| Fighter | Record | Last Bout |
|---|---|---|
| Kerry Schall | 24-13-0 (1 NC) | 2005-11-05 |
| Ketlen Souza | 17-6-0 | 2026-06-06 |
| Ketlen Vieira | 16-5-0 | 2026-05-16 |
| Kevin Aguilar | 17-5-0 | 2021-05-15 |
| Kevin Borjas | 11-6-0 | 2026-08-29 |
| Kevin Burns | 12-7-0 | 2009-12-12 |
| Kevin Casey | 9-5-2 (2 NC) | 2016-08-27 |
| Kevin Christian | 9-4-0 | 2026-05-02 |
| Kevin Croom | 21-15-0 (1 NC) | 2022-04-16 |
| Kevin Ferguson | 5-2-0 (1 NC) | 2010-05-08 |
| Kevin Holland | 29-15-0 (1 NC) | 2026-04-11 |
| Kevin Jackson | 4-2-0 | 1998-03-13 |
| Kevin Jordan | 11-9-0 | 2005-11-19 |
| Kevin Jousset | 10-4-0 | 2025-02-08 |
| Kevin Lee | 18-8-0 | 2023-07-01 |
| Kevin Natividad | 9-4-0 | 2022-11-19 |
| Kevin Randleman | 17-16-0 | 2002-01-11 |
| Kevin Rosier | 2-6-0 | 1994-12-16 |
| Kevin Vallejos | 18-1-0 | 2026-03-14 |
| Khabib Nurmagomedov | 29-0-0 | 2020-10-24 |
| Khadis Ibragimov | 8-4-0 | 2020-09-26 |
| Khalid Murtazaliev | 14-2-0 | 2018-09-15 |
| Khalid Taha | 13-5-0 (1 NC) | 2022-09-03 |
| Khalil Rountree Jr. | 15-7-0 (1 NC) | 2025-10-04 |
| Khama Worthy | 16-9-0 | 2021-10-23 |
| Khamzat Chimaev | 15-1-0 | 2026-05-09 |
| Khaos Williams | 16-5-0 | 2026-10-03 |
| Khusein Askhabov | 23-1-0 | 2023-02-18 |
| Kiefer Crosbie | 10-6-0 | 2025-08-23 |
| Kiichi Kunimoto | 18-7-2 (1 NC) | 2017-06-10 |
| Kimo Leopoldo | 10-7-1 | 2004-06-19 |
| King Green | 36-17-1 (1 NC) | 2026-10-03 |
| Kiru Sahota | 12-3-0 | 2024-11-23 |
| Kit Cope | 6-7-0 | 2005-11-05 |
| KJ Noons | 13-9-0 (1 NC) | 2016-02-06 |
| Klaudia Sygula | 8-3-0 | 2026-09-05 |
| Kleydson Rodrigues | 8-4-0 | 2024-05-18 |
| Klidson Abreu | 15-4-0 (1 NC) | 2020-05-30 |
| Kody Steele | 8-1-0 | 2026-05-02 |
| Koji Kitao | 1-2-0 | 1996-05-17 |
| Koji Oishi | 25-10-10 | 2005-06-04 |
| Konstantin Erokhin | 9-3-0 | 2015-12-11 |
| Kris McCray | 8-5-0 | 2011-03-26 |
| Kris Moutinho | 14-8-0 | 2026-02-28 |
| Kristian Rothaermel | 4-3-0 | 2006-06-28 |
| Kristof Midoux | 6-10-0 | 2006-08-17 |
| Kron Gracie | 5-3-0 | 2024-12-07 |
| Krzysztof Jotko | 24-6-0 | 2022-10-01 |
| Krzysztof Soszynski | 26-12-1 | 2011-12-10 |
| Kuniyoshi Hironaka | 23-9-0 | 2008-04-19 |