- O'Donnell, Simon
- O'Shields, Larry
- Obed, Elisha
- Ocasio, Angel Luis
- Ocasio, Jonathon
- Odem, David
- Odem, Glen
- Olajide, Michael
- Oliveira, Ray
- Oliver , Mike
- Oliver, Mike
- Olivo, Efren
- Olvera, Rafael
- Omar, Pittman
- Onyango, Joshua
- Opher, Manuel
- Organtini, Chris
- Ornels, Enrique
- Ortega, Joey
- Ortega, Pedro
- Ortiz, Nick
- Ortiz, rickey
- Ortiz,, George
- Oshana, Anwar
- Osorio, Roger
- Otero, Enrique
- Ottah, Anthony
- Ottke , Sven
- Ottke, Sven
- Ouali, Said
- Ouma, Kassim
- Outlaw, Sidney
- Owens, Jerry
- Owens, Leroy
- Owens, Lou
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