Sorted alphabetically by last name · 2769 fighters
| Name | Nickname | |
|---|---|---|
| KS | Krzysztof Soszynski | "The Polish Experiment" |
| KH | Kuniyoshi Hironaka | |
| KH | Kurt Holobaugh | "The Hurt" |
| KP | Kurt Pellegrino | "Batman" |
| KC | Kurtis Campbell | "The Pink Panther" |
| KH | Kwan Ho Kwak | |
| KB | Kyle Bochniak | "Killer B" |
| KB |
| Kyle Bradley |
| KD | Kyle Daukaus |
| KK | Kyle Kingsbury | "Kingsbu" |