Poids Mouches Hommes
 | Jerome Rivera | 0-4-0 UFC | #3610 |  |
 | Jesse Martinelli | #7475 | | |
 | Jesus Aguilar | 4-3-0 UFC | #1488 |  |
 | Jhonata Silva | #6251 |  | |
 | Jhonatan Oliveira | 3-4-0 MMA | #3509 | |
 | Jimi Natividad | #7151 |  | |
 | Jimmy Flick | 2-4-0 UFC | #2500 | |
 | Jin Tanaka | #2244 |  | |
 | Jiniushiyue | 17-4-0 MMA | #1812 |  |
 | Jo Arai | #4926 | | |
 | Joao Elias | #6921 | | |
 | Joao Victor Melo | #6810 | | |
 | Joby Sanchez | 1-4-0 UFC | #3356 | |
 | Joe Fields | 7-0-0 MMA | #1130 |  |
 | Joe Hiramoto | #697 | | |
 | John Dave Almanza | #6434 | | |
 | John Moraga | 8-6-0 UFC | #1319 | |
 | Jon delos Reyes | 1-3-0 UFC | #4100 |  |
 | Jonny Touma | #4777 |  | |
 | Jordan Burkholder | #3669 | |