shaman” | Heavyweight | 11-9-0 (W-L-D) | Inactive |
| Kevin Jousset | “Air” | Welterweight | 10-4-0 (W-L-D) | Inactive |
| Kevin Lee | “The Motown Phenom” | Welterweight | 18-8-0 (W-L-D) | Active |
| Kevin Natividad | “Quicksand” | Bantamweight | 9-4-0 (W-L-D) | Inactive |
| Kevin Randleman | “The Monster” | Light Heavyweight | 17-16-0 (W-L-D) | Inactive |
| Kevin Rosier | 2-6-0 (W-L-D) | Inactive | ||
| Kevin Souza | Featherweight | 19-4-0 (W-L-D) | Inactive | |
| Kevin Syler | “El Nino Bala” | Lightweight | 10-1-0 (W-L-D) | Active |
| Kevin Szaflarski | Heavyweight | 11-2-0 (W-L-D) | Active | |
| Kevin Vallejos | “El Chino” | Featherweight | 18-1-0 (W-L-D) | Active |
| Khabib Nurmagomedov | “The Eagle” | Lightweight | 29-0-0 (W-L-D) | Inactive |
| Khadis Ibragimov | Light Heavyweight | 8-4-0 (W-L-D) | Inactive | |
| Khadzhimurat Bestaev | Middleweight | 0-1-0 (W-L-D) | Active | |
| Khalid Murtazaliev | Middleweight | 14-2-0 (W-L-D) | Inactive | |
| Khalid Taha | “The Warrior” | Bantamweight | 13-5-0 (W-L-D) | Inactive |
| Khalil Rountree Jr. | Light Heavyweight | 15-7-0 (W-L-D) | Active | |
| Khama Worthy | “The Death Star” | Lightweight | 16-9-0 (W-L-D) | Inactive |
| Khamzat Chimaev | “Borz” | Middleweight | 15-1-0 (W-L-D) | Active |
| Khaos Williams | “The OxFighter” | Welterweight | 16-5-0 (W-L-D) | Active |
| Khusein Askhabov | “Nohcho” | Featherweight | 23-1-0 (W-L-D) | Inactive |
| Kiefer Crosbie | “BDK” | Welterweight | 10-6-0 (W-L-D) | Inactive |
| Kiichi Kunimoto | “Strasser” | Welterweight | 18-7-2 (W-L-D) | Inactive |
| Kimbo Slice | Heavyweight | 4-2-0 (W-L-D) | Inactive | |
| Kimo Leopoldo | “Kimo” | Heavyweight | 10-7-1 (W-L-D) | Inactive |
| King Green | “King” | Lightweight | 36-17-1 (W-L-D) | Active |
| Kiru Sahota | 12-3-0 (W-L-D) | Inactive | ||
| Kiru Sahota | 12-3-0 (W-L-D) | Inactive | ||
| Kit Cope | “Havoc” | Welterweight | 6-7-0 (W-L-D) | Inactive |
| Kitt Campbell | Welterweight | 16-7-0 (W-L-D) | Active | |
| Klaudia Sygula | Women's Bantamweight | 8-2-0 (W-L-D) | Active | |
| Kleydson Rodrigues | “KR” | Bantamweight | 8-4-0 (W-L-D) | Inactive |
| Klidson Abreu | “White Bear” | Light Heavyweight | 15-4-0 (W-L-D) | Inactive |
| Kody Steele | Lightweight | 8-1-0 (W-L-D) | Active | |
| Koji Kitao | 1-2-0 (W-L-D) | Inactive | ||
| Koji Oishi | Welterweight | 25-10-10 (W-L-D) | Inactive | |
| Kolton Englund | Lightweight | 9-4-0 (W-L-D) | Active | |
| Konstantin Erokhin | “The Russian Bear” | Heavyweight | 9-3-0 (W-L-D) | Inactive |
| Korey Kuppe | Welterweight | 8-4-0 (W-L-D) | Active | |
| Koya Kanda | Featherweight | 12-5-0 (W-L-D) | Active | |
| Koyomi Matsushima | Featherweight | 13-6-0 (W-L-D) | Inactive | |
| Kris McCray | “Savage” | Welterweight | 8-5-0 (W-L-D) | Inactive |
| Kris Moutinho | Bantamweight | 14-8-0 (W-L-D) | Inactive | |
| Kristian Rothaermel | “Weather Underground” | Light Heavyweight | 4-3-0 (W-L-D) | Inactive |
| Kristof Midoux | 6-10-0 (W-L-D) | Inactive | ||
| Kron Gracie | Featherweight | 5-3-0 (W-L-D) | Inactive | |
| Krzysztof Jotko | Middleweight | 24-6-0 (W-L-D) | Inactive | |
| Krzysztof Soszynski | “The Polish Experiment” | Light Heavyweight | 26-12-1 (W-L-D) | Inactive |
| Kuniyoshi Hironaka | Welterweight | 23-9-0 (W-L-D) | Inactive | |
| Kurt Holobaugh | “The Hurt” | Lightweight | 22-10-0 (W-L-D) | Inactive |
| Kurt Pellegrino | “Batman” | Lightweight | 16-7-0 (W-L-D) | Inactive |
| Kurtis Campbell | “The Pink Panther” | Featherweight | 8-1-0 (W-L-D) | Active |
| Kwan Ho Kwak | “The Handsome” | Bantamweight | 9-2-0 (W-L-D) | Inactive |
| KyeongPyo Kim | Lightweight | 1-1-0 (W-L-D) | Inactive | |
| Kyle Bochniak | “Crash” | Featherweight | 8-5-0 (W-L-D) | Inactive |
| Kyle Bradley | Lightweight | 19-12-0 (W-L-D) | Inactive | |
| Kyle Daukaus | Middleweight | 17-4-0 (W-L-D) | Active | |
| Kyle Driscoll | Featherweight | 12-3-0 (W-L-D) | Active | |
| Kyle Jensen | Welterweight | 4-11-2 (W-L-D) | Inactive | |
| Kyle Kingsbury | “Kingsbu” | Light Heavyweight | 11-6-0 (W-L-D) | Inactive |
| Kyle Nelson | “The Monster” | Lightweight | 17-7-1 (W-L-D) | Active |
| Kyle Noblitt | Heavyweight | 11-2-0 (W-L-D) | Active | |
| Kyle Noke | Welterweight | 22-10-1 (W-L-D) | Inactive | |
| Kyle Prepolec | “Killshot” | Lightweight | 18-10-0 (W-L-D) | Active |
| Kyle Reyes | Featherweight | 15-7-0 (W-L-D) | Active | |
| Kyle Stewart | “Gunz Up” | Welterweight | 11-3-0 (W-L-D) | Inactive |
| Kyle Watson | Lightweight | 13-8-1 (W-L-D) | Inactive | |
| Kyler Phillips | “The Matrix” | Bantamweight | 12-5-0 (W-L-D) | Active |
| Kyoji Horiguchi | “Karate Kid” | Flyweight | 36-6-0 (W-L-D) | Active |
| Kyron Bowen | Middleweight | 9-5-0 (W-L-D) | Inactive | |
| Kyung Ho Kang | “Mr. Perfect” | Bantamweight | 19-11-0 (W-L-D) | Inactive |
| Lance Benoist | Welterweight | 7-2-0 (W-L-D) | Inactive | |
| Lance Gibson | 4-5-0 (W-L-D) | Inactive | ||
| Lance Gibson Jr. | “Fearless” | Lightweight | 10-2-0 (W-L-D) | Active |
| Lance Lawrence | “The Tornado” | Featherweight | 4-1-0 (W-L-D) | Inactive |
| Lando Vannata | “Groovy” | Lightweight | 12-8-2 (W-L-D) | Inactive |
| Landon Quinones | “The Lone Wolf” | Lightweight | 7-3-1 (W-L-D) | Inactive |
| Lara Procopio | Women's Flyweight | 7-2-0 (W-L-D) | Inactive | |
| Larissa Pacheco | Women's Bantamweight | 10-2-0 (W-L-D) | Inactive | |
| Larry Cureton | 0-2-0 (W-L-D) | Inactive | ||
| Laureano Staropoli | “Pepi” | Middleweight | 9-5-0 (W-L-D) | Inactive |
| Lauren Mueller | “Princess Tiger” | Women's Flyweight | 5-3-0 (W-L-D) | Inactive |
| Lauren Murphy | “Lucky” | Women's Flyweight | 16-7-0 (W-L-D) | Active |
| Lavar Johnson | “Big” | Heavyweight | 18-10-0 (W-L-D) | Inactive |
| Laverne Clark | Welterweight | 27-21-1 (W-L-D) | Inactive | |
| Lawrence Lui | “Lok Yin” | Bantamweight | 8-1-0 (W-L-D) | Inactive |
| Lazar Stojadinovic | Featherweight | 12-5-0 (W-L-D) | Active | |
| Leah Letson | “Nidas” | Featherweight | 5-3-0 (W-L-D) | Inactive |
| Leandro Issa | “Brodinho” | Bantamweight | 13-6-0 (W-L-D) | Inactive |
| Leandro Silva | “Buscape” | Lightweight | 20-6-1 (W-L-D) | Inactive |
| Lee Murray | Middleweight | 8-2-1 (W-L-D) | Inactive | |
| Leigh Remedios | “The British Brawler” | Lightweight | 18-10-2 (W-L-D) | Inactive |
| Leo Kuntz | “The Lion” | Lightweight | 18-4-1 (W-L-D) | Inactive |
| Leon Aliu | Middleweight | 10-2-0 (W-L-D) | Active | |
| Leon Edwards | “Rocky” | Welterweight | 22-6-0 (1 NC) | Active |
| Leon Shahbazyan | “S.O.G.” | Welterweight | 12-5-0 (W-L-D) | Active |
| Leonard Garcia | “Bad Boy” | Featherweight | 18-13-1 (W-L-D) | Inactive |
| Leonardo Augusto Leleco | Middleweight | 11-3-0 (W-L-D) | Inactive | |
| Leonardo Damiani | Welterweight | 10-3-1 (W-L-D) | Active | |
| Leonardo De Oliveira | Middleweight | 0-0-0 (W-L-D) | Active | |
| Leonardo Guimaraes | 11-5-0 (W-L-D) | Inactive | ||
| Leonardo Mafra | “Macarrão” | Lightweight | 13-4-0 (W-L-D) | Inactive |
| Leonardo Morales | “Chimmy” | Bantamweight | 6-2-0 (W-L-D) | Inactive |
| Leonardo Santos | Lightweight | 18-7-1 (W-L-D) | Inactive | |
| Lerone Murphy | “The Miracle” | Featherweight | 17-1-1 (W-L-D) | Active |
| Lerryan Douglas | “Gunslinger” | Featherweight | 14-5-0 (W-L-D) | Active |
| Leslie Smith | “The Peacemaker” | Women's Bantamweight | 10-7-1 (W-L-D) | Inactive |
| Levan Chokheli | Welterweight | 15-3-0 (W-L-D) | Active | |
| Levan Makashvili | “The Hornet” | Featherweight | 15-2-1 (W-L-D) | Inactive |
| Levi Rodrigues Jr. | “Baby Monster” | Light Heavyweight | 0-1-0 (W-L-D) | Active |
| Lewis Gonzalez | “Lethal” | Welterweight | 11-3-0 (W-L-D) | Inactive |
| Li Jingliang | “The Leech” | Welterweight | 19-9-0 (W-L-D) | Active |
| Li Kaiwen | Featherweight | 3-2-0 (W-L-D) | Active | |
| Liana Jojua | “She Wolf” | Women's Flyweight | 8-5-0 (W-L-D) | Inactive |
| Liang Na | “The Dragon Girl” | Women's Flyweight | 19-8-0 (W-L-D) | Inactive |
| Liliya Shakirova | Women's Flyweight | 8-2-0 (W-L-D) | Inactive | |
| Lina Lansberg | “Elbow Queen” | Women's Bantamweight | 10-8-0 (W-L-D) | Inactive |
| Lisa Ellis | Women's Strawweight | 15-11-0 (W-L-D) | Inactive | |
| Liudvik Sholinian | Bantamweight | 9-4-1 (W-L-D) | Inactive | |
| Livinha Souza | “The Brazilian Gangsta” | Women's Strawweight | 14-4-0 (W-L-D) | Inactive |
| Liz Carmouche | “Girlrilla” | Women's Flyweight | 13-7-0 (W-L-D) | Inactive |
| Lodune Sincaid | Middleweight | 15-9-0 (W-L-D) | Inactive | |
| Logan Clark | “The Pink Pounder” | Middleweight | 18-6-0 (W-L-D) | Inactive |
| Logan Greenhalgh | “Tank” | Heavyweight | 0-0-0 (W-L-D) | Active |
| Logan Urban | Welterweight | 5-1-0 (W-L-D) | Inactive | |
| Loik Radzhabov | “The Tajik Tank” | Lightweight | 18-6-1 (W-L-D) | Inactive |
| Loma Lookboonmee | Women's Strawweight | 10-5-0 (W-L-D) | Active | |
| Lone’er Kavanagh | Flyweight | 10-2-0 (W-L-D) | Active | |
| Loopy Godinez | Women's Strawweight | 14-6-0 (W-L-D) | Active | |
| Lorenz Larkin | “The Monsoon” | Welterweight | 18-6-0 (W-L-D) | Inactive |
| Lorenzo Hood | Heavyweight | 14-5-0 (W-L-D) | Active | |
| Losene Keita | 16-2-0 (W-L-D) | Inactive | ||
| Louie Sutherland | “Vanilla Gorilla” | Heavyweight | 11-5-0 (W-L-D) | Active |
| Louis Cosce | Welterweight | 7-2-0 (W-L-D) | Inactive | |
| Louis Gaudinot | “Goodnight” | Flyweight | 8-4-0 (W-L-D) | Inactive |
| Louis Jourdain | Bantamweight | 9-3-0 (W-L-D) | Active | |
| Louis Lee Scott | Bantamweight | 10-0-0 (W-L-D) | Active | |
| Louis Smolka | “Da Last Samurai” | Bantamweight | 17-9-0 (W-L-D) | Inactive |
| Lowell Anderson | Middleweight | 0-1-0 (W-L-D) | Inactive | |
| Lu Kai | Featherweight | 8-5-0 (W-L-D) | Active | |
| Lu Zhengyong | Flyweight | 12-7-0 (W-L-D) | Active | |
| Luan Chagas | “Tarzan” | Welterweight | 15-3-1 (W-L-D) | Inactive |
| Luan Lacerda | Bantamweight | 13-4-0 (W-L-D) | Inactive | |
| Luana Carolina | “Dread” | Women's Bantamweight | 11-5-0 (W-L-D) | Inactive |
| Luana Pinheiro | Women's Strawweight | 11-5-0 (W-L-D) | Active | |
| Luana Santos | Women's Bantamweight | 11-2-0 (W-L-D) | Active | |
| Lucas Alexander | “The Lion” | Featherweight | 8-5-0 (W-L-D) | Inactive |
| Lucas Almeida | Featherweight | 15-5-0 (W-L-D) | Inactive | |
| Lucas Brennan | “Skywalker” | Lightweight | 11-3-0 (W-L-D) | Active |
| Lucas Fernando | Middleweight | 9-2-0 (W-L-D) | Active | |
| Lucas Martins | “Mineiro” | Featherweight | 19-3-0 (W-L-D) | Inactive |
| Lucas Rocha | “Fenomeno” | Flyweight | 18-2-0 (W-L-D) | Active |
| Lucie Pudilova | Women's Flyweight | 14-10-0 (W-L-D) | Active | |
| Lucio Linhares | “The Spartan” | Middleweight | 19-8-0 (W-L-D) | Inactive |
| Lucrezia Ria | Women's Flyweight | 8-2-0 (W-L-D) | Inactive | |
| Ludovit Klein | “Mr. Highlight” | Lightweight | 24-5-1 (W-L-D) | Active |
| Luigi Fioravanti | Welterweight | 26-15-0 (W-L-D) | Inactive | |
| Luigi Vendramini | “The Italian Stallion” | Lightweight | 9-3-0 (W-L-D) | Inactive |
| Luis Felipe Dias | 18-5-0 (W-L-D) | Inactive | ||
| Luis Gomez | “Tiger Junior” | Featherweight | 4-1-0 (W-L-D) | Active |
| Luis Gurule | “Grim” | Flyweight | 11-3-0 (W-L-D) | Active |
| Luis Henrique | “KLB” | Heavyweight | 10-5-0 (W-L-D) | Inactive |
| Luis Pajuelo | “Corazon de Leon” | Featherweight | 8-2-0 (W-L-D) | Inactive |
| Luis Pena | “Violent Bob Ross” | Lightweight | 9-3-0 (W-L-D) | Inactive |
| Luis Ramos | “Beicao” | Welterweight | 20-10-2 (W-L-D) | Inactive |
| Luis Saldana | Featherweight | 16-7-1 (W-L-D) | Inactive | |
| Luiz Cane | “Bana” | Middleweight | 17-7-0 (W-L-D) | Inactive |
| Luiz Dutra | “Besouro” | Welterweight | 13-6-1 (W-L-D) | Inactive |
| Luiz Garagorri | Featherweight | 13-2-0 (W-L-D) | Inactive | |
| Lukasz Brzeski | “The Bull” | Heavyweight | 9-7-1 (W-L-D) | Inactive |
| Lukasz Sajewski | “Wookiee” | Lightweight | 13-3-0 (W-L-D) | Inactive |
| Lukasz Sudolski | Light Heavyweight | 0-1-0 (W-L-D) | Active | |
| Luke Barnatt | “The Bigslow” | Middleweight | 13-4-0 (W-L-D) | Inactive |
| Luke Caudillo | “Lil' Hulk” | Lightweight | 17-17-0 (W-L-D) | Inactive |
| Luke Cummo | “The Silent Assassin” | Welterweight | 6-6-0 (W-L-D) | Inactive |
| Luke Fernandez | Light Heavyweight | 6-1-0 (W-L-D) | Active | |
| Luke Flores | Lightweight | 9-2-0 (W-L-D) | Inactive | |
| Luke Jumeau | “The Jedi” | Welterweight | 13-5-0 (W-L-D) | Inactive |
| Luke Riley | Featherweight | 14-0-0 (W-L-D) | Active | |
| Luke Rockhold | Middleweight | 16-6-0 (W-L-D) | Inactive | |
| Luke Sanders | “Cool Hand” | Featherweight | 13-5-0 (W-L-D) | Inactive |
| Luke Zachrich | Middleweight | 14-4-0 (W-L-D) | Inactive | |
| Lv Zhenhong | “Bull Demon King” | Featherweight | 16-6-0 (W-L-D) | Inactive |
| Lyman Good | “Cyborg” | Welterweight | 21-6-0 (W-L-D) | Active |
| Lyoto Machida | “The Dragon” | Middleweight | 24-8-0 (W-L-D) | Inactive |
| Mabelly Lima | Women's Bantamweight | 7-1-0 (W-L-D) | Inactive | |
| Mac Danzig | Lightweight | 21-12-1 (W-L-D) | Inactive | |
| Maciej Jewtuszko | “Irokez” | Lightweight | 12-3-0 (W-L-D) | Inactive |
| Mackens Semerzier | “Da Menace” | Featherweight | 8-4-0 (W-L-D) | Inactive |
| C Mackenzie Dern | Women's Strawweight | 16-5-0 (W-L-D) | Active | |
| Macy Chiasson | Women's Bantamweight | 11-6-0 (W-L-D) | Active | |
| Mads Burnell | Featherweight | 9-3-0 (W-L-D) | Inactive | |
| Magnus Cedenblad | “Jycken” | Middleweight | 14-5-0 (W-L-D) | Inactive |
| Magomed Ankalaev | Light Heavyweight | 21-2-1 (1 NC) | Active | |
| Magomed Bibulatov | “Chaborz” | Flyweight | 14-2-0 (W-L-D) | Inactive |
| Magomed Gadzhiyasulov | Light Heavyweight | 9-1-0 (W-L-D) | Inactive | |
| Magomed Mustafaev | “The Sniper” | Lightweight | 14-4-0 (W-L-D) | Inactive |
| Magomed Tuchalov | Light Heavyweight | 6-0-0 (W-L-D) | Active | |
| Magomed Zaynukov | Lightweight | 8-0-0 (W-L-D) | Active | |
| Maheshate | Lightweight | 10-5-0 (W-L-D) | Inactive | |
| Maia Stevenson | Women's Strawweight | 6-5-0 (W-L-D) | Inactive | |
| Maiara Amajanas Dos Santos | Women's Strawweight | 0-0-0 (W-L-D) | Active | |
| Maimaitituoheti Keremuaili | Bantamweight | 26-11-0 (W-L-D) | Inactive | |
| Maiquel Falcao | “Big Rig” | Middleweight | 37-10-0 (W-L-D) | Inactive |
| Mairbek Taisumov | “Beckan” | Lightweight | 27-6-0 (W-L-D) | Inactive |
| Mairon Santos | 18-1-0 (W-L-D) | Inactive | ||
| Mairon Santos | “The Legend” | Featherweight | 18-1-0 (W-L-D) | Active |
| Makhmud Muradov | Middleweight | 26-8-0 (1 NC) | Inactive | |
| Maki Pitolo | “Coconut Bombz” | Middleweight | 13-9-0 (W-L-D) | Inactive |
| Makwan Amirkhani | “Mr. Finland” | Featherweight | 17-9-0 (W-L-D) | Inactive |
| Malcolm Gordon | “X” | Flyweight | 14-8-0 (W-L-D) | Inactive |
| Malcolm Wellmaker | “The Machine” | Bantamweight | 10-2-0 (W-L-D) | Active |
| Malik Lewis | Lightweight | 6-2-0 (W-L-D) | Active | |
| Mallory Martin | Women's Strawweight | 7-5-0 (W-L-D) | Inactive | |
| Mana Martinez | “ManaBoi” | Bantamweight | 10-4-0 (W-L-D) | Inactive |
| Mandel Nallo | “Mango” | Lightweight | 14-4-0 (W-L-D) | Active |
| Mando Gutierrez | Bantamweight | 7-2-0 (W-L-D) | Inactive | |
| Mandy Böhm | “Monster” | Women's Flyweight | 8-2-0 (W-L-D) | Active |
| Manel Kape | “StarBoy” | Flyweight | 23-7-0 (W-L-D) | Active |
| Manny Bermudez | “The Bermudez Triangle” | Bantamweight | 14-2-0 (W-L-D) | Inactive |
| Manny Gamburyan | “The Anvil” | Bantamweight | 18-11-0 (W-L-D) | Inactive |
| Manny Vazquez | Flyweight | 11-2-0 (W-L-D) | Active | |
| Manoel Sousa | “Manumito” | Lightweight | 14-1-0 (W-L-D) | Active |
| Manolo Zecchini | “Angelo Veneziano” | Featherweight | 11-5-0 (W-L-D) | Active |
| Manon Fiorot | “The Beast” | Women's Flyweight | 13-2-0 (W-L-D) | Active |
| Mansur Abdul-Malik | Middleweight | 9-1-1 (W-L-D) | Active | |
| Mantas Kondratavicius | Middleweight | 9-1-0 (W-L-D) | Active | |
| Manuel Gaxhja | Lightweight | 7-0-0 (W-L-D) | Inactive | |
| Manuel Rodriguez | “Chalate” | Welterweight | 11-5-0 (W-L-D) | Inactive |
| Manuel Torres | “El Loco” | Lightweight | 17-4-0 (W-L-D) | Active |
| Manvel Gamburyan | 15-10-0 (W-L-D) | Inactive | ||
| MarQuel Mederos | Lightweight | 11-1-1 (W-L-D) | Active | |
| Mara Romero Borella | “Maravilha” | Flyweight | 12-9-0 (W-L-D) | Inactive |
| Marc Diakiese | “Bonecrusher” | Lightweight | 17-7-0 (W-L-D) | Active |
| Marc-Andre Barriault | “Powerbar” | Middleweight | 17-11-0 (W-L-D) | Active |
| Marcel Fortuna | “Maozinha” | Light Heavyweight | 9-3-0 (W-L-D) | Inactive |
| Marcello Aguiar | Welterweight | 0-0-0 (W-L-D) | Inactive | |
| Marcello Mello | Lightweight | 0-0-0 (W-L-D) | Inactive | |
| Marcelo Aguiar | 2-3-1 (W-L-D) | Inactive | ||
| Marcelo Golm | Heavyweight | 6-3-0 (W-L-D) | Inactive | |
| Marcelo Guimaraes | Middleweight | 9-2-1 (W-L-D) | Inactive | |
| Marcelo Mello | 1-0-0 (W-L-D) | Inactive | ||
| Marcelo Rojo | “Pitbull” | Featherweight | 16-10-0 (W-L-D) | Inactive |
| Marcin Bandel | “Bomba” | Lightweight | 15-7-0 (W-L-D) | Inactive |
| Marcin Held | Lightweight | 23-7-0 (W-L-D) | Inactive | |
| Marcin Prachnio | Light Heavyweight | 17-9-0 (W-L-D) | Inactive | |
| Marcin Tybura | “Tybur” | Heavyweight | 27-11-0 (W-L-D) | Active |
| Marcin Wrzosek | “The Polish Zombie” | Lightweight | 12-4-0 (W-L-D) | Inactive |
| Marcio Alexandre | “Lyoto” | Middleweight | 13-3-0 (W-L-D) | Active |
| Marcio Alexandre Junior | “Lyoto” | 17-4-0 (W-L-D) | Active | |
| Marcio Barbosa | “Ticoto” | Featherweight | 18-2-0 (W-L-D) | Active |
| Marcio Cruz | “Pe De Pano” | Heavyweight | 8-3-0 (W-L-D) | Inactive |
| Marco Beltran | “Psycho” | Flyweight | 8-6-0 (W-L-D) | Inactive |
| Marco Polo Reyes | “El Toro” | Lightweight | 8-7-0 (W-L-D) | Inactive |
| Marco Ruas | Heavyweight | 9-4-2 (W-L-D) | Inactive | |
| Marco Tulio | “Matuto” | Middleweight | 14-3-0 (W-L-D) | Active |
| Marcos Brigagao | Light Heavyweight | 11-1-0 (W-L-D) | Active | |
| Marcos Conrado Junior | Heavyweight | 0-0-0 (W-L-D) | Active | |
| Marcos Mariano | 6-6-0 (W-L-D) | Inactive | ||
| Marcos Rogerio de Lima | “Pezao” | Heavyweight | 22-10-1 (W-L-D) | Inactive |
| Marcos Rosa | “Dhalsim” | Lightweight | 6-6-0 (W-L-D) | Inactive |
| Marcos Vinicius | “Vina” | Flyweight | 23-11-1 (W-L-D) | Inactive |
| Marcus Aurelio | “Maximus” | Lightweight | 22-10-0 (W-L-D) | Inactive |
| Marcus Bossett | 1-3-0 (W-L-D) | Inactive | ||
| Marcus Brimage | “The Bama Beast” | Bantamweight | 7-7-0 (W-L-D) | Inactive |
| Marcus Buchecha | Heavyweight | 5-3-1 (W-L-D) | Active | |
| Marcus Da Silviera | “Conan” | Heavyweight | 0-0-0 (W-L-D) | Inactive |
| Marcus Davis | “The Irish Hand Grenade” | Lightweight | 22-11-0 (W-L-D) | Inactive |
| Marcus Jones | “Big Baby” | Heavyweight | 4-2-0 (W-L-D) | Inactive |
| Marcus LeVesseur | “The Prospect” | Lightweight | 22-7-0 (W-L-D) | Inactive |
| Marcus McGhee | “The Maniac” | Bantamweight | 11-2-0 (W-L-D) | Active |
| Marcus Silveira | 6-4-0 (W-L-D) | Inactive | ||
| Marek Bujlo | “Bujdzilla” | Heavyweight | 6-1-0 (W-L-D) | Inactive |
| Maria Oliveira | “Spider Girl” | Women's Strawweight | 13-7-0 (W-L-D) | Inactive |
| Maria Silva | Women's Strawweight | 8-1-0 (W-L-D) | Active | |
| Marilia Santos | Women's Flyweight | 10-3-0 (W-L-D) | Active | |
| Marina Rodriguez | Women's Strawweight | 17-6-2 (W-L-D) | Inactive | |
| Mario Bautista | Bantamweight | 18-3-0 (W-L-D) | Active | |
| Mario Miranda | Middleweight | 14-7-0 (W-L-D) | Inactive | |
| Mario Neto | “Sukata” | Heavyweight | 13-5-0 (W-L-D) | Inactive |
| Mario Pinto | Heavyweight | 12-0-0 (W-L-D) | Active | |
| Mario Sousa | “Coração Valente” | Middleweight | 15-3-0 (W-L-D) | Active |
| Marion Reneau | “The Belizean Bruiser” | Women's Bantamweight | 9-8-1 (W-L-D) | Inactive |
| Mariusz Ksiazkiewicz | Middleweight | 8-1-0 (W-L-D) | Active | |
| Mariya Agapova | “Money Mashka” | Women's Flyweight | 10-5-0 (W-L-D) | Inactive |
| Mark Bocek | Lightweight | 12-5-0 (W-L-D) | Inactive | |
| Mark Cherico | “The Pride of Bloomfield” | Featherweight | 11-1-0 (W-L-D) | Inactive |
| Mark Choinski | “The Shark” | Lightweight | 8-1-0 (W-L-D) | Active |
| Mark Climaco | Flyweight | 9-2-0 (W-L-D) | Active | |
| Mark Coleman | “The Hammer” | Light Heavyweight | 16-10-0 (W-L-D) | Inactive |
| Mark David Robinson | “White Rhino” | Heavyweight | 1-0-0 (W-L-D) | Inactive |
| Mark De La Rosa | “Bumblebee” | Bantamweight | 11-5-0 (W-L-D) | Inactive |
| Mark Eddiva | Featherweight | 6-3-0 (W-L-D) | Inactive | |
| Mark Godbeer | “The Hand Of” | Heavyweight | 13-4-0 (W-L-D) | Inactive |
| Mark Hall | 5-6-0 (W-L-D) | Inactive | ||
| Mark Holst | “Boots” | Lightweight | 12-6-0 (W-L-D) | Inactive |
| Mark Hominick | “The Machine” | Featherweight | 20-12-0 (W-L-D) | Inactive |
| Mark Hughes | Middleweight | 6-2-0 (W-L-D) | Inactive | |
| Mark Hunt | “Super Samoan” | Heavyweight | 13-14-1 (W-L-D) | Inactive |
| Mark Kerr | “The Smashing Machine” | Heavyweight | 15-11-0 (W-L-D) | Inactive |
| Mark Madsen | “The Olympian” | Lightweight | 12-2-0 (W-L-D) | Inactive |
| Mark Munoz | “The Filipino Wrecking Machine” | Middleweight | 14-6-0 (W-L-D) | Inactive |
| Mark Robinson | 1-0-0 (W-L-D) | Inactive | ||
| Mark Scanlon | Welterweight | 9-2-0 (W-L-D) | Inactive | |
| Mark Schultz | 1-1-0 (W-L-D) | Inactive | ||
| Mark Striegl | “Mugen” | Featherweight | 18-4-0 (W-L-D) | Inactive |
| Mark Vologdin | Bantamweight | 12-4-2 (W-L-D) | Active | |
| Mark Weir | Middleweight | 21-18-1 (W-L-D) | Inactive | |
| Markus Perez | “Maluko” | Middleweight | 12-5-0 (W-L-D) | Inactive |
| Marlon Moraes | “Magic” | Bantamweight | 23-10-1 (W-L-D) | Inactive |
| Marlon Vera | “Chito” | Bantamweight | 23-12-1 (W-L-D) | Active |
| Marnic Mann | “The Sawed-Off Savage” | Women's Strawweight | 6-3-0 (W-L-D) | Active |
| Martin Bravo | “El Toro” | Featherweight | 11-3-0 (W-L-D) | Inactive |
| Martin Buday | “Badys” | Heavyweight | 16-2-0 (W-L-D) | Inactive |
| Martin Buschkamp | “Barracuda” | Featherweight | 9-0-0 (W-L-D) | Inactive |
| Martin Day | “The Spartan” | Featherweight | 8-6-0 (W-L-D) | Inactive |
| Martin Kampmann | “The Hitman” | Welterweight | 20-7-0 (W-L-D) | Inactive |
| Martin Mishtaku | “Booth” | Heavyweight | 0-0-0 (W-L-D) | Inactive |
| Martin Sano | “Spartan” | Welterweight | 4-3-1 (W-L-D) | Inactive |
| Martin Svensson | “Big Swede” | Lightweight | 15-6-0 (W-L-D) | Inactive |
| Marvin Eastman | “The Beastman” | Middleweight | 18-15-1 (W-L-D) | Inactive |
| Marvin Vettori | “The Italian Dream” | Middleweight | 19-10-1 (W-L-D) | Active |
| Marwan Rahiki | “Freaky” | Featherweight | 9-0-0 (W-L-D) | Active |
| Maryna Moroz | “Iron Lady” | Women's Flyweight | 11-6-0 (W-L-D) | Inactive |
| Masanori Kanehara | Bantamweight | 26-12-5 (W-L-D) | Inactive | |
| Mashrabjon Ruzibaev | “Black Junior” | Lightweight | 20-4-1 (W-L-D) | Inactive |
| Masio Fullen | Featherweight | 11-7-0 (W-L-D) | Inactive | |
| Mason Jones | “The Dragon” | Lightweight | 18-2-0 (1 NC) | Active |
| Masutatsu Yano | 2-4-1 (W-L-D) | Inactive | ||
| Mateo Vogel | Featherweight | 8-3-0 (W-L-D) | Active | |
| Mateus Mendonça | “Bocao” | Flyweight | 10-3-0 (W-L-D) | Active |
| Mateusz Gamrot | “Gamer” | Lightweight | 26-4-0 (W-L-D) | Active |
| Mateusz Rębecki | Lightweight | 20-5-0 (W-L-D) | Active | |
| Matheus Camilo | “Jaguar” | Lightweight | 11-3-0 (W-L-D) | Active |
| Matheus Nicolau | Flyweight | 19-6-1 (W-L-D) | Inactive | |
| Matheus Scheffel | Light Heavyweight | 14-7-0 (W-L-D) | Inactive | |
| Mats Nilsson | Welterweight | 11-4-1 (W-L-D) | Inactive | |
| Matt Andersen | 14-8-1 (W-L-D) | Inactive | ||
| Matt Arroyo | “No Regard” | Welterweight | 3-3-0 (W-L-D) | Inactive |
| Matt Bessette | “The Mangler” | Featherweight | 22-9-0 (W-L-D) | Inactive |
| Matt Brown | “The Immortal” | Welterweight | 26-19-0 (W-L-D) | Inactive |
| Matt Dixon | Welterweight | 9-1-0 (W-L-D) | Active | |
| Matt Dwyer | Welterweight | 9-4-0 (W-L-D) | Inactive | |
| Matt Frevola | “The SteamRolla” | Lightweight | 11-6-1 (W-L-D) | Active |
| Matt Grice | “The Real One” | Featherweight | 15-5-0 (W-L-D) | Inactive |
| Matt Hamill | “The Hammer” | Light Heavyweight | 12-8-0 (W-L-D) | Inactive |
| Matt Hobar | “The Crowbar” | Bantamweight | 9-3-0 (W-L-D) | Inactive |
| Matt Horwich | “Suave, Sabretooth” | Middleweight | 24-11-1 (W-L-D) | Inactive |
| Matt Horwich. | 30-25-1 (W-L-D) | Active | ||
| Matt Hughes | Welterweight | 45-9-0 (W-L-D) | Inactive | |
| Matt Lindland | “The Law” | Middleweight | 22-9-0 (W-L-D) | Inactive |
| Matt Lucas | “Luke Duke” | Light Heavyweight | 15-3-0 (W-L-D) | Inactive |
| Matt Mitrione | Heavyweight | 12-5-0 (W-L-D) | Inactive | |
| Matt Sayles | Lightweight | 8-4-0 (W-L-D) | Inactive | |
| Matt Schnell | “Danger” | Flyweight | 17-11-0 (W-L-D) | Inactive |
| Matt Serra | “The Terror” | Welterweight | 11-7-0 (W-L-D) | Inactive |
| Matt Van Buren | “Gutter” | Light Heavyweight | 7-6-0 (W-L-D) | Inactive |
| Matt Veach | Lightweight | 17-5-0 (W-L-D) | Inactive | |
| Matt Wiman | Lightweight | 16-10-0 (W-L-D) | Inactive | |
| Matthew Lopez | Bantamweight | 10-4-0 (W-L-D) | Inactive | |
| Matthew Riddle | “Deep Waters” | Welterweight | 8-3-0 (W-L-D) | Inactive |
| Matthew Semelsberger | “Semi the Jedi” | Welterweight | 11-8-0 (W-L-D) | Inactive |
| Matthieu Letho Duclos | Middleweight | 0-1-0 (W-L-D) | Inactive | |
| Matěj Peňáz | Middleweight | 6-1-0 (W-L-D) | Active | |
| Maurice Greene | “The Crochet Boss” | Heavyweight | 9-7-0 (W-L-D) | Inactive |
| Maurice Mitchell | Featherweight | 11-2-0 (W-L-D) | Inactive | |
| Maurice Smith | “Mo” | Heavyweight | 12-14-0 (W-L-D) | Inactive |
| Mauricio Rua | “Shogun” | Light Heavyweight | 27-14-1 (W-L-D) | Inactive |
| Mauricio Ruffy | Lightweight | 14-2-0 (W-L-D) | Active | |
| Max Gimenis | Heavyweight | 6-2-0 (W-L-D) | Active | |
| Max Griffin | “Pain” | Welterweight | 20-13-0 (W-L-D) | Inactive |
| Max Grishin | “Maximus” | Light Heavyweight | 32-10-2 (W-L-D) | Inactive |
| Max Holloway | “Blessed” | Lightweight | 27-9-0 (W-L-D) | Active |
| Max Mustaki | “Mad” | Lightweight | 6-3-0 (W-L-D) | Active |
| Max Rohskopf | “Rated R” | Lightweight | 5-1-0 (W-L-D) | Inactive |
| Maximo Blanco | “Maxi” | Featherweight | 12-8-1 (W-L-D) | Inactive |
| Mayana Kellem | Women's Bantamweight | 7-1-0 (W-L-D) | Inactive | |
| Maycee Barber | “The Future” | Women's Flyweight | 15-3-0 (W-L-D) | Active |
| Mayra Bueno Silva | “Sheetara” | Women's Bantamweight | 10-7-1 (W-L-D) | Inactive |
| Megan Anderson | Featherweight | 11-5-0 (W-L-D) | Inactive | |
| Mehdi Baghdad | “The Sultan” | Lightweight | 11-5-0 (W-L-D) | Inactive |
| Melinda Fábián | Women's Flyweight | 4-4-2 (W-L-D) | Inactive | |
| Melissa Croden | “Scare” | Women's Bantamweight | 8-3-0 (W-L-D) | Active |
| Melissa Gatto | Women's Flyweight | 9-3-2 (W-L-D) | Active | |
| Melissa Martinez | “Super Mely” | Women's Strawweight | 8-2-0 (W-L-D) | Inactive |
| Melissa Mullins | “No Mess” | Women's Bantamweight | 7-3-0 (W-L-D) | Inactive |
| Melquizael Costa | “The Dalmatian” | Featherweight | 26-7-0 (W-L-D) | Active |
| Melsik Baghdasaryan | “The Gun” | Featherweight | 8-4-0 (W-L-D) | Active |
| Melton Bowen | 0-1-0 (W-L-D) | Inactive | ||
| Melvin Guillard | “The Young Assassin” | Lightweight | 32-18-2 (1 NC) | Inactive |
| Merab Dvalishvili | “The Machine” | Bantamweight | 21-5-0 (W-L-D) | Active |
| Michael Aswell Jr. | Inactive | |||
| Michael Aswell Jr. | “The Texas Kid” | Featherweight | 11-5-0 (W-L-D) | Active |
| Michael Bisping | “The Count” | Middleweight | 30-9-0 (W-L-D) | Inactive |
| Michael Bonnette | “No Mercy” | Welterweight | 0-0-0 (W-L-D) | Active |
| Michael Chandler | “Iron” | Lightweight | 23-11-0 (W-L-D) | Active |
| Michael Chiesa | “Maverick” | Welterweight | 20-7-0 (W-L-D) | Inactive |
| Michael Cora | Welterweight | 4-1-0 (W-L-D) | Active | |
| Michael Graves | Welterweight | 6-0-1 (W-L-D) | Inactive | |
| Michael Johnson | “The Menace” | Lightweight | 25-20-0 (W-L-D) | Active |
| Michael Kuiper | Middleweight | 15-5-0 (W-L-D) | Inactive | |
| Michael Lombardo | “The Don” | Welterweight | 11-2-0 (W-L-D) | Inactive |
| Michael McBride | Lightweight | 8-3-0 (W-L-D) | Inactive | |
| Michael McDonald | “Mayday” | Bantamweight | 17-4-0 (W-L-D) | Inactive |
| Michael Morales | Welterweight | 19-0-0 (W-L-D) | Active | |
| Michael Oliveira | Welterweight | 9-0-0 (W-L-D) | Active | |
| Michael Patt | Light Heavyweight | 12-4-0 (W-L-D) | Inactive | |
| Michael Smith | “Slap Jesus” | Welterweight | 0-0-0 (W-L-D) | Inactive |
| Michael Trizano | “The Lone Wolf” | Featherweight | 11-3-0 (W-L-D) | Inactive |
| Michael Venom Page | “Venom” | Welterweight | 25-3-0 (W-L-D) | Active |
| Michal Figlak | “Mad Dog” | Lightweight | 8-2-0 (W-L-D) | Inactive |
| Michal Martinek | “Blackbeard” | Heavyweight | 7-1-0 (W-L-D) | Active |
| Michal Oleksiejczuk | “Hussar” | Middleweight | 22-10-0 (W-L-D) | Active |
| Micheal Gillmore | “The Gentleman” | Welterweight | 6-5-0 (W-L-D) | Inactive |
| Michel Batista | “El Panda” | Heavyweight | 4-1-0 (W-L-D) | Inactive |
| Michel Pereira | “Demolidor” | Middleweight | 32-15-0 (W-L-D) | Inactive |
| Michel Prazeres | “Tractor” | Welterweight | 26-4-0 (W-L-D) | Inactive |
| Michel Quinones | “Capo” | Lightweight | 8-3-0 (W-L-D) | Inactive |
| Michelle Montague | “The Wild One” | Women's Bantamweight | 8-0-0 (W-L-D) | Active |
| Michelle Waterson-Gomez | “The Karate Hottie” | Women's Strawweight | 18-13-0 (W-L-D) | Inactive |
| Michihiro Omigawa | “Micci” | Featherweight | 17-14-1 (W-L-D) | Inactive |
| Michinori Tanaka | Bantamweight | 11-3-0 (W-L-D) | Inactive | |
| Mick Parkin | Heavyweight | 10-1-0 (W-L-D) | Inactive | |
| Mickael Lebout | “Ragnar” | Lightweight | 16-7-1 (W-L-D) | Inactive |
| Mickey Gall | Welterweight | 7-7-0 (W-L-D) | Active | |
| Micol Di Segni | Women's Strawweight | 7-3-0 (W-L-D) | Inactive | |
| Miesha Tate | “Cupcake” | Women's Bantamweight | 20-10-0 (W-L-D) | Active |
| Miguel Angel Torres | Bantamweight | 39-5-0 (W-L-D) | Inactive | |
| Miguel Baeza | “Caramel Thunder” | Welterweight | 10-4-0 (W-L-D) | Inactive |
| Miguel Torres | 44-9-0 (W-L-D) | Inactive | ||
| Mike Breeden | “Money” | Lightweight | 11-6-0 (W-L-D) | Inactive |
| Mike Brown | Featherweight | 26-9-0 (W-L-D) | Inactive | |
| Mike Ciesnolevicz | “Mike C” | Light Heavyweight | 19-4-0 (W-L-D) | Inactive |
| Mike Davis | “Beast Boy” | Lightweight | 12-3-0 (W-L-D) | Active |
| Mike De La Torre | “El Cucuy” | Featherweight | 14-7-0 (W-L-D) | Inactive |
| Mike Easton | “The Hulk” | Bantamweight | 13-6-0 (W-L-D) | Inactive |
| Mike Grundy | Featherweight | 12-4-0 (W-L-D) | Inactive | |
| Mike Guymon | “The Joker” | Welterweight | 15-6-1 (W-L-D) | Inactive |
| Mike Jackson | “The Truth” | Welterweight | 1-2-0 (W-L-D) | Inactive |
| Mike King | Middleweight | 5-1-0 (W-L-D) | Inactive | |
| Mike Kyle | “MAK” | Light Heavyweight | 22-14-1 (W-L-D) | Inactive |
| Mike Lullo | Featherweight | 8-3-0 (W-L-D) | Inactive | |
| Mike Malott | “Proper” | Welterweight | 14-2-1 (W-L-D) | Active |
| Mike Massenzio | “The Master of Disaster” | Middleweight | 13-9-0 (W-L-D) | Inactive |
| Mike Nickels | Light Heavyweight | 9-5-0 (W-L-D) | Inactive | |
| Mike Perry | “Platinum” | Welterweight | 14-8-0 (W-L-D) | Inactive |
| Mike Pierce | Welterweight | 17-7-0 (W-L-D) | Inactive | |
| Mike Pyle | “Quicksand” | Welterweight | 27-14-1 (W-L-D) | Inactive |
| Mike Rhodes | “Biggie” | Welterweight | 10-5-0 (W-L-D) | Inactive |
| Mike Ricci | “The Martian” | Lightweight | 11-5-0 (W-L-D) | Inactive |
| Mike Rio | “The Wolverine” | Lightweight | 10-5-0 (W-L-D) | Inactive |
| Mike Rodriguez | “Slo” | Light Heavyweight | 11-7-0 (W-L-D) | Inactive |
| Mike Russow | Heavyweight | 15-3-0 (W-L-D) | Inactive | |
| Mike Santiago | “Little Bully” | Featherweight | 19-12-0 (W-L-D) | Inactive |
| Mike Stumpf | Welterweight | 11-4-0 (W-L-D) | Inactive | |
| Mike Swick | “Quick” | Welterweight | 15-6-0 (W-L-D) | Inactive |
| Mike Van Arsdale | Light Heavyweight | 8-5-0 (W-L-D) | Inactive | |
| Mike Wessel | “The Juggernaut” | Heavyweight | 15-8-0 (W-L-D) | Inactive |
| Mike Whitehead | “Iron” | Light Heavyweight | 27-8-0 (W-L-D) | Inactive |
| Mike Wilkinson | “The Warrior” | Featherweight | 9-4-0 (W-L-D) | Inactive |
| Mikey Burnett | “The Eastside Assassin” | Lightweight | 5-2-0 (W-L-D) | Inactive |
| Mikey Gonzalez | Lightweight | 7-2-0 (W-L-D) | Inactive | |
| Milana Dudieva | Women's Bantamweight | 11-6-0 (W-L-D) | Inactive | |
| Miles Johns | “Chapo” | Bantamweight | 15-5-0 (W-L-D) | Active |
| Milton Vieira | “Miltinho” | Featherweight | 13-8-2 (W-L-D) | Inactive |
| MinWoo Kim | Bantamweight | 10-2-0 (W-L-D) | Inactive | |
| Minoki Ichihara | 0-1-0 (W-L-D) | Inactive | ||
| Minotauro Nogueira | Heavyweight | 34-10-1 (W-L-D) | Inactive | |
| Miranda Granger | “Danger” | Women's Strawweight | 7-3-0 (W-L-D) | Inactive |
| Miranda Maverick | “Fear The” | Women's Flyweight | 17-6-0 (W-L-D) | Active |
| Mirko Cro Cop | Heavyweight | 31-11-2 (W-L-D) | Inactive | |
| Mirko Filipovic | 35-11-2 (W-L-D) | Inactive | ||
| Mirsad Bektic | Featherweight | 13-4-0 (W-L-D) | Inactive | |
| Misha Cirkunov | Light Heavyweight | 15-9-0 (W-L-D) | Inactive | |
| Mitch Clarke | “Danger Zone” | Lightweight | 11-5-0 (W-L-D) | Inactive |
| Mitch Gagnon | Bantamweight | 12-5-0 (W-L-D) | Inactive | |
| Mitch Ramirez | Lightweight | 8-4-0 (W-L-D) | Active | |
| Mitch Raposo | Flyweight | 11-3-0 (W-L-D) | Active | |
| Mitchell Sipe | “The Sniper” | Heavyweight | 4-1-0 (W-L-D) | Active |
| Mizuki | Women's Strawweight | 16-6-0 (W-L-D) | Active | |
| Mizuto Hirota | “Pugnus” | Lightweight | 18-10-2 (W-L-D) | Inactive |
| Mo Miller | Bantamweight | 6-0-0 (W-L-D) | Active | |
| Modestas Bukauskas | “The Baltic Gladiator” | Light Heavyweight | 20-7-0 (W-L-D) | Active |
| Mohammad Yahya | “The UAE Warrior” | Featherweight | 12-6-0 (W-L-D) | Inactive |
| Mohammed Usman | “The Motor” | Heavyweight | 12-4-0 (W-L-D) | Inactive |
| Molly McCann | “Meatball” | Women's Strawweight | 14-8-0 (W-L-D) | Inactive |
| Montana De La Rosa | Women's Flyweight | 13-9-1 (W-L-D) | Inactive | |
| Montel Jackson | “Quik” | Bantamweight | 15-4-0 (W-L-D) | Active |
| Montrel Talbert | “Bone” | Middleweight | 0-0-0 (W-L-D) | Active |
| Montse Rendon | 7-2-0 (W-L-D) | Inactive | ||
| Montse Rendon | “Monster” | Women's Bantamweight | 7-2-0 (W-L-D) | Inactive |
| Montserrat Conejo Ruiz | Women's Strawweight | 10-5-0 (W-L-D) | Active | |
| Montserrat Conejo Ruiz | 10-5-0 (W-L-D) | Inactive | ||
| Morgan Charriere | “The Last Pirate” | Featherweight | 21-12-1 (W-L-D) | Active |
| Mostapha Al Turk | Heavyweight | 6-6-0 (W-L-D) | Inactive | |
| Moti Horenstein | Heavyweight | 1-6-0 (W-L-D) | Inactive | |
| Motonobu Tezuka | Bantamweight | 28-12-7 (W-L-D) | Inactive | |
| Mounir Lazzez | “The Sniper” | Welterweight | 11-3-0 (W-L-D) | Inactive |
| Movsar Evloev | Featherweight | 20-0-0 (W-L-D) | Active | |
| Muhammad Mokaev | “The Punisher” | Flyweight | 13-0-0 (W-L-D) | Inactive |
| Muhammad Naimov | “Hillman” | Featherweight | 13-4-0 (W-L-D) | Active |
| Muhammad Said | “Kubik” | Light Heavyweight | 9-0-0 (W-L-D) | Active |
| Muin Gafurov | “Tajiik” | Bantamweight | 20-7-0 (W-L-D) | Active |
| Murilo Bustamante | Middleweight | 15-8-1 (W-L-D) | Inactive | |
| Murtaza Talha | Light Heavyweight | 7-2-0 (W-L-D) | Active | |
| Murtazali Magomedov | “The Highlight” | Featherweight | 11-0-0 (W-L-D) | Active |
| Muslim Salikhov | “King of Kung Fu” | Welterweight | 22-6-0 (W-L-D) | Active |
| Myktybek Orolbai | “Krygyz” | Welterweight | 16-2-1 (W-L-D) | Active |
| Myles Jury | “Fury” | Featherweight | 17-4-0 (W-L-D) | Inactive |
| Nad Narimani | “Smiler” | Featherweight | 12-4-0 (W-L-D) | Inactive |
| Nadia Kassem | Women's Flyweight | 5-2-0 (W-L-D) | Inactive | |
| Nah-Shon Burrell | “The Rock n Rolla” | Welterweight | 15-7-0 (W-L-D) | Inactive |
| Nair Nelikyan | Lightweight | 0-0-0 (W-L-D) | Active | |
| Nam Phan | Bantamweight | 21-17-0 (W-L-D) | Inactive | |
| Nandor Guelmino | “The Hun” | Heavyweight | 11-5-1 (W-L-D) | Inactive |
| Naoki Inoue | Flyweight | 11-1-0 (W-L-D) | Inactive | |
| Naoyuki Kotani | Lightweight | 34-14-7 (W-L-D) | Inactive | |
| Nariman Abbassov | Lightweight | 0-1-0 (W-L-D) | Active | |
| Nasrat Haqparast | Lightweight | 18-6-0 (W-L-D) | Active | |
| Nasrudin Nasrudinov | Light Heavyweight | 9-1-0 (W-L-D) | Active | |
| Nassourdine Imavov | “The Sniper” | Middleweight | 17-4-0 (1 NC) | Active |
| Natalia Silva | Women's Flyweight | 20-5-1 (W-L-D) | Active | |
| Natan Levy | Lightweight | 8-2-0 (W-L-D) | Active | |
| Nate Diaz | Welterweight | 22-13-0 (W-L-D) | Inactive | |
| Nate Landwehr | “The Train” | Featherweight | 18-8-0 (W-L-D) | Active |
| Nate Loughran | Middleweight | 11-2-0 (W-L-D) | Inactive | |
| Nate Maness | “Mayhem” | Flyweight | 16-3-0 (W-L-D) | Inactive |
| Nate Marquardt | “The Great” | Middleweight | 35-19-2 (W-L-D) | Inactive |
| Nate Mohr | Lightweight | 9-7-0 (W-L-D) | Inactive | |
| Nate Quarry | “Rock” | Middleweight | 12-4-0 (W-L-D) | Inactive |
| Nate Schroeder | Heavyweight | 11-10-0 (W-L-D) | Inactive | |
| Nate Smith | Flyweight | 6-1-0 (W-L-D) | Inactive | |
| Nathan Coy | “Soulforce” | Welterweight | 15-7-0 (W-L-D) | Inactive |
| Nathan Fletcher | Bantamweight | 9-3-0 (W-L-D) | Inactive | |
| Nathaniel Wood | “The Last Kingsman” | Featherweight | 23-6-0 (W-L-D) | Active |
| Navajo Stirling | Light Heavyweight | 10-0-0 (W-L-D) | Active | |
| Nayara Maia | Women's Flyweight | 7-1-1 (W-L-D) | Active | |
| Nazareno Malegarie | “El Tigre” | Lightweight | 28-4-0 (W-L-D) | Inactive |
| Nazim Sadykhov | “Black Wolf” | Lightweight | 11-3-1 (W-L-D) | Active |
| Neil Grove | “Goliath” | Heavyweight | 12-8-1 (W-L-D) | Inactive |
| Neil Magny | “The Haitian Sensation” | Welterweight | 31-15-0 (W-L-D) | Active |
| Neil Seery | “2Tap” | Flyweight | 16-13-0 (W-L-D) | Inactive |
| Neil Wain | “Old Skool” | Heavyweight | 13-4-0 (W-L-D) | Inactive |
| Nicco Montano | Women's Bantamweight | 5-3-0 (W-L-D) | Inactive | |
| Nicholas Musoke | 13-5-0 (W-L-D) | Inactive | ||
| Nick Agallar | Lightweight | 24-6-0 (W-L-D) | Inactive | |
| Nick Aguirre | “Slick” | Bantamweight | 7-2-0 (W-L-D) | Inactive |
| Nick Catone | “The Jersey Devil” | Middleweight | 10-4-0 (W-L-D) | Inactive |
| Nick Denis | “The Ninja of Love” | Bantamweight | 11-3-0 (W-L-D) | Inactive |
| Nick Diaz | Middleweight | 26-10-0 (W-L-D) | Active | |
| Nick Fiore | Lightweight | 6-2-0 (W-L-D) | Inactive | |
| Nick Hein | “Sergeant” | Lightweight | 14-5-0 (W-L-D) | Inactive |
| Nick Klein | “Blue Collar” | Middleweight | 6-3-0 (W-L-D) | Active |
| Nick Maximov | Middleweight | 8-2-0 (W-L-D) | Inactive | |
| Nick Newell | Lightweight | 14-2-0 (W-L-D) | Active | |
| Nick Osipczak | “Slick” | Welterweight | 6-3-0 (W-L-D) | Inactive |
| Nick Pace | Bantamweight | 8-3-0 (W-L-D) | Inactive | |
| Nick Penner | “The Quiet Assassin” | Light Heavyweight | 11-3-0 (W-L-D) | Inactive |
| Nick Ring | “The Promise” | Middleweight | 14-4-0 (W-L-D) | Inactive |
| Nick Roehrick | Light Heavyweight | 7-1-0 (W-L-D) | Inactive | |
| Nick Sanzo | Lightweight | 1-1-0 (W-L-D) | Inactive | |
| Nick Serra | Welterweight | 7-3-0 (W-L-D) | Inactive | |
| Nick Thompson | “The Goat” | Welterweight | 38-14-1 (W-L-D) | Inactive |
| Nick Urso | Flyweight | 10-3-0 (W-L-D) | Active | |
| Nico Musoke | Welterweight | 13-5-0 (W-L-D) | Inactive | |
| Nicolae Negumereanu | Light Heavyweight | 13-2-0 (W-L-D) | Active | |
| Nicolas Dalby | “Danish Dynamite” | Welterweight | 24-6-1 (W-L-D) | Active |
| Nicolle Caliari | Women's Strawweight | 9-4-0 (W-L-D) | Active | |
| Nik Lentz | “The Carny” | Featherweight | 30-12-2 (W-L-D) | Inactive |
| Nikita Krylov | “The Miner” | Light Heavyweight | 31-12-0 (W-L-D) | Active |
| Niklas Backstrom | Featherweight | 11-3-0 (W-L-D) | Inactive | |
| Niklas Stolze | “Green Mask” | Lightweight | 12-6-0 (W-L-D) | Inactive |
| Niko Price | “The Hybrid” | Welterweight | 16-11-0 (W-L-D) | Active |
| Nikolas Motta | “Iron” | Lightweight | 15-6-0 (W-L-D) | Active |
| Nikolay Veretennikov | “Gladiator” | Welterweight | 14-7-0 (W-L-D) | Active |
| Nina Milosevic | Women's Bantamweight | 8-1-0 (W-L-D) | Active | |
| Nina Nunes | Women's Flyweight | 11-7-0 (W-L-D) | Inactive | |
| Ning Guangyou | Bantamweight | 6-4-1 (W-L-D) | Inactive | |
| Nissen Osterneck | Middleweight | 12-4-0 (W-L-D) | Inactive | |
| Niushiyue Ji | Flyweight | 2-2-0 (W-L-D) | Inactive | |
| Noad Lahat | “Neo” | Featherweight | 11-2-0 (W-L-D) | Inactive |
| Noe Hernandez | Middleweight | 5-5-0 (W-L-D) | Inactive | |
| Nohelin Hernandez | “Suave” | Bantamweight | 9-4-0 (W-L-D) | Inactive |
| Nolan Ticman | Flyweight | 4-3-0 (W-L-D) | Inactive | |
| Nora Cornolle | Women's Bantamweight | 9-4-0 (W-L-D) | Active | |
| Nordine Taleb | Welterweight | 15-7-0 (W-L-D) | Inactive | |
| Norifumi Yamamoto | “Kid” | Bantamweight | 18-6-0 (1 NC) | Inactive |
| Norma Dumont | “The Immortal” | Women's Bantamweight | 13-3-0 (W-L-D) | Active |
| Norman Parke | “Stormin” | Lightweight | 23-6-1 (W-L-D) | Inactive |
| Nueraji Taiyilake | “Super Saiyan” | Lightweight | 12-1-0 (W-L-D) | Active |
| Nursulton Ruziboev | “Black” | Middleweight | 37-9-2 (W-L-D) | Active |
| Nurullo Aliev | “Tajik Eagle” | Lightweight | 11-0-0 (W-L-D) | Active |
| Nyamjargal Tumendemberel | “Art of Knockout” | Flyweight | 10-1-0 (W-L-D) | Active |
| Oban Elliott | “The Welsh Gangster” | Welterweight | 12-4-0 (W-L-D) | Active |
| Ode Osbourne | “The Jamaican Sensation” | Flyweight | 13-9-0 (W-L-D) | Active |
| Olaf Alfonso | Welterweight | 8-12-0 (W-L-D) | Inactive | |
| Oleg Taktarov | 17-5-2 (W-L-D) | Inactive | ||
| Oleksandr Doskalchuk | Flyweight | 10-2-0 (W-L-D) | Inactive | |
| Oli Thompson | Heavyweight | 17-10-0 (W-L-D) | Inactive | |
| Oliver Enkamp | “The Future” | Welterweight | 7-2-0 (W-L-D) | Inactive |
| Olivier Aubin-Mercier | “The Canadian Gangster” | Lightweight | 11-5-0 (W-L-D) | Inactive |
| Olivier Murad | Featherweight | 6-0-0 (W-L-D) | Active | |
| Ollie Schmid | “The Hungarian Stallion” | Featherweight | 4-3-0 (W-L-D) | Active |
| Oluwale Bamgbose | “Holy War Angel” | Middleweight | 6-4-0 (W-L-D) | Inactive |
| Omar Morales | “Venezuelan Fighter” | Lightweight | 11-4-0 (W-L-D) | Inactive |
| Omari Akhmedov | “Wolverine” | Middleweight | 21-6-1 (W-L-D) | Inactive |
| Onassis Parungao | 2-1-0 (W-L-D) | Inactive | ||
| Orion Cosce | “Galaxy” | Welterweight | 8-2-0 (W-L-D) | Inactive |
| Orlando Welt | 0-0-0 (W-L-D) | Inactive | ||
| Orlando Wiet | 1-5-0 (W-L-D) | Inactive | ||
| Oron Kahlon | Bantamweight | 16-1-0 (W-L-D) | Active | |
| Oscar Cota | “Elevation” | Heavyweight | 11-3-0 (W-L-D) | Active |
| Oskar Piechota | “Imadlo” | Middleweight | 11-3-1 (W-L-D) | Inactive |
| Otari Tanzilovi | Featherweight | 10-2-0 (W-L-D) | Active | |
| Ottman Azaitar | “Bulldozer” | Lightweight | 13-3-0 (W-L-D) | Active |
| Oumar Sy | Light Heavyweight | 12-2-0 (W-L-D) | Active | |
| Ovince Saint Preux | Light Heavyweight | 27-18-0 (W-L-D) | Inactive | |
| Ozzy Diaz | Middleweight | 10-4-0 (W-L-D) | Active | |
| Pablo Garza | “The Scarecrow” | Featherweight | 12-4-0 (W-L-D) | Inactive |
| Paddy Holohan | “The Hooligan” | Flyweight | 12-2-1 (W-L-D) | Inactive |
| Paddy Pimblett | “The Baddy” | Lightweight | 24-4-0 (W-L-D) | Active |
| Paige VanZant | “12 Gauge” | Women's Flyweight | 8-5-0 (W-L-D) | Inactive |
| Pannie Kianzad | “Banzai” | Women's Bantamweight | 17-9-0 (W-L-D) | Inactive |
| Papy Abedi | “Makambo” | Middleweight | 10-4-0 (W-L-D) | Inactive |
| Parker Porter | Heavyweight | 14-9-0 (W-L-D) | Active | |
| Pascal Krauss | “Panzer” | Welterweight | 11-2-0 (W-L-D) | Inactive |
| Pat Audinwood | “Awesomely Awesome” | Lightweight | 11-2-1 (W-L-D) | Inactive |
| Pat Barry | “HD” | Heavyweight | 8-7-0 (W-L-D) | Inactive |
| Pat Healy | “Bam Bam” | Lightweight | 34-23-0 (W-L-D) | Inactive |
| Pat Miletich | “The Croatian Sensation” | Middleweight | 29-7-2 (W-L-D) | Inactive |
| Pat Sabatini | Featherweight | 22-5-0 (W-L-D) | Active | |
| Pat Schilling | “Thrilling” | Featherweight | 5-2-0 (W-L-D) | Inactive |
| Patchy Mix | “No Love” | Bantamweight | 20-3-0 (W-L-D) | Inactive |
| Patchy Mix | 20-3-0 (W-L-D) | Inactive | ||
| Patricia Alujas | Women's Strawweight | 9-3-0 (W-L-D) | Active | |
| Patricio Pitbull | “Pitbull” | Featherweight | 37-9-0 (W-L-D) | Active |
| Patricio Pitbull | Inactive | |||
| Patrick Cote | “The Predator” | Welterweight | 23-11-0 (W-L-D) | Inactive |
| Patrick Cummins | “Durkin” | Light Heavyweight | 10-7-0 (W-L-D) | Inactive |
| Patrick Smith | Heavyweight | 20-17-0 (W-L-D) | Inactive | |
| Patrick Walsh | Middleweight | 10-3-0 (W-L-D) | Inactive | |
| Patrick Williams | “The Animal” | Bantamweight | 8-6-0 (W-L-D) | Inactive |
| Patrik White | “Prime Time” | Lightweight | 9-2-0 (W-L-D) | Active |
| Paul Bradley | “The Gentleman” | 23-8-0 (W-L-D) | Inactive | |
| Paul Buentello | “The Headhunter” | Heavyweight | 35-17-0 (W-L-D) | Inactive |
| Paul Capaldo | Bantamweight | 6-0-0 (W-L-D) | Inactive | |
| Paul Craig | “BearJew” | Light Heavyweight | 17-10-1 (2 NC) | Inactive |
| Paul Creighton | Lightweight | 3-1-0 (W-L-D) | Inactive | |
| Paul Daley | “Semtex” | Welterweight | 39-15-2 (W-L-D) | Inactive |
| Paul Felder | “The Irish Dragon” | Lightweight | 17-6-0 (W-L-D) | Inactive |
| Paul Georgieff | Welterweight | 6-2-0 (W-L-D) | Inactive | |
| Paul Herrera | 1-1-0 (W-L-D) | Inactive | ||
| Paul Jones | Middleweight | 11-1-1 (W-L-D) | Inactive | |
| Paul Kelly | “Tellys” | Lightweight | 14-5-0 (W-L-D) | Inactive |
| Paul Redmond | “Redser” | Featherweight | 12-7-0 (W-L-D) | Inactive |
| Paul Rodriguez | Lightweight | 10-9-2 (W-L-D) | Inactive | |
| Paul Sass | Lightweight | 14-2-0 (W-L-D) | Inactive | |
| Paul Taylor | “Relentless” | Lightweight | 11-6-1 (W-L-D) | Inactive |
| Paul Varelans | 9-9-0 (W-L-D) | Inactive | ||
| Pauline Macias | Women's Strawweight | 4-1-0 (W-L-D) | Active | |
| Paulo Costa | “The Eraser” | Light Heavyweight | 16-4-0 (W-L-D) | Active |
| Paulo Renato Jr. | Light Heavyweight | 0-2-0 (W-L-D) | Active | |
| Paulo Santos | Lightweight | 0-3-0 (W-L-D) | Inactive | |
| Paulo Thiago | Welterweight | 18-9-0 (W-L-D) | Inactive | |
| Pawan Maan | Lightweight | 7-3-1 (W-L-D) | Inactive | |
| Pawel Pawlak | Welterweight | 12-3-0 (W-L-D) | Inactive | |
| Payton Talbott | Bantamweight | 11-1-0 (W-L-D) | Active | |
| Pearl Gonzalez | Women's Strawweight | 6-3-0 (W-L-D) | Inactive | |
| Pedro Falcao | “Pedrinho” | Bantamweight | 16-5-0 (W-L-D) | Inactive |
| Pedro Munhoz | “The Young Punisher” | Bantamweight | 20-10-0 (1 NC) | Inactive |
| Pedro Nobre | Bantamweight | 18-4-2 (1 NC) | Inactive | |
| Pedro Rizzo | “The Rock” | Heavyweight | 20-11-0 (W-L-D) | Inactive |
| Peggy Morgan | “Daywalker” | Women's Bantamweight | 4-4-0 (W-L-D) | Inactive |
| Per Eklund | Lightweight | 14-5-1 (W-L-D) | Inactive | |
| Pete Rodriguez | “Dead Game” | Welterweight | 5-2-0 (W-L-D) | Active |
| Pete Sell | “Drago” | Welterweight | 10-7-0 (W-L-D) | Inactive |
| Pete Spratt | “The Secret Weapon” | Welterweight | 25-23-0 (W-L-D) | Inactive |
| Pete Williams | “El Duro (The Hard One)” | Heavyweight | 12-6-0 (W-L-D) | Inactive |
| Peter Barrett | “Slippery” | Featherweight | 11-5-0 (W-L-D) | Inactive |
| Peter Danesoe | Flyweight | 8-4-0 (W-L-D) | Active | |
| Peter Petties | “The Joker” | Featherweight | 5-3-0 (W-L-D) | Active |
| Peter Sobotta | Welterweight | 17-7-1 (W-L-D) | Inactive | |
| C Petr Yan | “No Mercy” | Bantamweight | 20-5-0 (W-L-D) | Active |
| Phil Baroni | “New York Bad Ass” | Middleweight | 15-18-0 (W-L-D) | Inactive |
| Phil Caracappa | Bantamweight | 6-1-0 (W-L-D) | Inactive | |
| Phil Davis | “Mr. Wonderful” | Light Heavyweight | 17-4-0 (1 NC) | Inactive |
| Phil De Fries | Heavyweight | 9-3-0 (W-L-D) | Inactive | |
| Phil Harris | “Billy” | Flyweight | 22-12-0 (W-L-D) | Inactive |
| Phil Hawes | “No Hype” | Middleweight | 12-6-0 (W-L-D) | Active |
| Phil Johns | “Little Giant” | Welterweight | 30-14-1 (W-L-D) | Inactive |
| Phil Rowe | “The Fresh Prince” | Welterweight | 11-7-0 (W-L-D) | Inactive |
| Philip De Fries | 12-6-0 (W-L-D) | Inactive | ||
| Philipe Lins | “Monstro” | Light Heavyweight | 18-5-0 (W-L-D) | Active |
| Phillip Miller | Middleweight | 16-0-0 (W-L-D) | Inactive | |
| Phillipe Nover | “The Filipino Assassin” | Featherweight | 11-8-1 (W-L-D) | Inactive |
| Piera Rodriguez | “La Fiera” | Women's Strawweight | 12-2-0 (W-L-D) | Active |
| Pietro Menga | “The Italian Stallion” | Flyweight | 13-0-0 (W-L-D) | Inactive |
| Pingyuan Liu | Bantamweight | 13-7-0 (W-L-D) | Inactive | |
| Piotr Hallmann | Lightweight | 18-6-0 (W-L-D) | Inactive | |
| Poliana Botelho | Women's Flyweight | 8-5-0 (W-L-D) | Inactive | |
| Polyana Viana | “Dama de Ferro” | Women's Strawweight | 13-9-0 (W-L-D) | Active |
| Preston Parsons | “Pressure” | Welterweight | 11-6-0 (W-L-D) | Inactive |
| Priscila Cachoeira | “Zombie Girl” | Women's Bantamweight | 13-9-0 (W-L-D) | Active |
| Przemyslaw Mysiala | Heavyweight | 0-0-0 (W-L-D) | Inactive | |
| Puja Tomar | “Cyclone” | Women's Strawweight | 9-6-0 (W-L-D) | Active |
| Punahele Soriano | “Puna” | Welterweight | 13-4-0 (W-L-D) | Active |
| Qihui Yan | Women's Flyweight | 1-2-0 (W-L-D) | Inactive | |
| Qiu Lun | Flyweight | 16-9-0 (W-L-D) | Inactive | |
| Quang Le | “Bang” | Bantamweight | 9-3-0 (W-L-D) | Inactive |
| Quillan Salkilld | Lightweight | 12-1-0 (W-L-D) | Active | |
| Quinn Mulhern | Lightweight | 18-4-0 (W-L-D) | Inactive | |
| Quinton Jackson | 37-12-0 (W-L-D) | Inactive | ||
| RJ Harris | “The Hammer” | Heavyweight | 6-0-0 (W-L-D) | Active |
| Rachael Ostovich | Women's Flyweight | 4-6-0 (W-L-D) | Inactive | |
| Rafa Garcia | “Gifted” | Lightweight | 19-4-0 (W-L-D) | Active |
| Rafael Alves | “The Turn” | Lightweight | 20-12-0 (W-L-D) | Inactive |
| Rafael Carino | 2-1-1 (W-L-D) | Inactive | ||
| Rafael Cavalcante | “Feijao” | Light Heavyweight | 12-7-0 (W-L-D) | Inactive |
| Rafael Cerqueira | “The Lion” | Light Heavyweight | 11-4-0 (W-L-D) | Inactive |
| Rafael Dos Anjos | Welterweight | 32-17-0 (W-L-D) | Active | |
| Rafael Estevam | “Macapa” | Bantamweight | 14-1-0 (W-L-D) | Active |
| Rafael Fiziev | “Ataman” | Lightweight | 14-5-0 (W-L-D) | Active |
| Rafael Natal | “Sapo” | Middleweight | 21-9-1 (W-L-D) | Inactive |
| Rafael Tobias | “Bipolar” | Light Heavyweight | 14-2-0 (W-L-D) | Active |
| Rafael de Freitas | “Barata (Cockroach)” | Flyweight | 0-0-0 (W-L-D) | Active |
| Rafaello Oliveira | “Tractor” | Lightweight | 17-8-0 (W-L-D) | Inactive |
| Raimond Magomedaliev | Welterweight | 10-2-0 (W-L-D) | Active | |
| Rainn Guerrero | Women's Strawweight | 5-2-0 (W-L-D) | Active | |
| Rainy Martinez | Lightweight | 0-2-0 (W-L-D) | Inactive | |
| Rama Supandhi | Flyweight | 8-4-0 (W-L-D) | Inactive | |
| Ramazan Emeev | “Gorets” | Welterweight | 20-6-0 (W-L-D) | Inactive |
| Ramazan Kuramagomedov | Middleweight | 8-0-0 (W-L-D) | Inactive | |
| Ramazan Temirov | “Temurlan” | Flyweight | 19-3-0 (W-L-D) | Active |
| Rameau Sokoudjou | “The African Assassin” | Light Heavyweight | 5-3-0 (W-L-D) | Inactive |
| Rameau Thierry Sokoudjou | 18-18-0 (W-L-D) | Inactive | ||
| Rami Hamed | Welterweight | 13-3-0 (W-L-D) | Active | |
| Ramiro Hernandez | 19-9-0 (W-L-D) | Inactive | ||
| Ramiro Jimenez | Featherweight | 11-0-0 (W-L-D) | Active | |
| Ramiz Brahimaj | Welterweight | 13-6-0 (W-L-D) | Active | |
| Ramon Taveras | “The Savage” | Featherweight | 10-4-0 (W-L-D) | Active |
| Ramona Pascual | Women's Bantamweight | 6-5-0 (W-L-D) | Inactive | |
| Rampage Jackson | Light Heavyweight | 35-11-0 (W-L-D) | Inactive | |
| Ramsey Nijem | Lightweight | 9-6-0 (W-L-D) | Inactive | |
| Rana Rudra Pratap Singh | Bantamweight | 11-2-0 (W-L-D) | Active | |
| Randa Markos | “Quiet Storm” | Women's Strawweight | 11-12-1 (W-L-D) | Inactive |
| Randall Wallace | “Braveheart” | Middleweight | 15-6-0 (W-L-D) | Inactive |
| Randy Brown | “Rudeboy” | Welterweight | 20-8-0 (W-L-D) | Active |
| Randy Costa | “The Zohan” | Bantamweight | 6-4-0 (W-L-D) | Inactive |
| Randy Couture | “The Natural” | Light Heavyweight | 19-11-0 (W-L-D) | Inactive |
| Rani Yahya | Bantamweight | 28-12-1 (1 NC) | Active | |
| Raoni Barcelos | Bantamweight | 22-5-0 (W-L-D) | Active | |
| Raphael Assunção | Bantamweight | 28-10-0 (W-L-D) | Inactive | |
| Raphael Pessoa | 10-2-0 (W-L-D) | Inactive | ||
| Raphael Pessoa Nunes | “Bebezao” | Heavyweight | 10-2-0 (W-L-D) | Inactive |
| Raquel Pennington | “Rocky” | Women's Bantamweight | 16-10-0 (W-L-D) | Active |
| Rashad Coulter | “Daywalker” | Light Heavyweight | 9-4-0 (W-L-D) | Inactive |
| Rashad Evans | “Suga” | Light Heavyweight | 19-8-1 (W-L-D) | Inactive |
| Rashid Magomedov | “Goretz” | Lightweight | 20-2-0 (W-L-D) | Inactive |
| Raul Rosas Jr. | “El Nino Problema” | Bantamweight | 12-1-0 (W-L-D) | Active |
| Raulian Paiva | Bantamweight | 21-5-0 (W-L-D) | Inactive | |
| Ravena Oliveira | “Kenoudy” | Women's Strawweight | 7-4-1 (W-L-D) | Active |
| Ray Borg | “The Tazmexican Devil” | Bantamweight | 13-5-0 (W-L-D) | Inactive |
| Ray Rodriguez | “The Judge” | Bantamweight | 16-8-0 (W-L-D) | Inactive |
| Ray Wizard | 0-1-0 (W-L-D) | Inactive | ||
| Rayanne Dos Santos | Women's Strawweight | 14-9-0 (W-L-D) | Active | |
| Razak Al-Hassan | “Razor” | Light Heavyweight | 13-5-0 (W-L-D) | Inactive |
| Reese Andy | “Riptide” | Light Heavyweight | 7-3-0 (W-L-D) | Inactive |
| Regina Tarin | 8-0-0 (W-L-D) | Inactive | ||
| Reginaldo Vieira | Bantamweight | 13-5-0 (W-L-D) | Inactive | |
| Rei Tsuruya | Flyweight | 11-1-0 (W-L-D) | Active | |
| Reinier de Ridder | “RdR” | Middleweight | 21-4-0 (W-L-D) | Active |
| Remco Pardoel | 9-6-1 (W-L-D) | Inactive | ||
| Renan Barao | “The Baron” | Bantamweight | 34-9-0 (W-L-D) | Inactive |
| Renato Moicano | Lightweight | 21-7-1 (W-L-D) | Active | |
| Renato Sobral | “Babalu” | Light Heavyweight | 37-11-0 (W-L-D) | Inactive |
| Renato Verissimo | “Charuto” | Welterweight | 7-5-0 (W-L-D) | Inactive |
| Renee Forte | 8-4-0 (W-L-D) | Inactive | ||
| Renzo Gracie | Welterweight | 13-7-1 (W-L-D) | Inactive | |
| Reuben Duran | Bantamweight | 11-7-1 (W-L-D) | Inactive | |
| Rex Holman | “Big Dog” | Light Heavyweight | 4-2-0 (W-L-D) | Inactive |
| Reyes Cortez | Bantamweight | 0-2-0 (W-L-D) | Active | |
| Reza Madadi | “Mad Dog” | Lightweight | 14-6-0 (W-L-D) | Inactive |
| Reza Nasri | 0-1-0 (W-L-D) | Inactive | ||
| Reza Nazri | 0-0-0 (W-L-D) | Inactive | ||
| Rheza Arianto | Featherweight | 0-0-0 (W-L-D) | Active | |
| Rhys McKee | “Skelator” | Welterweight | 14-7-1 (W-L-D) | Inactive |
| Ricardo Abreu | “Demente” | Middleweight | 5-1-0 (W-L-D) | Inactive |
| Ricardo Almeida | “Big Dog” | Welterweight | 13-5-0 (W-L-D) | Inactive |
| Ricardo Funch | “Golden Boy” | Welterweight | 9-6-0 (W-L-D) | Inactive |
| Ricardo Lamas | “The Bully” | Featherweight | 20-8-0 (W-L-D) | Inactive |
| Ricardo Prasel | “Alemao” | Heavyweight | 10-2-0 (W-L-D) | Active |
| Ricardo Ramos | Featherweight | 17-8-0 (W-L-D) | Inactive | |
| Ricardo Romero | Light Heavyweight | 11-3-0 (W-L-D) | Inactive | |
| Ricco Rodriguez | Heavyweight | 53-25-0 (W-L-D) | Inactive | |
| Rich Attonito | “The Raging Bull” | Welterweight | 10-5-0 (W-L-D) | Inactive |
| Rich Clementi | “No Love” | Lightweight | 45-23-1 (W-L-D) | Inactive |
| Rich Franklin | “Ace” | Middleweight | 29-7-0 (W-L-D) | Inactive |
| Rich Walsh | “Filthy” | Welterweight | 9-6-0 (W-L-D) | Inactive |
| Richard Crunkilton | 19-4-0 (W-L-D) | Inactive | ||
| Richard Crunkilton Jr. | “Cleat” | Lightweight | 18-3-0 (W-L-D) | Inactive |
| Richard Jacobi | Heavyweight | 6-1-1 (W-L-D) | Active | |
| Richard Odoms | Heavyweight | 13-3-0 (W-L-D) | Inactive | |
| Richard Walsh | 9-5-0 (W-L-D) | Inactive | ||
| Richardson Moreira | “Rick Monstro” | Middleweight | 7-4-0 (W-L-D) | Inactive |
| Richie Hightower | “The Dirty Samurai” | Welterweight | 8-4-0 (W-L-D) | Inactive |
| Richie Santiago | “The Milford Mauler” | Bantamweight | 7-2-0 (W-L-D) | Inactive |
| Richie Smullen | Lightweight | 3-1-1 (W-L-D) | Inactive | |
| Richie Vaculik | “Vas” | Flyweight | 10-4-0 (W-L-D) | Inactive |
| Rick Davis | “The Flying Squirrel” | Lightweight | 3-1-1 (W-L-D) | Inactive |
| Rick Palacios | “El Gallero” | Featherweight | 10-1-0 (W-L-D) | Active |
| Rick Story | “The Horror” | Welterweight | 19-9-0 (W-L-D) | Inactive |
| Rickson Zenidim | Flyweight | 14-2-0 (W-L-D) | Active | |
| Ricky Calatayud | Flyweight | 16-2-0 (W-L-D) | Active | |
| Ricky Camp | Bantamweight | 11-4-0 (W-L-D) | Inactive | |
| Ricky Glenn | “The Gladiator” | Welterweight | 22-9-2 (W-L-D) | Inactive |
| Ricky Rainey | “The Sniper” | Welterweight | 12-6-0 (W-L-D) | Inactive |
| Ricky Simon | Bantamweight | 22-7-1 (W-L-D) | Active | |
| Ricky Steele | Bantamweight | 6-0-0 (W-L-D) | Active | |
| Ricky Turcios | Bantamweight | 13-6-0 (W-L-D) | Inactive | |
| Rico DiSciullo | Bantamweight | 9-2-0 (W-L-D) | Active | |
| Rico Farrington | Welterweight | 7-3-0 (W-L-D) | Active | |
| Riki Fukuda | Middleweight | 24-9-0 (W-L-D) | Inactive | |
| Riley Dutro | “The Perfect Storm” | Flyweight | 14-4-0 (W-L-D) | Inactive |
| Rin Nakai | Women's Bantamweight | 19-2-1 (W-L-D) | Inactive | |
| Rinat Fakhretdinov | “Gladiator” | Welterweight | 24-1-1 (W-L-D) | Inactive |
| Rinya Nakamura | “Hybred” | Bantamweight | 10-1-0 (W-L-D) | Active |
| Rizvan Kuniev | Heavyweight | 13-3-1 (W-L-D) | Active | |
| Roan Carneiro | “Jucao” | Welterweight | 21-11-0 (W-L-D) | Inactive |
| Rob Broughton | “The Bear” | Heavyweight | 16-7-1 (W-L-D) | Inactive |
| Rob Emerson | Lightweight | 18-12-0 (1 NC) | Inactive | |
| Rob Font | Bantamweight | 22-10-0 (W-L-D) | Active | |
| Rob Kimmons | “The Rosedale Reaper” | Middleweight | 25-9-0 (W-L-D) | Inactive |
| Rob MacDonald | “Maximus” | Light Heavyweight | 5-4-0 (W-L-D) | Inactive |
| Rob Whiteford | “The Hammer” | Featherweight | 12-4-0 (W-L-D) | Inactive |
| Rob Wilkinson | “Razor” | Middleweight | 11-2-0 (W-L-D) | Inactive |
| Rob Yundt | “Monster” | Middleweight | 9-5-0 (W-L-D) | Inactive |
| Robbie Lawler | “Ruthless” | Welterweight | 30-16-0 (W-L-D) | Inactive |
| Robbie Peralta | “Problems” | Featherweight | 18-6-0 (W-L-D) | Inactive |
| Robbie Ring | Featherweight | 6-1-0 (W-L-D) | Active | |
| Robelis Despaigne | “The Big Boy” | Heavyweight | 5-2-0 (W-L-D) | Inactive |
| Robert Bryczek | Middleweight | 18-7-0 (W-L-D) | Active | |
| Robert Drysdale | Light Heavyweight | 7-0-0 (W-L-D) | Inactive | |
| Robert Lucarelli | 0-1-0 (W-L-D) | Inactive | ||
| Robert Mcdaniel | 28-10-0 (W-L-D) | Inactive | ||
| Robert Peralta | 18-8-0 (W-L-D) | Inactive | ||
| Robert Ruchala | “Faker” | Featherweight | 11-3-0 (W-L-D) | Active |
| Robert Sanchez | 8-2-0 (W-L-D) | Inactive | ||
| Robert Valentin | “Robzilla” | Middleweight | 12-6-0 (W-L-D) | Active |
| Robert Valentin | 12-6-0 (W-L-D) | Inactive | ||
| Robert Whiteford | 14-4-0 (W-L-D) | Inactive | ||
| Robert Whittaker | “The Reaper” | Light Heavyweight | 28-9-0 (W-L-D) | Active |
| Roberto Romero | “El Charro Negro” | Featherweight | 8-5-1 (W-L-D) | Active |
| Roberto Sanchez | “Littlefury” | Flyweight | 8-2-0 (W-L-D) | Inactive |
| Roberto Traven | Heavyweight | 6-4-1 (W-L-D) | Inactive | |
| Rocky Lee | Featherweight | 3-2-0 (W-L-D) | Inactive | |
| Rodney Wallace | “Shonuff The Master” | Light Heavyweight | 26-15-1 (W-L-D) | Inactive |
| Rodolfo Bellato | “Trator” | Light Heavyweight | 13-3-1 (2 NC) | Active |
| Rodolfo Rubio | “Fito” | Featherweight | 12-8-0 (W-L-D) | Inactive |
| Rodolfo Rubio Perez | 10-16-1 (W-L-D) | Inactive | ||
| Rodolfo Vieira | Middleweight | 11-5-0 (W-L-D) | Active | |
| Rodrigo Damm | Lightweight | 13-9-0 (W-L-D) | Inactive | |
| Rodrigo Lidio | Lightweight | 12-3-0 (W-L-D) | Active | |
| Rodrigo Nascimento | “Ze' Colmeia” | Heavyweight | 11-3-0 (W-L-D) | Inactive |
| Rodrigo Ruas | Middleweight | 4-5-1 (W-L-D) | Inactive | |
| Rodrigo Sezinando | Welterweight | 9-2-0 (W-L-D) | Active | |
| Rodrigo Vera | “El Gato Loco” | Featherweight | 22-1-1 (W-L-D) | Active |
| Rodrigo de Lima | Lightweight | 8-3-1 (W-L-D) | Inactive | |
| Roger Bowling | “Relentless” | Lightweight | 12-6-0 (1 NC) | Inactive |
| Roger Gracie | Middleweight | 8-2-0 (W-L-D) | Inactive | |
| Roger Hollett | “The Hulk” | Light Heavyweight | 13-5-0 (W-L-D) | Inactive |
| Roger Huerta | “El Matador” | Lightweight | 23-9-1 (W-L-D) | Inactive |
| Roger Narvaez | “Silverback” | Middleweight | 8-3-0 (W-L-D) | Inactive |
| Roger Zapata | “Viva” | Welterweight | 4-2-0 (W-L-D) | Inactive |
| Rogerio Bontorin | Flyweight | 16-4-0 (W-L-D) | Inactive | |
| Rogerio Nogueira | 23-10-0 (W-L-D) | Inactive | ||
| Roland Delorme | Bantamweight | 9-5-0 (W-L-D) | Inactive | |
| Roland Payne | 0-1-0 (W-L-D) | Inactive | ||
| Rolando Bedoya | “The Machine” | Lightweight | 14-5-0 (W-L-D) | Inactive |
| Rolando Delgado | “The Crazy Cuban” | Lightweight | 11-6-1 (W-L-D) | Inactive |
| Rolando Dy | “Dy Incredible” | Featherweight | 9-7-1 (W-L-D) | Inactive |
| Roldan Sangcha-an | “The Executioner” | Flyweight | 4-2-0 (W-L-D) | Inactive |
| Roldan Sangchaan | 4-2-0 (W-L-D) | Inactive | ||
| Rolles Gracie | Heavyweight | 8-4-0 (W-L-D) | Inactive | |
| Roman Bogatov | Lightweight | 10-1-0 (W-L-D) | Inactive | |
| Roman Dolidze | Middleweight | 15-5-0 (W-L-D) | Active | |
| Roman Kopylov | Middleweight | 15-5-0 (W-L-D) | Active | |
| Roman Mitichyan | “The Emperor” | Welterweight | 8-3-0 (W-L-D) | Inactive |
| Roman Salazar | “El Gallito” | Bantamweight | 10-6-0 (1 NC) | Inactive |
| Romie Aram | Welterweight | 7-1-0 (W-L-D) | Inactive | |
| Ron Faircloth | Light Heavyweight | 33-20-0 (1 NC) | Inactive | |
| Ron Stallings | “ChoirBoy” | Middleweight | 14-8-0 (W-L-D) | Inactive |
| Ron Van Clief | 0-1-0 (W-L-D) | Inactive | ||
| Ron Waterman | Heavyweight | 16-6-2 (W-L-D) | Inactive | |
| Ronal Siahaan | Flyweight | 7-1-0 (W-L-D) | Active | |
| Ronald Jhun | “The Machine Gun” | Welterweight | 24-26-2 (W-L-D) | Inactive |
| Ronaldo Candido | “Pacman” | Flyweight | 6-0-0 (W-L-D) | Inactive |
| Ronaldo Rodriguez | “Lazy Boy” | Flyweight | 17-3-0 (W-L-D) | Active |
| Ronaldo Rodriguez | 17-3-0 (W-L-D) | Inactive | ||
| Ronaldo Souza | “Jacare” | Middleweight | 26-10-0 (W-L-D) | Inactive |
| Ronda Rousey | “Rowdy” | Women's Bantamweight | 12-2-0 (W-L-D) | Inactive |
| Rongzhu | Lightweight | 28-6-0 (W-L-D) | Active | |
| Ronnie Lawrence | “The Heat” | Bantamweight | 8-2-0 (W-L-D) | Active |
| Ronny Markes | Middleweight | 17-5-0 (W-L-D) | Inactive | |
| Rony Jason | “Jason” | Featherweight | 14-7-0 (W-L-D) | Inactive |
| Ronys Torres | “Jungle Boy” | Lightweight | 35-5-0 (W-L-D) | Inactive |
| Roosevelt Roberts | “The Predator” | Lightweight | 12-6-0 (W-L-D) | Inactive |
| Roque Martinez | Heavyweight | 15-8-2 (W-L-D) | Inactive | |
| Rory MacDonald | “Red King” | Welterweight | 19-4-0 (W-L-D) | Inactive |
| Rory Markham | Welterweight | 17-6-0 (W-L-D) | Inactive | |
| Rory Singer | “Outburst” | Middleweight | 11-9-0 (W-L-D) | Inactive |
| Rose Namajunas | “Thug” | Women's Flyweight | 15-8-0 (W-L-D) | Active |
| Roshan Mainam | Featherweight | 6-3-0 (W-L-D) | Inactive | |
| Rosi Sexton | “The Surgeon” | Women's Bantamweight | 13-5-0 (W-L-D) | Inactive |
| Ross Pearson | “The Real Deal” | Lightweight | 20-16-0 (1 NC) | Inactive |
| Ross Pointon | “The Gladiator” | Welterweight | 6-17-0 (W-L-D) | Inactive |
| Rostem Akman | Welterweight | 6-2-0 (W-L-D) | Inactive | |
| Rousimar Palhares | “Toquinho” | Welterweight | 19-8-0 (W-L-D) | Inactive |
| Roxanne Modafferi | “The Happy Warrior” | Women's Flyweight | 25-21-0 (W-L-D) | Inactive |
| Roy Nelson | “Big Country” | Heavyweight | 22-14-0 (W-L-D) | Inactive |
| Roybert Echeverria | “The Unbroken” | Flyweight | 7-1-0 (W-L-D) | Active |
| Royce Alger | Middleweight | 3-2-0 (W-L-D) | Inactive | |
| Royce Gracie | Middleweight | 15-2-3 (W-L-D) | Inactive | |
| Royston Wee | Bantamweight | 4-1-0 (W-L-D) | Inactive | |
| Ruan Potts | “Fangzz” | Heavyweight | 11-6-0 (W-L-D) | Inactive |
| Rudyard Moncayo | 0-3-0 (W-L-D) | Inactive | ||
| Ruslan Magomedov | “Leopard” | Heavyweight | 14-1-0 (W-L-D) | Inactive |
| Russell Doane | Bantamweight | 15-8-0 (W-L-D) | Inactive | |
| Rustam Khabilov | “Tiger” | Welterweight | 24-4-0 (W-L-D) | Inactive |
| Ryan Bader | “Darth” | Light Heavyweight | 23-5-0 (W-L-D) | Inactive |
| Ryan Benoit | “Baby Face” | Flyweight | 10-8-0 (W-L-D) | Inactive |
| Ryan Couture | Lightweight | 11-5-0 (W-L-D) | Inactive | |
| Ryan Gandra | “Problema” | Middleweight | 10-1-0 (W-L-D) | Active |
| Ryan Hall | “The Wizard” | Featherweight | 9-2-0 (W-L-D) | Active |
| Ryan Janes | Middleweight | 10-3-0 (W-L-D) | Inactive | |
| Ryan Jensen | Middleweight | 21-8-0 (W-L-D) | Inactive | |
| Ryan Jimmo | “The Big Deal” | Light Heavyweight | 19-5-0 (W-L-D) | Inactive |
| Ryan LaFlare | Welterweight | 14-3-0 (W-L-D) | Inactive | |
| Ryan Loder | “Man of Steel” | Middleweight | 8-3-0 (W-L-D) | Active |
| Ryan MacDonald | “Main Event” | Bantamweight | 10-2-0 (W-L-D) | Inactive |
| Ryan Madigan | “The Lion” | Welterweight | 5-3-0 (W-L-D) | Inactive |
| Ryan McGilivray | “The Kid” | Welterweight | 11-5-1 (W-L-D) | Inactive |
| Ryan Mcgillivray | 12-0-1 (W-L-D) | Inactive | ||
| Ryan Parker | 0-1-0 (W-L-D) | Inactive | ||
| Ryan Roberts | “Are you Ready?” | Lightweight | 21-12-1 (W-L-D) | Inactive |
| Ryan Spann | “Superman” | Heavyweight | 24-11-0 (W-L-D) | Active |
| Ryan Thomas | “The Tank Engine” | Welterweight | 20-8-0 (W-L-D) | Inactive |
| Ryo Chonan | “Piranha” | Welterweight | 22-13-0 (W-L-D) | Inactive |
| Sabah Homasi | “The Problem” | Welterweight | 11-8-0 (W-L-D) | Inactive |
| Sabina Mazo | “Colombian Queen” | Women's Flyweight | 9-4-0 (W-L-D) | Inactive |
| Saeed Hosseini | Lightweight | 0-1-0 (W-L-D) | Inactive | |
| Sage Northcutt | “Super” | Welterweight | 11-2-0 (W-L-D) | Inactive |
| Sai Wang | 20-6-1 (W-L-D) | Inactive | ||
| Said Nurmagomedov | Bantamweight | 18-5-0 (W-L-D) | Active | |
| Saidyokub Kakhramonov | Bantamweight | 10-3-0 (W-L-D) | Inactive | |
| Saimon Oliveira | Bantamweight | 18-7-0 (W-L-D) | Active | |
| Sako Chivitchian | “The Psycho” | Lightweight | 8-1-0 (W-L-D) | Inactive |
| Salim Touahri | “Grizzly” | Welterweight | 10-4-0 (W-L-D) | Inactive |
| Sam Adkins | Light Heavyweight | 7-20-2 (W-L-D) | Inactive | |
| Sam Alvey | “Smile'N” | Middleweight | 33-18-1 (W-L-D) | Inactive |
| Sam Fulton | Heavyweight | 0-2-0 (W-L-D) | Inactive | |
| Sam Hoger | “The Alaskan Assassin” | Light Heavyweight | 10-4-0 (W-L-D) | Inactive |
| Sam Hughes | “Sampage” | Women's Strawweight | 11-7-0 (W-L-D) | Active |
| Sam Patterson | Welterweight | 14-3-1 (W-L-D) | Active | |
| Sam Sicilia | Featherweight | 15-8-0 (W-L-D) | Inactive | |
| Sam Stout | “Hands of Stone” | Lightweight | 20-12-1 (W-L-D) | Inactive |
| Samandar Murodov | Welterweight | 11-0-0 (W-L-D) | Inactive | |
| Sammy Morgan | “The Squeeze” | Welterweight | 18-12-0 (W-L-D) | Inactive |
| Samuel Sanches | Lightweight | 11-1-0 (W-L-D) | Active | |
| Samy Schiavo | “The Dog” | Lightweight | 10-6-0 (W-L-D) | Inactive |
| Sanae Kikuta | 31-9-3 (W-L-D) | Inactive | ||
| Sandra Lavado | Women's Strawweight | 10-3-0 (W-L-D) | Active | |
| Sang Hoon Yoo | Welterweight | 1-0-0 (W-L-D) | Active | |
| Sang Won Kim | Featherweight | 1-1-0 (W-L-D) | Active | |
| SangWook Kim | “Frogman” | 13-4-0 (W-L-D) | Inactive | |
| Santiago Luna | “BorderBoy” | Bantamweight | 8-1-0 (W-L-D) | Active |
| Santiago Ponzinibbio | “Argentine Dagger” | Welterweight | 31-9-0 (W-L-D) | Active |
| Santo Curatolo | Flyweight | 6-2-0 (W-L-D) | Inactive | |
| Saparbeg Safarov | Middleweight | 9-3-0 (W-L-D) | Inactive | |
| Sara McMann | Women's Bantamweight | 13-6-0 (W-L-D) | Inactive | |
| Sarah Alpar | “Too Sweet” | Women's Flyweight | 9-6-0 (W-L-D) | Inactive |
| Sarah Frota | “A Treta” | Women's Flyweight | 9-2-0 (W-L-D) | Inactive |
| Sarah Kaufman | Women's Bantamweight | 18-4-0 (W-L-D) | Inactive | |
| Sarah Moras | “Cheesecake” | Women's Bantamweight | 6-8-0 (W-L-D) | Inactive |
| Sasha Palatnikov | Welterweight | 6-4-0 (W-L-D) | Inactive | |
| Satoshi Honma | Heavyweight | 4-6-3 (W-L-D) | Inactive | |
| Saul Rogers | Lightweight | 0-0-0 (W-L-D) | Inactive | |
| Saygid Izagakhmaev | Welterweight | 22-3-0 (W-L-D) | Active | |
| Scott Adams | Heavyweight | 8-1-0 (W-L-D) | Inactive | |
| Scott Askham | Middleweight | 14-4-0 (W-L-D) | Inactive | |
| Scott Baker | 1-1-0 (W-L-D) | Inactive | ||
| Scott Bessac | 4-6-0 (W-L-D) | Inactive | ||
| Scott Ferrozzo | Heavyweight | 4-2-0 (W-L-D) | Inactive | |
| Scott Fiedler | 0-1-0 (W-L-D) | Inactive | ||
| Scott Fielder | 0-0-0 (W-L-D) | Inactive | ||
| Scott Holtzman | “Hot Sauce” | Lightweight | 14-6-0 (W-L-D) | Inactive |
| Scott Jorgensen | “Young Guns” | Bantamweight | 15-12-0 (W-L-D) | Inactive |
| Scott Junk | Heavyweight | 8-3-1 (W-L-D) | Inactive | |
| Scott McAfee | “The Alaskan Hammer” | Lightweight | 14-7-0 (W-L-D) | Inactive |
| Scott Morris | 2-1-0 (W-L-D) | Inactive | ||
| Scott Smith | “Hands of Steel” | Middleweight | 18-11-0 (W-L-D) | Inactive |
| Sean Alvarez | Heavyweight | 4-3-0 (W-L-D) | Inactive | |
| Sean Brady | Welterweight | 19-2-0 (W-L-D) | Active | |
| Sean Daugherty | 0-2-0 (W-L-D) | Inactive | ||
| Sean Daughtery | 0-0-0 (W-L-D) | Inactive | ||
| Sean Gannon | “The Cannon” | Heavyweight | 2-1-0 (W-L-D) | Inactive |
| Sean Lally | “The Unpredictable One” | Welterweight | 7-3-0 (W-L-D) | Active |
| Sean Loeffler | “The Destroyer” | Middleweight | 31-5-0 (W-L-D) | Inactive |
| Sean McCorkle | “Big Sexy” | Heavyweight | 17-7-0 (W-L-D) | Inactive |
| Sean Mcinerney | “Poopies” | Welterweight | 0-0-0 (W-L-D) | Active |
| Sean O'Connell | “The Real OC” | Light Heavyweight | 17-9-0 (W-L-D) | Inactive |
| Sean O'Malley | “Suga” | Bantamweight | 20-3-0 (W-L-D) | Active |
| Sean Pierson | “The Punisher” | Welterweight | 14-6-0 (W-L-D) | Inactive |
| Sean Salmon | Light Heavyweight | 18-21-0 (W-L-D) | Inactive | |
| Sean Santella | “Shorty Rock” | Flyweight | 17-6-1 (W-L-D) | Inactive |
| Sean Sharaf | “The Smoke” | Heavyweight | 4-2-0 (W-L-D) | Active |
| Sean Sherk | “Muscle Shark” | Lightweight | 36-4-1 (W-L-D) | Inactive |
| Sean Soriano | Featherweight | 14-8-0 (W-L-D) | Inactive | |
| Sean Spencer | Welterweight | 12-6-0 (W-L-D) | Inactive | |
| C Sean Strickland | Middleweight | 31-7-0 (W-L-D) | Active | |
| Sean Woodson | “The Sniper” | Featherweight | 13-2-1 (W-L-D) | Active |
| Sebastian Szalay | “Seb” | 10-2-0 (W-L-D) | Inactive | |
| Sedriques Dumas | “The Reaper” | Middleweight | 10-5-0 (2 NC) | Inactive |
| Semmy Schilt | “The Viking” | Heavyweight | 26-14-1 (W-L-D) | Inactive |
| Seo Hee Ham | 17-8-0 (W-L-D) | Inactive | ||
| Seohee Ham | Women's Strawweight | 16-8-0 (W-L-D) | Inactive | |
| Seokhyeon Ko | “The Korean Tyson” | Welterweight | 13-3-0 (W-L-D) | Active |
| SeongChan Hong | Lightweight | 9-2-0 (W-L-D) | Active | |
| Sergei Pavlovich | Heavyweight | 21-3-0 (W-L-D) | Active | |
| Sergey Khandozhko | “Honda” | Welterweight | 28-6-1 (W-L-D) | Inactive |
| Sergey Morozov | Bantamweight | 19-5-0 (W-L-D) | Active | |
| Serghei Spivac | “Polar Bear” | Heavyweight | 18-6-0 (W-L-D) | Active |
| Sergio Moraes | “The Panther” | Welterweight | 14-6-1 (W-L-D) | Inactive |
| Sergio Pettis | Bantamweight | 18-5-0 (W-L-D) | Inactive | |
| Serhiy Sidey | Bantamweight | 12-2-0 (W-L-D) | Active | |
| Seth Baczynski | “Polish Pistola” | Welterweight | 20-14-0 (W-L-D) | Inactive |
| Seth Petruzelli | “The Silverback” | Light Heavyweight | 14-8-0 (W-L-D) | Inactive |
| SeungGuk Choi | Flyweight | 7-3-0 (W-L-D) | Active | |
| Seungwoo Choi | “Sting” | Featherweight | 11-8-0 (W-L-D) | Inactive |
| Shaheen Santana | Lightweight | 6-1-0 (W-L-D) | Active | |
| Shamar Bailey | Lightweight | 16-11-0 (W-L-D) | Inactive | |
| Shamil Abdurakhimov | “Abrek” | Heavyweight | 20-8-0 (W-L-D) | Inactive |
| Shamil Gamzatov | Light Heavyweight | 14-1-0 (W-L-D) | Inactive | |
| Shamil Gaziev | Heavyweight | 14-3-0 (W-L-D) | Active | |
| Shana Dobson | “Danger” | Women's Flyweight | 4-5-0 (W-L-D) | Inactive |
| Shane Burgos | “Hurricane” | Featherweight | 15-3-0 (W-L-D) | Inactive |
| Shane Campbell | “Shaolin” | Lightweight | 14-6-0 (W-L-D) | Inactive |
| Shane Carwin | Heavyweight | 12-2-0 (W-L-D) | Inactive | |
| Shane Collins | “Hollywood” | Featherweight | 8-0-0 (W-L-D) | Active |
| Shane Del Rosario | Heavyweight | 11-2-0 (W-L-D) | Inactive | |
| Shane Howell | Flyweight | 13-10-0 (W-L-D) | Inactive | |
| Shane Nelson | “Sugar” | Lightweight | 16-7-0 (W-L-D) | Inactive |
| Shane Primm | Light Heavyweight | 5-5-0 (W-L-D) | Inactive | |
| Shane Roller | Lightweight | 11-7-0 (W-L-D) | Inactive | |
| Shane Young | “Maraenui” | Featherweight | 13-8-0 (W-L-D) | Active |
| Shanelle Dyer | “The Nightmare” | Women's Strawweight | 7-1-0 (W-L-D) | Active |
| Shang Zhifa | Flyweight | 32-8-0 (W-L-D) | Inactive | |
| Shanna Young | “The Shanimal” | Women's Flyweight | 9-6-0 (W-L-D) | Inactive |
| Shannon Gugerty | Lightweight | 15-7-0 (W-L-D) | Inactive | |
| Shannon Ross | “The Turkish Delight” | Flyweight | 13-9-0 (W-L-D) | Active |
| Shara Magomedov | “Bullet” | Middleweight | 17-1-0 (W-L-D) | Active |
| Shaun Etchell | Flyweight | 7-3-0 (W-L-D) | Inactive | |
| Shauna Bannon | “Mama B” | Women's Strawweight | 7-3-0 (W-L-D) | Active |
| Shavkat Rakhmonov | “Nomad” | Welterweight | 19-0-0 (W-L-D) | Active |
| Shawn Jordan | “The Savage” | Heavyweight | 19-8-0 (W-L-D) | Inactive |
| Shawn Teed | Heavyweight | 5-2-0 (W-L-D) | Inactive | |
| Shayilan Nuerdanbieke | “Wolverine” | Featherweight | 39-12-0 (W-L-D) | Inactive |
| Shayna Baszler | “The Queen of Spades” | Women's Bantamweight | 15-11-0 (W-L-D) | Inactive |
| Sheila Gaff | “The German Tank” | Women's Bantamweight | 9-7-0 (W-L-D) | Inactive |
| Sheldon Westcott | Welterweight | 10-3-1 (W-L-D) | Active | |
| Shelton Graves | “The Gravedigger” | Heavyweight | 7-3-0 (W-L-D) | Inactive |
| Shem Rock | Lightweight | 12-3-1 (W-L-D) | Inactive | |
| Sherman Pendergarst | “The Tank” | Heavyweight | 11-18-0 (W-L-D) | Inactive |
| Sherrard Blackledge | Lightweight | 5-1-0 (W-L-D) | Active | |
| Sheymon Moraes | Featherweight | 11-4-0 (W-L-D) | Inactive | |
| Shi Ming | Women's Strawweight | 18-6-0 (W-L-D) | Active | |
| Shimon Smotritsky | “The Assassin” | Welterweight | 8-2-0 (W-L-D) | Inactive |
| Shin Haraguchi | Lightweight | 8-2-0 (W-L-D) | Active | |
| Shinsho Anzai | “Animal” | Welterweight | 10-3-0 (W-L-D) | Inactive |
| Sho Patrick Usami | Lightweight | 4-1-0 (W-L-D) | Inactive | |
| Shohei Nose | Bantamweight | 12-5-2 (W-L-D) | Inactive | |
| Shonie Carter | “Mr. International” | Welterweight | 51-31-7 (W-L-D) | Inactive |
| Shonte Barnes | “Shyne” | Middleweight | 6-2-1 (W-L-D) | Active |
| Shunichi Shimizu | “RollingStar” | Bantamweight | 30-18-11 (W-L-D) | Inactive |
| Shuya Kamikubo | Bantamweight | 13-2-1 (W-L-D) | Active | |
| Sidney Outlaw | Welterweight | 8-4-0 (W-L-D) | Active | |
| Sijara Eubanks | “SarJ” | Women's Flyweight | 8-7-0 (W-L-D) | Inactive |
| Silvana Gomez Juarez | “La Malvada” | Women's Strawweight | 7-5-0 (W-L-D) | Inactive |
| Silvana Gomez Juarez | 11-5-0 (W-L-D) | Inactive | ||
| Sim Kai Xiong | Flyweight | 7-2-0 (W-L-D) | Active | |
| Simeon Thoresen | “The Grin” | Welterweight | 17-6-1 (W-L-D) | Inactive |
| Simon Biyong | Light Heavyweight | 7-1-0 (W-L-D) | Active | |
| Sinae Kikuta | Middleweight | 0-0-0 (W-L-D) | Inactive | |
| Sione Latu | Heavyweight | 1-0-0 (W-L-D) | Inactive | |
| Sirwan Kakai | “Zohan” | Bantamweight | 12-5-0 (W-L-D) | Inactive |
| Siyar Bahadurzada | “The Great” | Welterweight | 24-8-1 (W-L-D) | Inactive |
| Slim Trabelsi | Heavyweight | 5-0-0 (W-L-D) | Inactive | |
| So Yul Kim | Women's Strawweight | 8-1-0 (W-L-D) | Inactive | |
| Soa Palelei | “The Hulk” | Heavyweight | 22-5-0 (W-L-D) | Inactive |
| Sodiq Yusuff | “Super” | Lightweight | 13-5-0 (W-L-D) | Active |
| Sofia Montenegro | “La Bruja” | Flyweight | 6-2-0 (W-L-D) | Active |
| Solomon Hutcherson | “King” | Middleweight | 11-7-0 (W-L-D) | Inactive |
| Solomon Renfro | “The Black Dragon/King” | Welterweight | 8-2-0 (W-L-D) | Active |
| Song Kenan | “The Assassin” | Welterweight | 22-9-0 (W-L-D) | Active |
| Song Yadong | “Kung Fu Kid” | Bantamweight | 23-9-1 (W-L-D) | Active |
| Sovannahry Em | Women's Bantamweight | 3-1-0 (W-L-D) | Active | |
| Spencer Fisher | “The King” | Lightweight | 24-9-0 (W-L-D) | Inactive |
| Spike Carlyle | “The Alpha Ginger” | Featherweight | 9-3-0 (W-L-D) | Inactive |
| Stanislav Nedkov | “Stucky” | Light Heavyweight | 12-2-0 (W-L-D) | Inactive |
| Stefan Sekulic | Welterweight | 12-4-0 (W-L-D) | Inactive | |
| Stefan Struve | “Skyscraper” | Heavyweight | 33-13-0 (W-L-D) | Inactive |
| Stephan Bonnar | “American Psycho” | Light Heavyweight | 15-9-0 (W-L-D) | Inactive |
| Stephanie Egger | Women's Bantamweight | 8-5-0 (W-L-D) | Inactive | |
| Stephanie Frausto | Women's Strawweight | 8-7-0 (W-L-D) | Active | |
| Stephanie Luciano | “Rondinha” | Women's Strawweight | 7-2-1 (W-L-D) | Active |
| Stephanie Luciano | 7-2-1 (W-L-D) | Inactive | ||
| Stephen Bass | “Bigfish” | Featherweight | 11-2-0 (W-L-D) | Inactive |
| Stephen Thompson | “Wonderboy” | Welterweight | 17-9-1 (W-L-D) | Active |
| Steve Berger | “Red Nose” | Welterweight | 21-23-2 (W-L-D) | Inactive |
| Steve Bosse | “The Boss” | Light Heavyweight | 12-2-0 (W-L-D) | Inactive |
| Steve Bruno | “Hollywood” | Welterweight | 15-6-0 (W-L-D) | Inactive |
| Steve Byrnes | “The Sergeant” | Middleweight | 6-1-0 (W-L-D) | Inactive |
| Steve Cantwell | “Robot” | Middleweight | 7-6-0 (W-L-D) | Inactive |
| Steve Erceg | “Astroboy” | Flyweight | 14-4-0 (W-L-D) | Active |
| Steve Garcia | “Mean Machine” | Featherweight | 19-6-0 (W-L-D) | Active |
| Steve Jennum | 2-3-0 (W-L-D) | Inactive | ||
| Steve Judson | Heavyweight | 0-2-0 (W-L-D) | Inactive | |
| Steve Kennedy | 24-8-0 (W-L-D) | Inactive | ||
| Steve Lopez | Lightweight | 13-6-1 (W-L-D) | Inactive | |
| Steve Montgomery | “The Creepy Weasel” | Middleweight | 9-5-0 (W-L-D) | Inactive |
| Steve Nelmark | 2-1-0 (W-L-D) | Inactive | ||
| Steve Regman | “The Predator” | Middleweight | 9-3-0 (W-L-D) | Active |
| Steve Steinbeiss | “The Hooligan” | Middleweight | 9-4-0 (W-L-D) | Inactive |
| Steve Vigneault | “Lion Heart” | Middleweight | 12-6-0 (W-L-D) | Inactive |
| Steven Asplund | “Concrete” | Heavyweight | 7-2-0 (W-L-D) | Active |
| Steven Graham | 2-1-0 (W-L-D) | Inactive | ||
| Steven Kennedy | “The Steamrolla” | Welterweight | 22-8-0 (W-L-D) | Inactive |
| Steven Koslow | “Obi Won Shinobi The Pillow” | Bantamweight | 6-1-0 (W-L-D) | Active |
| Steven Nguyen | “The Ninja” | Featherweight | 10-2-0 (W-L-D) | Active |
| Steven Peterson | “Ocho” | Featherweight | 19-11-0 (W-L-D) | Inactive |
| Steven Siler | “Super” | Featherweight | 29-16-0 (W-L-D) | Inactive |
| Stevie Lynch | “Smiling Assassin” | Welterweight | 5-2-0 (W-L-D) | Inactive |
| Stevie Ray | “Braveheart” | Lightweight | 23-9-0 (W-L-D) | Inactive |
| Stewart Nicoll | “Kakamora” | Flyweight | 8-4-0 (W-L-D) | Active |
| Stipe Miocic | Heavyweight | 20-5-0 (W-L-D) | Inactive | |
| SuYoung You | “You-Jitsu” | Bantamweight | 16-4-0 (W-L-D) | Active |
| SuYoung You | 16-4-0 (W-L-D) | Inactive | ||
| Sulangrangbo | 10-4-0 (W-L-D) | Inactive | ||
| Sulangrangbo | 10-3-0 (W-L-D) | Inactive | ||
| Sultan Aliev | Welterweight | 15-3-0 (W-L-D) | Inactive | |
| Suman Mokhtarian | Featherweight | 8-5-0 (W-L-D) | Inactive | |
| Sumit Kumar | Flyweight | 8-1-0 (W-L-D) | Active | |
| Sumudaerji | “The Tibetan Eagle” | Flyweight | 19-7-0 (W-L-D) | Active |
| Sung Bin Jo | “Korean Falcon” | Featherweight | 9-1-0 (W-L-D) | Inactive |
| Syuri Kondo | Women's Strawweight | 6-3-0 (W-L-D) | Inactive | |
| TBD TBD | Women's Strawweight | 0-0-0 (W-L-D) | Inactive | |
| TJ Brown | “Downtown” | Featherweight | 17-11-0 (W-L-D) | Inactive |
| TJ Dillashaw | Bantamweight | 18-5-0 (W-L-D) | Inactive | |
| TJ Grant | Lightweight | 21-5-0 (W-L-D) | Inactive | |
| TJ Laramie | Featherweight | 12-5-0 (W-L-D) | Inactive | |
| TJ O'Brien | “The Spider” | Lightweight | 20-8-0 (W-L-D) | Inactive |
| TJ Waldburger | “The Modern Day Warrior” | Welterweight | 16-9-0 (W-L-D) | Inactive |
| Tabatha Ricci | “Baby Shark” | Women's Strawweight | 12-5-0 (W-L-D) | Active |
| Tae Hyun Bang | “The Korean Cowboy” | Lightweight | 18-10-0 (W-L-D) | Inactive |
| Tafon Nchukwi | “Da Don” | Middleweight | 6-4-0 (W-L-D) | Inactive |
| Tagir Ulanbekov | Flyweight | 17-3-0 (W-L-D) | Active | |
| Tahir Abdullayev | “Tank” | Welterweight | 20-3-0 (W-L-D) | Active |
| Tai Bowden | 1-1-0 (W-L-D) | Inactive | ||
| Tai Tuivasa | “Bam Bam” | Heavyweight | 15-10-0 (W-L-D) | Inactive |
| Taila Santos | Women's Flyweight | 19-3-0 (W-L-D) | Active | |
| Tainara Lisboa | “Thai Panther” | Women's Bantamweight | 7-4-0 (W-L-D) | Active |
| Takanori Gomi | “The Fireball Kid” | Lightweight | 35-14-0 (W-L-D) | Inactive |
| Takashi Sato | “Ten” | Welterweight | 16-7-0 (W-L-D) | Inactive |
| Takenori Sato | Welterweight | 19-11-7 (W-L-D) | Inactive | |
| Takeru Uchida | Flyweight | 9-2-0 (W-L-D) | Inactive | |
| Takeya Mizugaki | Bantamweight | 21-11-2 (W-L-D) | Inactive | |
| Talita Alencar | “Problem Child” | Women's Strawweight | 8-1-1 (W-L-D) | Active |
| Talita Bernardo | Women's Bantamweight | 6-4-0 (W-L-D) | Inactive | |
| Tallison Teixeira | “Xicao” | Heavyweight | 9-2-0 (W-L-D) | Active |
| Tamdan McCrory | “The Barn Cat” | Middleweight | 14-5-0 (W-L-D) | Inactive |
| Tamires Vidal | “Tractor” | Women's Bantamweight | 7-4-0 (W-L-D) | Inactive |
| Taneisha Tennant | Featherweight | 5-1-0 (W-L-D) | Active | |
| Tank Abbott | “Tank” | Heavyweight | 8-10-0 (W-L-D) | Inactive |
| Tanner Boser | “The Bulldozer” | Heavyweight | 22-11-1 (W-L-D) | Active |
| Tarec Saffiedine | “Sponge” | Welterweight | 16-7-0 (W-L-D) | Inactive |
| Tateki Matsuda | “Tech” | Flyweight | 13-8-0 (W-L-D) | Inactive |
| Tatiana Suarez | Women's Strawweight | 13-1-0 (W-L-D) | Active | |
| Tatsuro Taira | “The Best” | Flyweight | 18-2-0 (W-L-D) | Active |
| Tatsuya Ando | Bantamweight | 14-4-1 (W-L-D) | Inactive | |
| Tatsuya Kawajiri | “The Crusher” | Featherweight | 36-11-2 (W-L-D) | Inactive |
| Taylor Callens | Lightweight | 6-0-0 (W-L-D) | Inactive | |
| Taylor Johnson | Middleweight | 5-1-0 (W-L-D) | Inactive | |
| Taylor Lapilus | “Double Impact” | Bantamweight | 21-4-0 (W-L-D) | Inactive |
| Taylor Moore | Bantamweight | 10-5-0 (W-L-D) | Inactive | |
| Te Edwards | “Tango” | Lightweight | 6-3-0 (W-L-D) | Inactive |
| Tebaris Gordon | “Boom” | Heavyweight | 3-1-0 (W-L-D) | Inactive |
| Tecia Pennington | “Tiny Tornado” | Women's Strawweight | 15-8-0 (W-L-D) | Inactive |
| Tedd Williams | Heavyweight | 7-1-0 (W-L-D) | Inactive | |
| Teddy Ash | Middleweight | 14-5-0 (W-L-D) | Inactive | |
| Teemu Packalen | “Pacu” | Lightweight | 8-3-0 (W-L-D) | Inactive |
| Teila Tuli | 0-1-0 (W-L-D) | Inactive | ||
| Tereza Bledá | Women's Flyweight | 7-2-0 (W-L-D) | Active | |
| Terrance McKinney | “T. Wrecks” | Lightweight | 18-9-0 (W-L-D) | Active |
| Terrance Saeteurn | “Wrong Turn” | Flyweight | 8-2-0 (W-L-D) | Inactive |
| Terrence Mitchell | Bantamweight | 14-4-0 (W-L-D) | Active | |
| Terrion Ware | “Flash” | Bantamweight | 17-9-0 (W-L-D) | Inactive |
| Terry Etim | Lightweight | 16-5-0 (W-L-D) | Inactive | |
| Terry Martin | Middleweight | 23-11-0 (W-L-D) | Inactive | |
| Teruto Ishihara | “Yashabo” | Bantamweight | 10-7-2 (W-L-D) | Inactive |
| Test Fighter2 | Middleweight | 0-0-0 (W-L-D) | Inactive | |
| Testy Test | “Testy” | Heavyweight | 0-0-0 (W-L-D) | Active |
| Tetsuya Seki | Lightweight | 14-8-1 (W-L-D) | Inactive | |
| Thaddeus Luster | 0-1-0 (W-L-D) | Inactive | ||
| Thales Leites | Middleweight | 28-9-0 (W-L-D) | Inactive | |
| Thanh Le | Featherweight | 6-1-0 (W-L-D) | Inactive | |
| Themba Gorimbo | “Mamba” | Welterweight | 14-7-0 (W-L-D) | Active |
| Theo Rlayang | Featherweight | 5-1-0 (W-L-D) | Inactive | |
| Theodor Berggren | “Simba” | Welterweight | 8-4-0 (W-L-D) | Active |
| Thiago Alves | “Pitbull” | Welterweight | 23-15-0 (W-L-D) | Inactive |
| Thiago Moises | Lightweight | 19-10-0 (W-L-D) | Inactive | |
| Thiago Perpétuo | “Bodão” | Welterweight | 9-4-1 (W-L-D) | Inactive |
| Thiago Santos | “Marreta” | Light Heavyweight | 22-11-0 (W-L-D) | Inactive |
| Thiago Silva | Light Heavyweight | 19-6-0 (W-L-D) | Inactive | |
| Thiago Tavares | Featherweight | 21-7-1 (W-L-D) | Inactive | |
| Thibault Gouti | “GT” | Lightweight | 12-5-0 (W-L-D) | Inactive |
| Thomas Almeida | “Thominhas” | Bantamweight | 22-5-0 (W-L-D) | Inactive |
| Thomas Gifford | “The Young Lion” | Lightweight | 14-9-0 (W-L-D) | Inactive |
| Thomas Paull | Lightweight | 11-4-0 (W-L-D) | Active | |
| Thomas Petersen | “The Train” | Heavyweight | 11-4-0 (W-L-D) | Active |
| Thomas Ramirez | 0-1-0 (W-L-D) | Inactive | ||
| Tiago Dos Santos E Silva | 20-7-2 (W-L-D) | Inactive | ||
| Tiago Trator | Featherweight | 20-6-2 (W-L-D) | Inactive | |
| Tiequan Zhang | “The Wolf” | Lightweight | 18-4-0 (W-L-D) | Inactive |
| Tiffany Masters | “Rainbow Renegade” | Women's Strawweight | 2-1-0 (W-L-D) | Active |
| Tiki Ghosn | Welterweight | 10-7-1 (W-L-D) | Inactive | |
| Tim Boetsch | “The Barbarian” | Middleweight | 21-13-0 (W-L-D) | Inactive |
| Tim Caron | “The Bear” | Middleweight | 7-1-0 (W-L-D) | Inactive |
| Tim Credeur | “Crazy” | Middleweight | 12-4-0 (W-L-D) | Inactive |
| Tim Elliott | Flyweight | 22-14-1 (W-L-D) | Active | |
| Tim Gorman | “The Psycho” | Bantamweight | 9-4-0 (W-L-D) | Inactive |
| Tim Hague | “The Thrashing Machine” | Heavyweight | 21-13-0 (W-L-D) | Inactive |
| Tim Kennedy | Middleweight | 18-6-0 (W-L-D) | Inactive | |
| Tim Lajcik | “The Bohemian” | Heavyweight | 7-6-1 (W-L-D) | Inactive |
| Tim McKenzie | “Wrecking Machine” | Middleweight | 14-9-0 (W-L-D) | Inactive |
| Tim Means | “The Dirty Bird” | Welterweight | 33-17-1 (1 NC) | Active |
| Tim Sylvia | “The Maine-iac” | Heavyweight | 31-10-0 (W-L-D) | Inactive |
| Tim Williams | Middleweight | 15-5-0 (W-L-D) | Inactive | |
| Timmy Cuamba | 10-4-0 (W-L-D) | Inactive | ||
| Timmy Cuamba | “Twilight” | Bantamweight | 10-4-0 (W-L-D) | Active |
| Timo Feucht | Light Heavyweight | 8-1-0 (W-L-D) | Inactive | |
| Timothy Johnson | Heavyweight | 12-4-0 (W-L-D) | Inactive | |
| Timothy Thomas | “The Gorilla” | Heavyweight | 0-0-0 (W-L-D) | Active |
| Timur Valiev | “Lucky” | Bantamweight | 18-3-0 (W-L-D) | Inactive |
| Tina Lahdemaki | “Jelly Bean” | Women's Strawweight | 5-1-0 (W-L-D) | Inactive |
| Tito Ortiz | “The Huntington Beach Bad Boy” | Light Heavyweight | 19-12-1 (W-L-D) | Inactive |
| Toby Misech | “2Quick” | Featherweight | 9-5-0 (W-L-D) | Active |
| Todd Brown | “Bulldog” | Light Heavyweight | 16-4-0 (W-L-D) | Inactive |
| Todd Butler | Lightweight | 1-4-0 (W-L-D) | Inactive | |
| Todd Duffee | Heavyweight | 9-3-0 (1 NC) | Inactive | |
| Todd Medina | 11-9-0 (W-L-D) | Inactive | ||
| Tofiq Musayev | Lightweight | 23-6-0 (W-L-D) | Active | |
| C Tom Aspinall | Heavyweight | 15-3-0 (2 NC) | Active | |
| Tom Blackledge | “The Juggernaut” | Light Heavyweight | 10-7-0 (W-L-D) | Inactive |
| Tom Breese | Middleweight | 12-3-0 (W-L-D) | Inactive | |
| Tom DeBlass | Middleweight | 9-2-0 (W-L-D) | Inactive | |
| Tom Duquesnoy | “Fire Kid” | Bantamweight | 16-2-0 (W-L-D) | Inactive |
| Tom Egan | “The Tank” | Welterweight | 7-5-0 (W-L-D) | Inactive |
| Tom Gallicchio | “Da Tank” | Welterweight | 19-10-0 (W-L-D) | Inactive |
| Tom Lawlor | “Filthy” | Light Heavyweight | 10-6-0 (W-L-D) | Inactive |
| Tom Murphy | Heavyweight | 8-0-0 (W-L-D) | Inactive | |
| Tom Niinimaki | “Stoneface” | Featherweight | 22-8-1 (W-L-D) | Inactive |
| Tom Nolan | “Big Train” | Lightweight | 11-1-0 (W-L-D) | Active |
| Tom Watson | “Kong” | Middleweight | 17-9-0 (W-L-D) | Inactive |
| Tomasz Drwal | “Gorilla” | Middleweight | 21-5-1 (W-L-D) | Inactive |
| Tommy Gantt | Lightweight | 12-0-0 (W-L-D) | Active | |
| Tommy Gantt | Inactive | |||
| Tommy Hayden | “Wild Card” | Featherweight | 11-3-0 (W-L-D) | Inactive |
| Tommy McMillen | “Gun” | Featherweight | 11-0-0 (W-L-D) | Active |
| Tommy Speer | “The Farmboy” | Welterweight | 21-7-0 (W-L-D) | Inactive |
| Tony DeSouza | Welterweight | 11-4-0 (W-L-D) | Inactive | |
| Tony Ferguson | “El Cucuy” | Welterweight | 26-11-0 (W-L-D) | Inactive |
| Tony Fryklund | 14-9-1 (W-L-D) | Inactive | ||
| Tony Gravely | Bantamweight | 23-9-0 (W-L-D) | Inactive | |
| Tony Halme | Heavyweight | 0-4-0 (W-L-D) | Inactive | |
| Tony Johnson | Light Heavyweight | 11-3-0 (W-L-D) | Inactive | |
| Tony Kelley | “Primetime” | Bantamweight | 8-3-0 (W-L-D) | Inactive |
| Tony Petarra | 2-3-1 (W-L-D) | Inactive | ||
| Tony Peterra | Middleweight | 0-0-0 (W-L-D) | Inactive | |
| Tony Sims | Lightweight | 12-4-0 (W-L-D) | Inactive | |
| Tonya Evinger | “Triple Threat” | Featherweight | 19-8-0 (W-L-D) | Inactive |
| Top Noi Kiwram | “Tiger Muay Thai” | Flyweight | 9-5-0 (W-L-D) | Active |
| Tor Troeng | “The Hammer” | Middleweight | 16-7-1 (W-L-D) | Inactive |
| Torrez Finney | “The Punisher” | Middleweight | 11-1-0 (W-L-D) | Active |
| Toshiomi Kazama | Bantamweight | 11-5-0 (W-L-D) | Active | |
| Townsend Saunders | Lightweight | 0-2-0 (W-L-D) | Inactive | |
| Tra Telligman | “Trauma” | Heavyweight | 7-5-1 (W-L-D) | Inactive |
| Tracy Cortez | Women's Flyweight | 12-4-0 (W-L-D) | Active | |
| Travis Browne | “Hapa” | Heavyweight | 18-7-1 (W-L-D) | Active |
| Travis Fulton | Heavyweight | 253-53-10 (W-L-D) | Inactive | |
| Travis Lutter | “The Serial Killer” | Middleweight | 10-6-0 (W-L-D) | Inactive |
| Travis Wiuff | “The Diesel” | Light Heavyweight | 75-21-0 (W-L-D) | Inactive |
| Trent Jenkins | Middleweight | 0-4-0 (W-L-D) | Inactive | |
| Tresean Gore | “Mr. Vicious” | Middleweight | 7-4-0 (W-L-D) | Active |
| Trevin Giles | Welterweight | 16-7-0 (W-L-D) | Inactive | |
| Trevin Jones | “5 Star” | Bantamweight | 13-10-0 (W-L-D) | Inactive |
| Trevor Peek | Featherweight | 9-3-0 (W-L-D) | Active | |
| Trevor Prangley | Middleweight | 34-11-2 (W-L-D) | Inactive | |
| Trevor Smith | “Hot Sauce” | Middleweight | 15-10-0 (W-L-D) | Inactive |
| Trey Ogden | “Shamurai” | Lightweight | 18-7-0 (W-L-D) | Active |
| Trey Waters | “The Truth” | Welterweight | 9-2-0 (W-L-D) | Active |
| Tre’ston Vines | “TVTime” | Middleweight | 10-4-0 (W-L-D) | Active |
| Tristan Connelly | “Boondock” | Featherweight | 14-8-0 (W-L-D) | Inactive |
| Troy Mandaloniz | “Rude Boy” | Welterweight | 3-2-0 (W-L-D) | Inactive |
| Tsuyoshi Kohsaka | 27-19-2 (W-L-D) | Inactive | ||
| Tsuyoshi Kosaka | “TK” | Heavyweight | 18-9-1 (W-L-D) | Inactive |
| Tucker Lutz | “Top Gun” | Featherweight | 12-4-0 (W-L-D) | Active |
| Tuco Tokkos | Light Heavyweight | 11-6-0 (W-L-D) | Inactive | |
| Tulio Palhares | Middleweight | 2-16-0 (W-L-D) | Inactive | |
| Ty Flores | Light Heavyweight | 7-3-0 (W-L-D) | Active | |
| Ty Miller | “Thriller” | Welterweight | 7-0-0 (W-L-D) | Active |
| Tyler Diamond | Featherweight | 9-1-0 (W-L-D) | Inactive | |
| Tyler Hill | “Zombie” | Welterweight | 8-2-0 (W-L-D) | Inactive |
| Tyler Toner | “Thunder” | Featherweight | 15-7-0 (W-L-D) | Inactive |
| Tyrell Fortune | Heavyweight | 18-3-0 (W-L-D) | Active | |
| Tyron Woodley | “The Chosen One” | Welterweight | 19-7-1 (W-L-D) | Inactive |
| Tyrone Roberts | Middleweight | 43-12-1 (W-L-D) | Inactive | |
| Tyson Griffin | Featherweight | 16-8-0 (W-L-D) | Inactive | |
| Tyson Nam | Flyweight | 21-14-1 (W-L-D) | Inactive | |
| Tyson Pedro | Light Heavyweight | 10-5-0 (W-L-D) | Inactive | |
| Ulka Sasaki | Flyweight | 20-6-2 (W-L-D) | Inactive | |
| Ulysses Gomez | “Useless” | Flyweight | 9-5-0 (W-L-D) | Inactive |
| Umar Nurmagomedov | Bantamweight | 20-1-0 (W-L-D) | Active | |
| Uran Satybaldiev | “Gorilla” | Light Heavyweight | 9-1-0 (W-L-D) | Active |
| Uriah Hall | “Prime Time” | Middleweight | 18-11-0 (W-L-D) | Inactive |
| Urijah Faber | “The California Kid” | Bantamweight | 35-11-0 (W-L-D) | Inactive |
| Uroš Medić | “The Doctor” | Welterweight | 13-3-0 (W-L-D) | Active |
| Vagner Rocha | “Ceara” | Lightweight | 14-4-0 (W-L-D) | Active |
| Val Woodburn | “The Animal” | Welterweight | 7-2-0 (W-L-D) | Active |
| C Valentina Shevchenko | “Bullet” | Women's Flyweight | 26-4-1 (W-L-D) | Active |
| Valeri Ignatov | Lightweight | 1-2-0 (W-L-D) | Inactive | |
| Valerie Letourneau | “Trouble” | Women's Strawweight | 8-6-0 (W-L-D) | Inactive |
| Valesca Machado | “Tina Black” | Women's Strawweight | 8-3-0 (W-L-D) | Inactive |
| Valmir Lazaro | “Bidu” | Lightweight | 15-5-0 (W-L-D) | Inactive |
| Valter Walker | “The Clean Monster” | Heavyweight | 15-1-0 (W-L-D) | Active |
| Vanessa Demopoulos | “Lil Monster” | Women's Flyweight | 11-8-0 (W-L-D) | Active |
| Vanessa Melo | Women's Bantamweight | 11-8-0 (W-L-D) | Inactive | |
| Vaughan Lee | Bantamweight | 14-13-1 (W-L-D) | Inactive | |
| Vernon Ramos | Welterweight | 3-1-0 (W-L-D) | Inactive | |
| Vernon Ramos Ho | 3-1-0 (W-L-D) | Inactive | ||
| Vernon White | “Tiger” | Light Heavyweight | 26-33-2 (W-L-D) | Inactive |
| Veronica Hardy | Women's Flyweight | 10-5-1 (W-L-D) | Active | |
| Viacheslav Borshchev | “Slava Claus” | Lightweight | 8-7-1 (W-L-D) | Inactive |
| Vicente Luque | “The Silent Assassin” | Middleweight | 24-12-1 (W-L-D) | Active |
| Victor Altamirano | “El Magnifico” | Flyweight | 12-5-0 (W-L-D) | Inactive |
| Victor Dias | “Crazy Horse” | Flyweight | 11-3-0 (W-L-D) | Active |
| Victor Henry | “La Mangosta” | Bantamweight | 25-7-0 (1 NC) | Active |
| Victor Hugo | “Striker” | Featherweight | 25-5-0 (W-L-D) | Inactive |
| Victor Madrigal | Bantamweight | 15-5-0 (W-L-D) | Active | |
| Victor Martinez | “The Brick” | Lightweight | 13-7-0 (W-L-D) | Inactive |
| Victor Reyna | Welterweight | 11-5-0 (W-L-D) | Inactive | |
| Victor Rodriguez | “Vicious” | Flyweight | 7-4-0 (W-L-D) | Inactive |
| Victor Valenzuela | “Joe Boxer” | 14-4-0 (W-L-D) | Inactive | |
| Victor Valimaki | “The Matrix” | Light Heavyweight | 18-10-0 (W-L-D) | Inactive |
| Victoria Leonardo | “Fury” | Women's Flyweight | 9-7-0 (W-L-D) | Inactive |
| Vik Grujic | “The Spartan” | Welterweight | 6-6-0 (W-L-D) | Inactive |
| Viktor Pesta | Heavyweight | 10-4-0 (W-L-D) | Inactive | |
| Viktoriia Dudakova | Women's Strawweight | 8-2-0 (W-L-D) | Inactive | |
| Vinc Pichel | “From Hell” | Lightweight | 14-5-0 (W-L-D) | Inactive |
| Vince Cachero | “The Anomaly” | Bantamweight | 7-4-0 (W-L-D) | Inactive |
| Vince Morales | “Vandetta” | Bantamweight | 16-11-0 (W-L-D) | Inactive |
| Vince Murdock | Featherweight | 12-4-0 (W-L-D) | Inactive | |
| Vineesh Subrahmanyan | “Vini” | Light Heavyweight | 0-0-0 (W-L-D) | Active |
| Vinicius Cenci | Lightweight | 7-2-0 (W-L-D) | Active | |
| Vinicius Moreira | “Mamute” | Light Heavyweight | 9-5-0 (W-L-D) | Inactive |
| Vinicius Oliveira | “LokDog” | Featherweight | 24-4-0 (W-L-D) | Active |
| Vinicius Queiroz | “Spartan” | Heavyweight | 8-4-0 (W-L-D) | Inactive |
| Vinicius Salvador | Bantamweight | 14-7-0 (W-L-D) | Inactive | |
| Vinny Magalhaes | “Pezao” | Light Heavyweight | 14-9-0 (W-L-D) | Inactive |
| Virna Jandiroba | “Carcara” | Women's Strawweight | 23-4-0 (W-L-D) | Active |
| Viscardi Andrade | Welterweight | 19-6-0 (W-L-D) | Inactive | |
| Vitor Belfort | “The Phenom” | Middleweight | 26-14-0 (W-L-D) | Inactive |
| Vitor Miranda | “Lex Luthor” | Middleweight | 12-5-0 (W-L-D) | Inactive |
| Vitor Petrino | Heavyweight | 14-2-0 (W-L-D) | Active | |
| Viviane Araújo | “Vivi” | Women's Flyweight | 13-7-0 (W-L-D) | Inactive |
| Viviane Pereira | “Sucuri” | Women's Strawweight | 13-2-0 (W-L-D) | Inactive |
| Vladimir Matyushenko | “The Janitor” | Light Heavyweight | 27-8-0 (W-L-D) | Inactive |
| Vlasto Cepo | Middleweight | 14-3-0 (W-L-D) | Active | |
| Volkan Oezdemir | “No Time” | Light Heavyweight | 21-8-0 (W-L-D) | Active |
| Wade Shipp | “The Nightmare” | Heavyweight | 11-5-0 (W-L-D) | Inactive |
| Wagner Campos | “Galeto” | Featherweight | 12-10-0 (W-L-D) | Inactive |
| Wagner Prado | “Caldeirao” | Light Heavyweight | 12-3-0 (1 NC) | Inactive |
| Wagner Silva | “Wagnão” | Welterweight | 6-3-0 (W-L-D) | Inactive |
| Wagnney Fabiano | Featherweight | 16-4-0 (W-L-D) | Inactive | |
| Waldo Cortes Acosta | “Salsa Boy” | Heavyweight | 17-3-0 (W-L-D) | Active |
| Walel Watson | “The Gazelle” | Bantamweight | 14-10-0 (W-L-D) | Inactive |
| Wallen Del Rosario | Flyweight | 8-2-0 (W-L-D) | Inactive | |
| Wallid Ismail | Lightweight | 9-3-0 (W-L-D) | Inactive | |
| Walt Harris | “The Big Ticket” | Heavyweight | 13-10-0 (W-L-D) | Inactive |
| Wanderlei Silva | “The Axe Murderer” | Light Heavyweight | 35-13-1 (W-L-D) | Inactive |
| Wang Anying | “Smiley” | Welterweight | 2-2-0 (W-L-D) | Inactive |
| Wang Cong | “The Joker” | Women's Flyweight | 10-1-0 (W-L-D) | Active |
| Wang Guan | “The Dongbei Tiger” | Featherweight | 20-1-1 (W-L-D) | Inactive |
| Wang Sai | “The Fire Kylin” | Welterweight | 8-5-1 (W-L-D) | Inactive |
| War Machine | 14-5-0 (W-L-D) | Inactive | ||
| Warlley Alves | Middleweight | 15-8-0 (W-L-D) | Inactive | |
| Waylon Lowe | Lightweight | 16-7-0 (W-L-D) | Inactive | |
| We Are Live! | 13-2-0 (W-L-D) | Inactive | ||
| Wellington Turman | “The Prodigy” | Welterweight | 18-8-0 (W-L-D) | Active |
| Wendell Oliveira | Welterweight | 24-9-0 (W-L-D) | Inactive | |
| Wendell Oliveira Marques | 29-10-0 (W-L-D) | Inactive | ||
| Wendri Patilima | Lightweight | 0-1-0 (W-L-D) | Active | |
| Wes Albritton | Lightweight | 0-1-0 (W-L-D) | Inactive | |
| Wes Combs | “The Soldier” | Light Heavyweight | 20-6-0 (W-L-D) | Inactive |
| Wes Schultz | “Party Time” | Middleweight | 9-3-0 (W-L-D) | Active |
| Wes Sims | “The Project” | Heavyweight | 24-14-1 (W-L-D) | Inactive |
| Wesley Correira | “Cabbage” | Heavyweight | 20-16-0 (W-L-D) | Inactive |
| Westin Wilson | Featherweight | 17-10-0 (W-L-D) | Inactive | |
| Will Brooks | “Ill Will” | Lightweight | 18-4-0 (W-L-D) | Inactive |
| Will Campuzano | Flyweight | 14-6-0 (W-L-D) | Inactive | |
| Will Chope | “The Kill” | Featherweight | 34-13-0 (W-L-D) | Inactive |
| Will Santiago | “The Brown Bomber” | Middleweight | 9-5-0 (W-L-D) | Inactive |
| Willamy Freire | “Chiquerim” | Lightweight | 26-6-0 (W-L-D) | Inactive |
| William Gomis | “Jaguar” | Featherweight | 15-4-0 (W-L-D) | Active |
| William Knight | “Nightmare” | Light Heavyweight | 11-5-0 (W-L-D) | Inactive |
| William Macario | “Patolino” | Welterweight | 9-3-0 (W-L-D) | Inactive |
| William Marcario | “Patolino” | Welterweight | 0-0-0 (W-L-D) | Inactive |
| Willian Souza | Bantamweight | 0-0-0 (W-L-D) | Active | |
| Willie Gates | “Whoop Ass” | Flyweight | 12-7-0 (W-L-D) | Inactive |
| Wilson Gouveia | Middleweight | 14-8-0 (W-L-D) | Inactive | |
| Wilson Reis | Flyweight | 23-10-0 (W-L-D) | Inactive | |
| WonBin Ki | Lightweight | 18-9-0 (W-L-D) | Inactive | |
| Wu Yanan | “Mulan” | Women's Bantamweight | 13-6-0 (W-L-D) | Inactive |
| Wuliji Buren | “Beast Master” | Bantamweight | 10-8-0 (W-L-D) | Inactive |
| Wulijiburen | 20-9-0 (W-L-D) | Inactive | ||
| Wuziazibieke Jiahefu | Featherweight | 29-12-1 (W-L-D) | Active | |
| Xavier Foupa-Pokam | “The Professor X” | Middleweight | 32-22-0 (W-L-D) | Inactive |
| Xiao Long | Bantamweight | 27-11-0 (W-L-D) | Active | |
| Xie Bin | Featherweight | 15-6-0 (W-L-D) | Inactive | |
| Xiong Jingnan | 19-3-0 (W-L-D) | Inactive | ||
| Yadier del Valle | “The Cuban Problem” | Featherweight | 10-1-0 (W-L-D) | Active |
| Yair Rodriguez | “El Pantera” | Featherweight | 21-6-0 (1 NC) | Active |
| Yamato Nishikawa | Lightweight | 21-3-6 (W-L-D) | Inactive | |
| Yan Cabral | Lightweight | 13-3-0 (W-L-D) | Inactive | |
| Yan Xiaonan | Women's Strawweight | 19-5-0 (W-L-D) | Active | |
| Yana Santos | Women's Bantamweight | 17-8-0 (W-L-D) | Active | |
| Yanal Ashmouz | “Red Fox” | Lightweight | 8-2-0 (W-L-D) | Inactive |
| Yancy Medeiros | Lightweight | 15-8-0 (W-L-D) | Inactive | |
| Yanis Ghemmouri | “The Desert Warrior” | Bantamweight | 12-3-0 (W-L-D) | Inactive |
| Yao Zhikui | “The Conqueror” | Flyweight | 2-4-0 (W-L-D) | Inactive |
| Yaotzin Meza | Featherweight | 21-11-0 (W-L-D) | Inactive | |
| Yaroslav Amosov | Welterweight | 30-1-0 (W-L-D) | Active | |
| Yasuhiro Urushitani | Flyweight | 21-8-6 (W-L-D) | Inactive | |
| Yazan Hajeh | “Yazzle Dazzle” | Featherweight | 6-1-0 (W-L-D) | Active |
| Yazmin Jauregui | Women's Strawweight | 11-2-0 (W-L-D) | Active | |
| YeDam Seo | Women's Strawweight | 7-4-0 (W-L-D) | Inactive | |
| YiSak Lee | “The Tank” | Middleweight | 8-2-0 (W-L-D) | Active |
| YiSak Lee | Inactive | |||
| Yilizhati Maimaitijiang | Middleweight | 7-1-0 (W-L-D) | Inactive | |
| Yizha | 26-6-0 (W-L-D) | Inactive | ||
| Yizha | Featherweight | 26-6-0 (W-L-D) | Active | |
| Yoel Romero | “Soldier of God” | Middleweight | 13-5-0 (W-L-D) | Inactive |
| Yohan Lainesse | “White Lion” | Welterweight | 9-3-0 (W-L-D) | Inactive |
| Yoislandy Izquierdo | “Cuba” | Lightweight | 10-4-0 (W-L-D) | Inactive |
| Yoji Anjo | “Mr. 200%” | Middleweight | 0-5-1 (W-L-D) | Inactive |
| Yorgan De Castro | “The Mad Titan” | Heavyweight | 6-3-0 (W-L-D) | Inactive |
| Yosdenis Cedeno | “The Pink Panther” | Lightweight | 10-6-1 (W-L-D) | Inactive |
| Yoshihiro Akiyama | “Sexyama” | Welterweight | 14-6-0 (W-L-D) | Inactive |
| Yoshiki Takahashi | Lightweight | 30-27-3 (W-L-D) | Inactive | |
| Yoshinori Horie | Featherweight | 8-2-0 (W-L-D) | Inactive | |
| Yoshiyuki Yoshida | “Zenko” | Welterweight | 18-9-0 (W-L-D) | Inactive |
| Yousri Belgaroui | Middleweight | 10-3-0 (W-L-D) | Active | |
| Youssef Zalal | “The Moroccan Devil” | Featherweight | 18-6-1 (W-L-D) | Active |
| Yui Chul Nam | “The Korean Bulldozer” | Featherweight | 18-8-1 (W-L-D) | Inactive |
| Yuki Kondo | Light Heavyweight | 60-33-9 (W-L-D) | Inactive | |
| Yuki Sasaki | Middleweight | 25-22-2 (W-L-D) | Inactive | |
| Yuma Horiuchi | Flyweight | 9-5-0 (W-L-D) | Inactive | |
| Yuneisy Duben | Women's Flyweight | 6-2-0 (W-L-D) | Active | |
| Yuri Alcantara | Inactive | |||
| Yuri Arukantara | Inactive | |||
| Yuri Vaulin | Lightweight | 0-1-0 (W-L-D) | Inactive | |
| Yuri Villefort | Welterweight | 10-5-0 (W-L-D) | Inactive | |
| Yusaku Kinoshita | Welterweight | 6-3-0 (W-L-D) | Inactive | |
| Yushin Okami | “Thunder” | Welterweight | 34-12-0 (W-L-D) | Inactive |
| Yusuke Kasuya | Lightweight | 9-3-0 (W-L-D) | Inactive | |
| Yuta Sasaki | 21-6-2 (W-L-D) | Inactive | ||
| Yves Edwards | Lightweight | 42-22-1 (W-L-D) | Inactive | |
| Yves Jabouin | “Tiger” | Bantamweight | 20-11-0 (W-L-D) | Inactive |
| Zabit Magomedsharipov | Featherweight | 18-1-0 (W-L-D) | Inactive | |
| Zac Pauga | “The Ripper” | Light Heavyweight | 7-3-0 (W-L-D) | Inactive |
| Zach Borrego | Middleweight | 0-1-0 (W-L-D) | Active | |
| Zach Light | “The Lisbon Outlaw” | Welterweight | 9-11-0 (W-L-D) | Inactive |
| Zach Makovsky | “Fun Size” | Flyweight | 20-8-0 (W-L-D) | Inactive |
| Zach Reese | 10-4-0 (W-L-D) | Inactive | ||
| Zach Scroggin | Welterweight | 7-1-0 (W-L-D) | Inactive | |
| Zach Zane | “Dub-Z” | Welterweight | 10-7-0 (W-L-D) | Active |
| Zachary Reese | “Savage” | Middleweight | 10-4-0 (W-L-D) | Active |
| Zak Cummings | Light Heavyweight | 25-7-0 (W-L-D) | Inactive | |
| Zak Ottow | “The Barbarian” | Welterweight | 17-7-0 (W-L-D) | Inactive |
| Zane Frazier | “Nasty” | Heavyweight | 4-11-0 (W-L-D) | Inactive |
| Zarah Fairn | “Infinite” | Women's Bantamweight | 6-6-0 (W-L-D) | Active |
| Zarrukh Adashev | “The Lion” | Flyweight | 4-4-0 (W-L-D) | Inactive |
| Zelim Imadaev | 8-3-0 (W-L-D) | Inactive | ||
| Zhalgas Zhumagulov | Flyweight | 14-9-0 (W-L-D) | Inactive | |
| Zhang Lipeng | “The Warrior” | Lightweight | 23-9-1 (W-L-D) | Inactive |
| Zhang Mingyang | “Mountain Tiger” | Light Heavyweight | 19-8-0 (W-L-D) | Active |
| Zhang Tiequan | 15-4-0 (W-L-D) | Inactive | ||
| Zhang Weili | “Magnum” | Women's Flyweight | 26-4-0 (W-L-D) | Active |
| Zhu Kangjie | Featherweight | 21-5-0 (W-L-D) | Active | |
| Zu Anyanwu | “8th Wonder” | Heavyweight | 14-5-0 (W-L-D) | Inactive |
| Zubaira Tukhugov | “Warrior” | Lightweight | 20-6-1 (W-L-D) | Inactive |
| Zviad Lazishvili | Bantamweight | 13-1-0 (W-L-D) | Inactive | |
| Zygimantas Ramaska | Featherweight | 9-3-0 (W-L-D) | Inactive |