Combattants Japon
| 51 |  | Jinnosuke Kashimura | 2-2-0 REC | #918 |  |
| 52 |  | Jo Arai | 0-2-0 REC | #4470 | |
| 53 |  | Joe Hiramoto | 2-1-0 REC | #599 | |
| 54 |  | Joji Goto | 3-1-0 REC | #1190 | |
| 55 |  | Juntarou Ushiku | 0-1-0 REC | #7300 | |
| 56 |  | Junya Hibino | 0-1-0 REC | #7203 | |
| 57 |  | Juri Ohara | #7601 | | |
| 58 |  | Jutaro Nakao | 1-1-0 UFC | #4825 | |
| 59 |  | Kai Asakura | 1-2-0 UFC | #163 | |
| 60 |  | Kai Yoshida | 0-1-0 REC | #4964 | |
| 61 |  | Kaisei Kuroi | 0-1-0 REC | #6675 | |
| 62 |  | Kaito Oda | 0-1-0 REC | #6034 | |
| 63 |  | Kana Watanabe | 3-4-0 REC | #2523 | |
| 64 |  | Kanako Murata | 1-2-0 UFC | #4197 | |
| 65 |  | Kanna Asakura | 0-1-0 REC | #6575 | |
| 66 |  | Katsuhisa Fujii | 1-1-0 UFC | #5414 | |
| 67 |  | Katsunori Kikuno | 2-3-0 UFC | #3347 | |
| 68 |  | Katsuyoshi Sasaki | 0-1-0 REC | #7090 | |
| 69 |  | Kazuhiro Nakamura | 0-2-0 UFC | #4823 | |
| 70 |  | Kazuki Aimoto | #7755 | | |
| 71 |  | Kazuki Tokudome | 1-3-0 UFC | #3915 | |
| 72 |  | Kazuma Maruyama | 0-1-0 REC | #6630 | |
| 73 |  | Kazumasa Majima | 2-1-0 REC | #638 | |
| 74 |  | Kazuo Takahashi | 1-0-0 UFC | #5106 | |
| 75 |  | Kazushi Sakuraba | 1-0-0, 1NC UFC | #3797 | |