Sorted alphabetically by last name · 2775 fighters
| Name | Nickname | |
|---|---|---|
| RA | Royce Alger | |
| RG | Royce Gracie | |
| RW | Royston Wee | |
| RP | Ruan Potts | "Fangzz" |
| RM | Rudyard Moncayo | |
| RM | Ruslan Magomedov | "Leopard" |
| RD | Russell Doane | |
| RK | Rustam Khabilov |
| "Tiger" |
| RB | Ryan Bader | "Darth" |
| RB | Ryan Benoit | "Baby Face" |