Poids Mouches Hommes
 | Jack Duffy | 0-1-0 REC | #5567 |  |
 | Jacob Romero | 0-1-0 REC | #6875 | |
 | Jacob Silva | 0-2-0 REC | #6176 | |
 | Jae Hoon Lee | #8008 |  | |
 | Jafel Filho | 3-3-0 UFC | #1299 |  |
 | Jaime Alvarez | 1-0-0 REC | #6310 | |
 | Jaime Lloyd | 1-0-0 REC | #2285 | |
 | Jamal Fayzullaev | 0-1-0 REC | #6472 |  |
 | Jamie Abbott-Bissett | 2-0-0 REC | #3138 |  |
 | Jamshid Tilyaev | #7845 |  | |
 | Jared Braun | 0-2-0 REC | #4244 | |
 | Jarred Brooks | 2-2-0 UFC | #3296 | |
 | Javier Cepeda | 0-1-0 REC | #7046 | |
 | Jawany Scott | 6-2-0 REC | #1192 |  |
 | Jean Matos | 0-1-0 REC | #7339 | |
 | Jean Sevalho | 2-0-0 REC | #1121 | |
 | Jeff Molina | 3-0-0 UFC | #2290 | |
 | Jenel Lausa | 1-3-0 UFC | #3624 |  |
 | Jenilto Matos | 0-2-0 REC | #4430 | |
 | Jeremia Siregar | 0-1-0 REC | #6485 |  |