R
- Jordan Radev – (UFC)
- Hector Ramirez – (KOTC, UFC)
- Kevin Randleman – (PRIDE, UFC)
- Vitor Ribeiro – (Cage Rage, K-1 HERO'S, Shooto, WFA,
- Aaron Riley (UFC, DREAM)
- Joe Riggs – (K-1, UFC, WEC, Strikeforce, BFC)
- Nick Ring – (Bellator, DEEP, UFC)
- Pedro Rizzo – (PRIDE, UFC)
- Colin Robinson – (UFC)
- Ricco Rodriguez – (KOTC, PRIDE, UFC, WEC, WFA)
- Jason Reinhardt – (UFC)
- George Roop – (WEC, UFC)
- João Roque – (DEEP, Shooto, UFC)
- Kristian Rothaermel – (UFC)
- Ben Rothwell – (IFL, Affliction, UFC)
- Chad "Akebono" Rowan – (K-1 HERO'S)
- Mauricio "Shogun" Rua – (PRIDE, UFC)
- Murilo "Ninja" Rua – (Cage Rage, Elite XC, PRIDE, DREAM)
- Marco Ruas – (IFL, PRIDE, Shooto, UFC)
- Rodrigo Ruas – (IFL, UFC)
- Gabe Ruediger – (WEC, IFC, UFC)
- Mikko Rupponen – (Fight Festival)
- Bas Rutten – (Pancrase, UFC, WFA)
Read more about this topic: List Of Male Mixed Martial Artists