List of Male Mixed Martial Artists - O

O

• Jake O'Brien – (UFC)
• Naoya Ogawa – (PRIDE)
• Sean O'Haire – (K-1 HERO'S, PRIDE)
• Yushin Okami – (K-1 HERO'S, Pancrase, PRIDE, UFC)
• Charles Oliveira – (Ring of Combat, UFC)
• Bobby Ologun – (K-1)
• Andy Ologun – (K-1, DREAM)
• Michihiro Omigawa – (Cage Rage, DEEP, PRIDE)
• Tito Ortiz – (UFC)
• Alexander Otsuka – (KOTC, PRIDE)
• Alistair Overeem – (K-1, MFC, PRIDE, Strikeforce, DREAM)
• Valentijn Overeem – (K-1 HERO'S, MFC, PRIDE, WFA)
• Shungo Oyama – (K-1 HERO'S, KOTC, PRIDE)