K
- Martin Kampmann – (UFC)
- Denis Kang – (PRIDE, Pancrase, K-1, UFC)
- Georgi Karakhanyan – (Bellator)
- Alex Karalexis – (WEC)
- Mark Kerr – (UFC, PRIDE)
- Mamed Khalidov – (ShoXC, KSW)
- Tam Khan – (Cage Rage)
- Sergei Kharitonov – (PRIDE, Strikeforce)
- Amir Khillah
- Minsoo Kim – (K-1)
- Donghyun Kim – (DEEP, Spirit MC, UFC)
- Kevin Knabjian – (Shooto, WEC, Bellator)
- John Kolosci – (IFC)
- Cheick Kongo – (UFC)
- Josh Koscheck – (UFC)
- Anton Kuivanen – (UFC)
- Pascal Krauss – (UFC)
- Mike Kyle – (KOTC, WEC, UFC, Pancrase, Strikeforce)
Read more about this topic: List Of Male Mixed Martial Artists