Tous les combattants
 | Isaac Vallie-Flagg | 1-3-0 UFC | #4304 |  |
 | Isabela de Padua | 0-1-0 REC | #7091 |  |
 | Isabella de Padua | 0-1-0 UFC | #6365 | |
 | Isai Ramos | 1-1-0 REC | #4546 |  |
 | Isaiah Arechiga | 0-1-0 REC | #6916 | |
 | Isaiah Diggs | 0-1-0 REC | #6038 | |
 | Isaiah Figueroa | 0-1-0 REC | #7402 | |
 | Isaiah Flores | 0-1-0 REC | #7345 | |
 | Isaiah Hokit | 2-0-0 REC | #4265 | |
 | Isaiah Joans | 0-1-0 REC | #7168 | |
 | Isaiah Mahto | #7877 | | |
 | Isaiah Pinson | 3-3-0 REC | #2133 | |
 | Isaiah Skidmore | 0-1-0 REC | #6065 | |
 | Isaiah Watkins | 1-0-0 REC | #676 | |
 | Isaias Simoes | 0-1-0 REC | #7422 | |
 | Isame Ennani | 1-0-0 REC | #7748 |  |
 | Isao Kobayashi | 0-2-0 REC | #4237 |  |
 | Isi Fitikefu | #7603 |  | |
 | Isiah Torres | 1-0-0 REC | #6806 | |
 | Isis Verbeek | 1-1-0 REC | #5499 |  |
 | Iskandar Mamadaliev | 2-1-0 REC | #1753 |  |
 | Islam Aguev | 1-1-0 REC | #1550 |  |
 | Islam Albekov | 1-1-0 REC | #1529 | |
 | Islam Babatov | 0-1-0 REC | #5767 | |
 | Islam Bakharchiev | 1-0-0 REC | #3033 | |