Poids Légers Hommes
 | Italo Ribeiro | 0-2-0 REC | #5730 |  |
 | Ivan Buchinger | 8-3-0 REC | #888 |  |
 | Ivan Klevets | 1-2-0 REC | #2333 |  |
 | Ivan Yashmanov | 0-1-0 REC | #8119 |  |
 | J.C. Cottrell | 0-2-0 UFC | #5388 |  |
 | Jaad Sekkal | 1-0-0 REC | #2075 |  |
 | Jack Becker | 0-1-0 REC | #5003 |  |
 | Jack Sheehan | #7944 | | |
 | Jacob Bohn | 0-1-0 REC | #6924 | |
| Jacob Hill | 0-1-0 REC | #6901 | |
 | Jacob Lagoa | 1-0-0 REC | #1688 | |
 | Jacob Rosales | 1-3-0 REC | #2549 | |
 | Jacobi Jones | 2-3-0 REC | #2642 | |
 | Jae Hyun Park | 1-2-0 REC | #2589 |  |
 | Jai Herbert | 4-5-1 UFC | #484 |  |
 | Jairo Pacheco | 0-2-0 REC | #6154 | |
 | Jake Bower | 0-1-0 REC | #6634 | |
 | Jake Hixenbaugh | 0-2-0 REC | #4487 | |
 | Jake Lindsey | 0-3-0 UFC | #4714 | |
 | Jakub Bahnik | 5-1-0, 1NC REC | #2957 |  |