Poids Mi-Moyens Hommes
 | Joseilton Santos | 1-1-0 REC | #1914 |  |
 | Josenaldo Silva | 0-1-0 REC | #7162 | |
 | Joseph Luciano | 1-2-0 REC | #3411 |  |
 | Josh Burkman | 6-12-0, 1NC UFC | #1729 |  |
 | Josh Koscheck | 15-10-0 UFC | #276 | |
 | Josh Neer | 6-9-0 UFC | #1737 | |
 | Josh Quinlan | 1-3-0 UFC | #3131 | |
 | Josh Rafferty | 0-1-0 UFC | #5663 | |
 | Josh Stuart | 0-1-0 UFC | #5523 | |
 | Joshua Nakagawa | 0-1-0 REC | #7144 | |
 | Joshua Onwordi | 1-2-0 REC | #3412 |  |
 | Josiah Harrell | 0-1-0 UFC | #709 | |
 | Jozef Wittner | 1-2-0 REC | #3630 |  |
 | Juan Manuel Suarez | 0-2-0 REC | #4691 |  |
 | Julien Gazagnaire | 1-0-0 REC | #1596 |  |
 | Junie Browning | 1-1-0 UFC | #3940 | |
 | Junior Hernandez | 2-0-1 REC | #1454 |  |
 | Justin Burlinson | 3-1-0 REC | #2112 | |
 | Justin Edwards | 2-5-0 UFC | #3056 | |
 | Jutaro Nakao | 1-1-0 UFC | #4567 |  |