Poids Mi-Moyens Hommes
 | Joe Merritt | 0-1-0 UFC | #5442 |  |
 | Joe Middleton | 3-1-0 REC | #2634 |  |
 | Joel Alvarez | 8-2-0 UFC | #301 |  |
 | Joel dos Santos | 0-2-0 REC | #4989 |  |
 | Joel Salviano | 0-1-0 REC | #5294 | |
 | Joey Davis | 0-1-0 REC | #6207 | |
 | Joey Hart | 3-3-0 REC | #1896 | |
 | Johan Rodriguez | 1-1-0 REC | #5118 |  |
 | John Adajar | 0-1-0 REC | #5362 |  |
 | John Caldone | 1-0-0 REC | #6344 | |
 | John Caseneuil | 1-2-0 REC | #3417 |  |
 | John Hathaway | 7-2-0 UFC | #1306 | |
 | John Howard | 7-7-0 UFC | #979 | |
 | John Maguire | 2-3-0 UFC | #3423 | |
 | John Palaiologos | 1-4-0 REC | #3671 |  |
 | Joilton Lutterbach | 0-3-0 REC | #3566 | |
 | Jon Koppenhaver | 1-1-0 UFC | #3053 | |
 | Jon Manley | 0-1-0 UFC | #6603 | |
 | Jon Tabarez | 0-1-0 REC | #6074 | |
 | Jon Tuck | 4-5-0 UFC | #2302 |  |