| Yan Cabral (inactive) | | 2-3-0 | Brazil | May 8, 2016 |
| Alex Caceres (inactive) | Bruce Leeroy | 16-13-0 (1 NC) | United States | May 11, 2024 |
| Vince Cachero (inactive) | The Anomaly | 0-2-0 | United States | Feb 27, 2021 |
| Priscila Cachoeira | Zombie Girl | 5-9-0 | Brazil | Jun 6, 2026 |
| Nicolle Caliari | | 1-2-0 | Brazil | May 16, 2026 |
| Cynthia Calvillo | | 6-6-1 | United States | Apr 8, 2023 |
| Frank Camacho (inactive) | The Crank | 2-6-0 | United States | May 14, 2022 |
| Matheus Camilo | Jaguar | 2-1-0 | Brazil | Jun 27, 2026 |
| Fabricio Camoes (inactive) | Morango | 1-4-1 | Brazil | Oct 25, 2014 |
| Brian Camozzi (inactive) | Mantis | 0-3-0 | United States | Feb 18, 2018 |
| Chris Camozzi (inactive) | | 9-10-0 | United States | May 28, 2017 |
| Charlie Campbell | The Cannibal | 2-1-0 | United States | Sep 27, 2025 |
| Kurtis Campbell | The Pink Panther | 1-1-0 | United Kingdom | Sep 5, 2026 |
| Shane Campbell (inactive) | Shaolin | 1-4-0 | Canada | Aug 27, 2016 |
| John Campetella (inactive) | | 0-1-0 | Unknown | Jul 12, 1996 |
| Wagner Campos (inactive) | Galeto | 0-1-0 | Unknown | Jun 23, 2012 |
| Will Campuzano (inactive) | | 0-4-0 | Mexico | Mar 15, 2014 |
| Aleksa Camur | | 1-3-0 | Bosnia & Herzegovina | Aug 5, 2023 |
| Chico Camus (inactive) | The King | 3-4-0 (1 NC) | United States | Sep 26, 2015 |
| Asbel Cancio (inactive) | | 0-1-0 | Unknown | Apr 7, 1995 |
| Carlos Candelario | The Cannon | 0-2-0 | United States | Nov 5, 2022 |
| Luiz Cane (inactive) | Banha | 4-5-0 | Brazil | Oct 13, 2012 |
| Guido Cannetti (inactive) | Ninja | 4-6-0 | Argentina | Mar 11, 2023 |
| Jared Cannonier | The Killa Gorilla | 11-10-0 | United States | Jul 18, 2026 |
| Steve Cantwell (inactive) | The Robot | 1-5-0 | United States | Feb 25, 2012 |
| Gigi Canuto | Diamond | 0-1-0 | Brazil | Aug 8, 2026 |
| Frank Caracci (inactive) | | 0-1-0 | Unknown | Jan 8, 1999 |
| Bryan Caraway (inactive) | Kid Lightning | 6-4-0 | United States | Nov 30, 2018 |
| Chris Cariaso (inactive) | Kamikaze | 7-6-0 | United States | Oct 3, 2015 |
| Rafael Carino (inactive) | | 1-0-0 | Unknown | May 17, 1996 |
| Spike Carlyle (inactive) | Alpha Ginger | 1-2-0 | United States | Nov 28, 2020 |
| Francis Carmont (inactive) | Limitless | 6-3-0 | France | Aug 23, 2014 |
| Liz Carmouche (inactive) | Girlrilla | 5-5-0 | Unknown | Aug 10, 2019 |
| Roan Carneiro (inactive) | Jucao | 4-5-0 | Brazil | Feb 11, 2017 |
| Ariane Carnelossi (inactive) | Sorriso | 3-4-0 | Brazil | Jun 6, 2026 |
| Luana Carolina (inactive) | Dread | 6-4-0 | Brazil | Sep 27, 2025 |
| Clayton Carpenter | | 2-3-0 | United States | May 9, 2026 |
| Cain Carrizosa (inactive) | The Insane | 0-2-0 | United States | Mar 21, 2015 |
| Shonie Carter (inactive) | Mr. International | 3-3-0 | United States | Dec 13, 2006 |
| Antonio Carvalho (inactive) | Pato | 2-2-0 | Canada | Mar 16, 2013 |
| Shane Carwin (inactive) | The Engineer | 4-2-0 | United States | Jun 11, 2011 |
| Johnny Case (inactive) | Hollywood | 4-2-0 | United States | Jun 25, 2017 |
| Cortney Casey | Cast Iron | 6-9-0 | United States | Jul 9, 2022 |
| Kevin Casey (inactive) | King | 1-3-1 (2 NC) | United States | Aug 27, 2016 |
| Dwayne Cason (inactive) | | 1-1-0 | United States | Oct 17, 1997 |
| John Castaneda | Sexi Mexi | 4-5-1 | United States | Sep 26, 2026 |
| Danny Castillo (inactive) | Last Call | 7-7-0 | United States | Dec 19, 2015 |
| Gil Castillo (inactive) | | 1-2-0 | United States | Nov 22, 2002 |
| Yorgan De Castro (inactive) | The Mad Titan | 1-3-0 | Cape Verde | Apr 10, 2021 |
| Nick Catone (inactive) | The Jersey Devil | 4-4-0 | United States | Feb 1, 2014 |
| Luke Caudillo (inactive) | Lil' Hulk | 0-2-0 | United States | Nov 17, 2007 |
| Rafael Cavalcante (inactive) | Feijao | 1-4-0 | Brazil | Feb 6, 2016 |
| Jacqueline Cavalcanti | | 5-1-0 | Brazil | May 16, 2026 |
| Liu Ce | The Oriental Dragon | 1-0-0 | China | Aug 29, 2026 |
| Magnus Cedenblad (inactive) | Jycken | 4-2-0 | Sweden | Nov 19, 2016 |
| Yosdenis Cedeno (inactive) | Pink Panther | 1-3-0 | Unknown | Jul 11, 2015 |
| Henry Cejudo (inactive) | Triple C | 10-6-0 | United States | Dec 6, 2025 |
| Adam Cella (inactive) | El Naturel | 0-1-0 | Unknown | Apr 6, 2013 |
| Vlasto Cepo | El Chapo | 0-1-0 | Serbia | Aug 1, 2026 |
| Katlyn Cerminara | Blonde Fighter | 11-6-0 | United States | Mar 9, 2024 |
| Rafael Cerqueira (inactive) | The Lion | 0-4-0 | Brazil | Nov 22, 2025 |
| Donald Cerrone (inactive) | Cowboy | 23-14-0 (1 NC) | United States | Jul 2, 2022 |
| Luan Chagas (inactive) | Tarzan | 1-2-1 | Brazil | Apr 21, 2018 |
| Edgar Chairez | Puro Chicali | 4-3-0 (1 NC) | Mexico | Sep 12, 2026 |
| Ansar Chalangov (inactive) | | 0-2-0 | Russia | Apr 6, 2006 |
| Alex Chambers (inactive) | Astro Girl | 1-4-0 | Australia | Sep 22, 2018 |
| Chelsea Chandler | | 3-3-0 | United States | Jun 6, 2026 |
| Michael Chandler | Iron | 2-6-0 | United States | Jun 14, 2026 |
| Eduardo Chapolin | | 0-1-0 | Brazil | Aug 15, 2026 |
| Donnie Chappell (inactive) | | 0-1-0 | United States | Jul 27, 1997 |
| Joe Charles (inactive) | The Ghetto Man | 2-2-0 | Unknown | Dec 21, 1997 |
| Morgan Charriere | The Last Pirate | 3-4-0 | France | Sep 5, 2026 |
| Terrance Chatman | The Answer | 0-1-0 | United States | Aug 22, 2026 |
| Jeisla Chaves | A Braba | 1-1-0 | Brazil | Aug 22, 2026 |
| Danny Chavez (inactive) | The Colombian Warrior | 1-2-1 | United States | Jun 18, 2022 |
| Ernest Chavez (inactive) | EJ | 1-2-0 | United States | Oct 4, 2014 |
| Albert Cheng (inactive) | | 0-1-0 | Canada | Mar 1, 2014 |
| Fabio Cherant (inactive) | Water Buffalo | 0-3-0 | United States | Feb 12, 2022 |
| Macy Chiasson | | 8-6-0 | United States | Feb 28, 2026 |
| Michael Chiesa (inactive) | Maverick | 15-7-0 | United States | Mar 28, 2026 |
| Giga Chikadze | Ninja | 8-5-0 | Georgia | Sep 19, 2026 |
| Khamzat Chimaev | Borz | 9-1-0 | Unknown | May 9, 2026 |
| Alessio Di Chirico (inactive) | Manzo | 4-7-0 | Italy | Sep 3, 2022 |
| Sako Chivitchian (inactive) | | 0-1-0 | Armenia | Dec 4, 2010 |
| DongHun Choi | | 1-0-0 | South Korea | Nov 23, 2024 |
| Dooho Choi | The Korean Superboy | 6-4-1 | South Korea | Sep 19, 2026 |
| SeungGuk Choi (inactive) | | 0-1-0 | Unknown | Feb 4, 2023 |
| SeungWoo Choi (inactive) | Sting | 4-7-0 | South Korea | Mar 15, 2025 |
| Mark Choinski | The Shark | 0-1-0 | United States | Jun 7, 2025 |
| Levan Chokheli | | 1-0-0 | Georgia | Jun 20, 2026 |
| John Cholish (inactive) | | 1-2-0 | United States | May 18, 2013 |
| Ryo Chonan (inactive) | Piranah | 1-3-0 | Japan | Apr 18, 2009 |
| Will Chope (inactive) | The Kill | 0-1-0 | United States | Jan 4, 2014 |
| Joachim Christensen (inactive) | | 1-3-0 | Denmark | Jun 25, 2017 |
| Kevin Christian | | 0-2-0 | Brazil | May 2, 2026 |
| Dan Christison (inactive) | The Sandman | 1-1-0 | United States | Jul 8, 2006 |
| Anthony Christodoulou (inactive) | | 0-2-0 | United States | Aug 8, 2015 |
| Mike Ciesnolevicz (inactive) | | 1-1-0 | United States | Jun 20, 2009 |
| Hannah Cifers (inactive) | Shockwave | 2-5-0 | United States | Aug 29, 2020 |
| Misha Cirkunov (inactive) | | 6-7-0 | Latvia | Oct 15, 2022 |
| Devin Clark | Brown Bear | 8-9-0 | United States | Feb 10, 2024 |
| Heather Clark (inactive) | Hurricane | 1-2-0 | United States | Nov 5, 2016 |
| Jessica-Rose Clark (inactive) | | 4-5-0 | Australia | May 13, 2023 |
| Laverne Clark (inactive) | | 4-1-0 | United States | Sep 22, 2000 |
| Logan Clark (inactive) | | 1-0-0 | United States | Dec 13, 2006 |
| Mitch Clarke (inactive) | Danger Zone | 2-5-0 | Unknown | Sep 9, 2017 |
| Rich Clementi (inactive) | No Love | 5-5-0 | United States | Feb 7, 2009 |
| Chris Clements (inactive) | The Menace | 2-2-0 (1 NC) | Canada | Apr 25, 2015 |
| Ron van Clief (inactive) | The Black Dragon | 0-1-0 | United States | Dec 16, 1994 |
| Josh Clopton (inactive) | The Gentleman | 0-2-0 | United States | Aug 3, 2013 |
| Brian Cobb (inactive) | | 0-1-0 | United States | Feb 21, 2009 |
| John Cofer (inactive) | The Potter | 0-2-0 | United States | Dec 15, 2012 |
| Felipe Colares (inactive) | Cabocao | 2-4-0 | Brazil | May 21, 2022 |
| Mark Coleman (inactive) | The Hammer | 7-5-0 | United States | Feb 6, 2010 |
| Clay Collard (inactive) | Cassius | 1-3-0 | United States | Sep 5, 2015 |
| Jake Collier | The Prototype | 5-9-0 | United States | Sep 23, 2023 |
| Shane Collins | Hollywood | 1-0-0 | United States | Jun 20, 2026 |
| Christian Colombo (inactive) | | 0-2-1 | Denmark | Oct 28, 2017 |
| Wes Combs (inactive) | The Soldier | 0-2-0 | United States | Aug 26, 2006 |
| Carlos Condit (inactive) | The Natural Born Killer | 9-10-0 | United States | Jul 10, 2021 |
| Chris Condo (inactive) | | 0-1-0 | United States | May 7, 1999 |
| Wang Cong | The Joker | 5-2-0 | China | Oct 3, 2026 |
| Tristan Connelly (inactive) | Boondock | 1-2-0 | Canada | Apr 30, 2022 |
| Bob Cook (inactive) | Crazy | 1-0-0 | Unknown | Mar 10, 2000 |
| Amanda Cooper (inactive) | ABC | 2-4-0 | United States | Nov 10, 2018 |
| Chris Cope (inactive) | C-Murder | 1-2-0 | United States | Feb 4, 2012 |
| Kit Cope (inactive) | Havoc | 0-1-0 | United States | Nov 5, 2005 |
| Josh Copeland (inactive) | Cuddly Bear | 0-2-0 | United States | Mar 14, 2015 |
| Akira Corassani (inactive) | | 3-3-0 | United States | Jan 24, 2015 |
| Alden Coria | Cobra | 3-1-0 | United States | Oct 3, 2026 |
| Daniel Cormier (inactive) | DC | 11-3-0 (1 NC) | United States | Aug 15, 2020 |
| Nora Cornolle | | 4-3-0 | France | Sep 5, 2026 |
| Bethe Correia (inactive) | Pitbull | 5-6-1 | Brazil | Oct 2, 2021 |
| Wesley Correira (inactive) | Cabbage | 2-2-0 | United States | Apr 2, 2004 |
| Tracy Cortez | | 6-3-0 | United States | Jul 11, 2026 |
| Louis Cosce (inactive) | | 0-2-0 | United States | Sep 17, 2022 |
| Orion Cosce (inactive) | Galaxy | 1-2-0 | United States | May 20, 2023 |
| Alessandro Costa | Nono | 5-3-0 | Brazil | Jul 11, 2026 |
| Melquizael Costa | The Dalmatian | 7-3-0 | Brazil | May 16, 2026 |
| Paulo Costa | The Eraser | 8-4-0 | Brazil | Apr 11, 2026 |
| Randy Costa (inactive) | The Zohan | 2-4-0 | United States | Oct 1, 2022 |
| Patrick Cote (inactive) | The Predator | 10-11-0 | Canada | Apr 8, 2017 |
| JC Cottrell (inactive) | | 0-2-0 | United States | Jan 28, 2017 |
| Rashad Coulter (inactive) | Daywalker | 1-3-0 | United States | Nov 24, 2018 |
| Randy Couture (inactive) | The Natural | 16-8-0 | United States | Apr 30, 2011 |
| Ryan Couture (inactive) | | 0-2-0 | United States | Aug 31, 2013 |
| Colby Covington (inactive) | Chaos | 12-5-0 | United States | Dec 14, 2024 |
| Hailey Cowan (inactive) | All Hail | 0-4-0 | United States | Aug 1, 2026 |
| Jeff Cox (inactive) | The Grinder | 0-2-0 | United States | Apr 2, 2008 |
| Nathan Coy (inactive) | Soulforce | 1-2-0 | Unknown | Apr 15, 2017 |
| Andrew Craig (inactive) | Highlight | 3-4-0 | United States | Jul 15, 2015 |
| Paul Craig (inactive) | Bearjew | 9-10-1 (1 NC) | United Kingdom | Sep 6, 2025 |
| Dan Cramer (inactive) | | 1-1-0 | United States | Aug 8, 2009 |
| Alberto Crane (inactive) | | 0-2-0 | United States | Jan 23, 2008 |
| Tim Credeur (inactive) | | 3-2-0 | United States | Jun 4, 2011 |
| Paul Creighton (inactive) | | 0-1-0 | United States | May 10, 2002 |
| Melissa Croden | Scare | 2-1-0 | Canada | Apr 18, 2026 |
| Kevin Croom (inactive) | Crash | 0-3-0 (1 NC) | United States | Apr 16, 2022 |
| Kiefer Crosbie (inactive) | BDK | 0-3-0 | Ireland | Aug 23, 2025 |
| Allen Crowder (inactive) | Pretty Boy | 1-2-0 | United States | Jun 22, 2019 |
| Daron Cruickshank (inactive) | Detroit Superstar | 6-6-0 (1 NC) | United States | Jan 17, 2016 |
| Richard Crunkilton (inactive) | Cleat | 0-1-0 | Unknown | Apr 25, 2003 |
| Jimmy Crute | | 6-4-2 | Australia | Sep 27, 2025 |
| Aalon Cruz (inactive) | | 0-2-0 | United States | Mar 6, 2021 |
| Dominick Cruz (inactive) | The Dominator | 7-3-0 | United States | Aug 13, 2022 |
| Marcio Cruz (inactive) | Pe de Pano | 2-2-0 | Brazil | Dec 30, 2006 |
| Timmy Cuamba | Twilight | 2-3-0 | United States | May 16, 2026 |
| Jay Cucciniello (inactive) | | 0-1-0 | Ireland | Jul 6, 2018 |
| Josh Culibao (inactive) | Kuya | 3-4-1 | Australia | Aug 17, 2024 |
| Zak Cummings (inactive) | | 10-4-0 | Unknown | Apr 15, 2023 |
| Patrick Cummins (inactive) | Durkin | 6-7-0 | Unknown | May 18, 2019 |
| Luke Cummo (inactive) | | 3-4-0 | United States | Aug 9, 2008 |
| AJ Cunningham (inactive) | The Savage | 0-2-0 | United States | Mar 15, 2025 |
| Larry Cureton (inactive) | | 0-2-0 | Unknown | Sep 8, 1995 |
| Jeff Curran (inactive) | Big Frog | 0-3-0 | United States | May 15, 2012 |
| Kailin Curran (inactive) | | 1-6-0 | United States | Nov 25, 2017 |
| Chris Curtis | Action-Man | 6-5-0 (1 NC) | United States | Mar 14, 2026 |
| Ion Cutelaba | The Hulk | 9-11-1 | Moldova | Jun 20, 2026 |