Sorted alphabetically by last name · 2707 fighters
| Name | Nickname | |
|---|---|---|
| RM | Roque Martinez | |
| RM | Rory MacDonald | "Red King" |
| RM | Rory Markham | |
| RS | Rory Singer | "Outburst" |
| RN | Rose Namajunas | "Thug" |
| RS | Rosi Sexton | "The Surgeon" |
| RP | Ross Pearson | "The Real Deal" |
| RP | Ross Pointon | "The Gladiator" |
| RA | Rostem Akman | |
| RP | Rousimar Palhares | "Toquinho" |