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- Jeremy Jackson – (KOTC, UFC)
- Quinton "Rampage" Jackson – (KOTC, PRIDE, UFC, WFA)
- Jaime Jara – (EliteXC, KOTC)
- Keith Jardine – (KOTC, MFC, Pancrase, UFC)
- Antoine Jaoude – (IFL)
- Steve Jennum – (UFC)
- Ryan Jensen – (UFC)
- Chansung Jung – (UFC, WEC)
- DaMarques Johnson – (UFC)
- Jon Jones – (UFC)
- Nathan Jones – (PRIDE FC)
- Kevin Jordan – (UFC)
- Jeff Joslin – (TKO, UFC)
Read more about this topic: List Of Male Mixed Martial Artists