Sorted alphabetically by last name · 2769 fighters
| Name | Nickname | |
|---|---|---|
| JP | Julio Paulino | "The Dominican Demon" |
| JW | Julius Walker | "Juice Box" |
| JT | Jumabieke Tuerxun | "The Wild Wolf" |
| JP | JunYong Park | "The Iron Turtle" |
| JB | Junie Browning | |
| JA | Junior Albini | "Baby" |
| JA | Junior Assuncao | |
| JD |
| Junior Dos Santos |
| "Cigano" |
| JT | Junior Tafa | "The Juggernaut" |
| JF | Jussier Formiga |