Poids Mouches Hommes
 | Jean Matos | 0-1-0 REC | #7544 |  |
 | Jean Sevalho | 2-0-0 REC | #1632 | |
 | Jeff Molina | 3-0-0 UFC | #2275 |  |
 | Jenel Lausa | 1-3-0 UFC | #3827 |  |
 | Jenilto Matos | 0-2-0 REC | #4739 | |
 | Jeremia Siregar | 0-1-0 REC | #6603 |  |
 | Jerome Rivera | 0-4-0 UFC | #3568 | |
 | Jesse Martinelli | 0-1-0 REC | #7224 | |
 | Jesus Aguilar | 4-3-0 UFC | #1358 |  |
 | Jhonata Silva | 1-1-0 REC | #6035 | |
 | Jhonatan Oliveira | 1-2-0 REC | #3373 | |
 | Jimi Natividad | 0-1-0 REC | #6824 | |
 | Jimmy Flick | 2-4-0 UFC | #2428 | |
 | Jin Tanaka | 1-0-0 REC | #1992 |  |
 | Jiniushiyue | 3-2-0 REC | #1639 |  |
 | Jo Arai | 0-2-0 REC | #4758 | |
 | Joao Elias | 0-1-0 REC | #6682 | |
 | Joao Victor Melo | 0-1-0 REC | #6769 | |
 | Joby Sanchez | 1-4-0 UFC | #3287 | |
 | Joe Fields | 6-0-0 REC | #907 |  |