Sorted alphabetically by last name · 2767 fighters
| Name | Nickname | |
|---|---|---|
| SP | Sergio Pettis | |
| SS | Serhiy Sidey | |
| SB | Seth Baczynski | "The Polish Pistola" |
| SP | Seth Petruzelli | "The Silverback" |
| SC | SeungGuk Choi | |
| SC | SeungWoo Choi | "Sting" |
| SB | Shamar Bailey | |
| SA |
| "Abrek" |
| SG | Shamil Gamzatov |
| SG | Shamil Gaziev |