Sorted alphabetically by last name · 2715 fighters
| Name | Nickname | |
|---|---|---|
| KM | Kris Moutinho | |
| KR | Kristian Rothaermel | |
| KM | Kristof Midoux | "The Hurricane" |
| KG | Kron Gracie | |
| KJ | Krzysztof Jotko | |
| KS | Krzysztof Soszynski | "The Polish Experiment" |
| KH | Kuniyoshi Hironaka | |
| KH | Kurt Holobaugh | "The Hurt" |
| KP | Kurt Pellegrino | "Batman" |
| KC | Kurtis Campbell | "The Pink Panther" |