Poids Plumes Hommes
 | Isaac Thomson | 0-1-0 UFC | #1063 |  |
 | Isai Ramos | 1-1-0 REC | #4494 |  |
 | Isaiah Arechiga | 0-1-0 REC | #6652 |  |
 | Isaiah Diggs | 0-1-0 REC | #5629 | |
 | Isaiah Hokit | 2-0-0 REC | #4114 | |
 | Isame Ennani | 1-0-0 REC | #7482 |  |
 | Isao Kobayashi | 0-1-0 REC | #6385 |  |
 | Islam Babatov | 0-1-0 REC | #5579 |  |
| Islam Edaev | #7407 | | |
 | Islam Isaev | 1-0-0 REC | #1888 | |
 | Islam Meshev | 0-2-0 REC | #4015 | |
 | Islam Omarov | 2-0-0 REC | #1149 | |
 | Islam Reda | 5-0-0 REC | #799 |  |
 | Islam Taisumov | 1-1-0 REC | #602 | |
 | Ismail Kelemetov | 1-0-0 REC | #6017 | |
 | Issei Tamura | 1-2-0 UFC | #4127 | |
 | Itay Tratner | 0-1-0 REC | #6950 |  |
 | Ivan Tena | 0-1-0 REC | #7210 | |
 | Izzeddine Al Derbani | 0-1-0 REC | #4534 |  |
 | Jack Claffey | 1-1-0 REC | #6015 |  |