Poids Plumes Hommes
 | Isaac Thomson | 0-1-0 UFC | #1318 |  |
 | Isai Ramos | 1-1-0 REC | #4566 |  |
 | Isaiah Arechiga | 0-1-0 REC | #6932 |  |
 | Isaiah Diggs | 0-1-0 REC | #6084 | |
 | Isaiah Hokit | 2-0-0 REC | #4273 | |
 | Isame Ennani | 1-0-0 REC | #7755 |  |
 | Islam Babatov | 0-1-0 REC | #5766 |  |
| Islam Edaev | #7641 | | |
 | Islam Isaev | 1-0-0 REC | #2334 | |
 | Islam Meshev | 0-2-0 REC | #4303 | |
 | Islam Omarov | 2-0-0 REC | #1677 | |
 | Islam Reda | 5-0-0 REC | #1106 |  |
 | Islam Taisumov | 1-1-0 REC | #1180 | |
 | Ismail Kelemetov | 1-0-0 REC | #6203 | |
 | Issa Hosokawa | #8025 |  | |
 | Issei Tamura | 1-2-0 UFC | #4282 | |
 | Itay Tratner | 0-1-0 REC | #7243 |  |
 | Ivan Tena | 0-1-0 REC | #7609 | |
 | Izzeddine Al Derbani | 0-1-0 REC | #4551 |  |
 | Jack Claffey | 1-1-0 REC | #6323 |  |