Combattants Brésil
| 501 |  | Junior Orgulho | 0-1-0 REC | #6652 |  |
| 502 |  | Juscelino Pantoja | 0-1-0 REC | #6056 | |
| 503 |  | Jussier da Silva | 9-7-0 UFC | #968 | |
| 504 |  | Kaik Brito | 5-3-0 REC | #355 | |
| 505 |  | Kaique Modesto | 0-1-0 REC | #7186 | |
| 506 |  | Kalindra Faria | 0-3-0 UFC | #3438 | |
| 507 |  | Karine Silva | 5-2-0 UFC | #341 | |
| 508 |  | Karol Rosa | 8-4-0 UFC | #219 | |
| 509 |  | Karol Silva | 0-1-0 REC | #5245 | |
| 510 |  | Karoline Martins | 0-1-0 REC | #7100 | |
| 511 |  | Kaua Fernandes | 0-1-0 REC | #6666 | |
| 512 |  | Kauan Leopoldina | 0-1-0 REC | #5322 | |
| 513 |  | Kaue Fernandes | 3-1-0 UFC | #859 | |
| 514 |  | Kaue Vaz | 0-1-0 REC | #4449 | |
| 515 |  | Kaynan Kruschewsky | 0-2-0 UFC | #3773 | |
| 516 |  | Kelly Ottoni | 0-1-0 REC | #7036 | |
| 517 |  | Kerisson Leal | 0-2-0 REC | #6825 | |
| 518 |  | Ketlen Souza | 3-3-0 UFC | #757 | |
| 519 |  | Ketlen Vieira | 9-5-0 UFC | #137 | |
| 520 |  | Kevin Christian | 0-1-0 UFC | #2712 | |
| 521 |  | Keweny Lopes | 1-3-0 REC | #2853 | |
| 522 |  | Killys Mota | 3-1-0 REC | #3458 | |
| 523 |  | Kleber Koike Erbst | 2-3-0 REC | #1188 | |
| 524 |  | Kleber Silva | 2-3-0 REC | #3333 | |
| 525 |  | Kleberson Sousa | 0-1-0 REC | #6132 | |