Poids Mouches Hommes
 | Jenilto Matos | 0-2-0 REC | #4561 |  |
 | Jeremia Siregar | 0-1-0 REC | #6596 |  |
 | Jerome Rivera | 0-4-0 UFC | #3472 |  |
 | Jesse Martinelli | 0-1-0 REC | #7091 | |
 | Jesus Aguilar | 4-3-0 UFC | #1277 |  |
 | Jhonata Silva | 1-1-0 REC | #6117 | |
 | Jhonatan Oliveira | 1-2-0 REC | #3274 | |
 | Jimi Natividad | 0-1-0 REC | #6500 |  |
 | Jimmy Flick | 2-4-0 UFC | #2395 | |
 | Jin Tanaka | 1-0-0 REC | #1743 |  |
 | Jiniushiyue | 3-2-0 REC | #1516 |  |
 | Jo Arai | 0-2-0 REC | #4698 | |
 | Joao Elias | 0-1-0 REC | #6481 | |
 | Joao Victor Melo | 0-1-0 REC | #6632 | |
 | Joby Sanchez | 1-4-0 UFC | #3214 | |
 | Joe Fields | 6-0-0 REC | #728 |  |
 | Joe Hiramoto | 2-1-0 REC | #1043 | |
 | John Dave Almanza | 0-1-0 REC | #5992 | |
 | John Moraga | 8-6-0 UFC | #1276 | |
 | Jon delos Reyes | 1-3-0 UFC | #3832 |  |