Poids Lourds Hommes
 | Joe Pardo | 0-1-0 UFC | #5851 |  |
 | Joe Son | 0-1-0 UFC | #4668 | |
 | Joffie Houlton | 3-2-0 REC | #1608 |  |
 | John Campetella | 0-1-0 UFC | #5176 | |
 | John Lopez | 0-1-0 REC | #5027 | |
 | John Marsh | 0-1-0 UFC | #4846 | |
 | John Matua | 0-1-0 UFC | #4756 | |
 | John Winter | 0-1-0 REC | #7247 |  |
 | John-Olav Einemo | 0-2-0 UFC | #3694 |  |
 | Johnny Rhodes | 2-1-0 UFC | #3841 | |
 | Jon Cunningham | 0-1-0 REC | #7009 | |
 | Jon Hess | 1-0-0 UFC | #5142 | |
 | Jon Jones | 22-1-0, 1NC UFC | #5 | |
 | Jon Madsen | 4-1-0 UFC | #2707 | |
 | Jonathan Wiezorek | 1-0-0 UFC | #6415 | |
 | Jordan Heiderman | 1-2-0 REC | #4789 | |
 | Jordan Johnson | 4-0-0 UFC | #2078 | |
 | Jose Augusto | 4-3-0 REC | #1977 |  |
 | Jose Luiz | #6157 | | |
 | Josh Appelt | 0-1-0 REC | #6722 | |