Sorted alphabetically by last name · 2769 fighters
| Name | Nickname | |
|---|---|---|
| KS | Kamal Shalorus | "Prince of Persia" |
| KU | Kamaru Usman | "The Nigerian Nightmare" |
| KK | Kamuela Kirk | "The Jawaiian" |
| KM | Kanako Murata | |
| KG | Karine Gevorgyan | "The Princess" |
| KS | Karine Silva | "Killer" |
| KR | Karl Roberson | "Baby K" |
| KW |
| Karl Williams |
| KV | Karlos Vemola |
| KP | Karo Parisyan | "The Heat" |