Poids Lourds Hommes
 | John Marsh | 0-1-0 UFC | #4647 |  |
 | John Matua | 0-1-0 UFC | #4777 | |
 | John Winter | 0-1-0 REC | #7117 |  |
 | John-Olav Einemo | 0-2-0 UFC | #3505 |  |
 | Johnny Rhodes | 2-1-0 UFC | #3643 | |
 | Jon Cunningham | 0-1-0 REC | #6856 | |
 | Jon Hess | 1-0-0 UFC | #4947 | |
 | Jon Jones | 22-1-0, 1NC UFC | #7 | |
 | Jon Madsen | 4-1-0 UFC | #2536 | |
 | Jonathan Wiezorek | 1-0-0 UFC | #6208 | |
 | Jordan Heiderman | 1-2-0 REC | #4688 | |
 | Jordan Johnson | 4-0-0 UFC | #1965 | |
 | Jose Augusto | 4-2-0 REC | #1932 |  |
 | Jose Luiz | #7193 | | |
 | Josh Appelt | 0-1-0 REC | #6418 | |
 | Josh Barnet | 7-3-0 UFC | #1085 | |
 | Josh Copeland | 0-2-0 UFC | #3059 | |
 | Josh Hendricks | 0-1-0 UFC | #5926 | |
 | Josh Hokit | 2-0-0 UFC | #175 | |
 | Josh Parisian | 2-5-0 UFC | #1778 | |