Poids Plumes Hommes
 | Isaiah Arechiga | 0-1-0 REC | #6398 |  |
 | Isaiah Diggs | 0-1-0 REC | #5328 | |
 | Isaiah Hokit | 2-0-0 REC | #4065 | |
 | Isame Ennani | 1-0-0 REC | #7468 |  |
 | Isao Kobayashi | 0-1-0 REC | #6104 |  |
 | Islam Babatov | 0-1-0 REC | #5264 |  |
| Islam Edaev | #7181 | | |
 | Islam Isaev | 1-0-0 REC | #1526 | |
 | Islam Meshev | 0-2-0 REC | #3738 | |
 | Islam Omarov | 2-0-0 REC | #752 | |
 | Islam Reda | 5-0-0 REC | #501 |  |
 | Ismail Kelemetov | 1-0-0 REC | #5846 | |
 | Issei Tamura | 1-2-0 UFC | #3954 | |
 | Itay Tratner | 0-1-0 REC | #6751 |  |
 | Ivan Tena | 0-1-0 REC | #7061 | |
 | Izzeddine Al Derbani | 0-1-0 REC | #4361 |  |
 | Jack Claffey | 1-1-0 REC | #5830 |  |
 | Jack Jenkins | 4-2-0 UFC | #1011 |  |
 | Jack Maguire | 1-0-0 REC | #6031 |  |
 | Jack Shore | 6-3-0 UFC | #1407 |  |