Baseball Squadre che iniziano con O
- Oakland Athletics
- Olmecas de Tabasco
- Oklahoma City Dodgers
- Omaha Storm Chasers
- Oakland Golden Grizzlies
- Oregon State Beavers
- Oregon Ducks
- Ohio Bobcats
- Ohio State Buckeyes
- Old Dominion Monarchs
- Oklahoma Sooners
- Oklahoma State Cowboys
- Orix Buffaloes (Reserves)
- Oral Roberts Golden Eagles
- Olympia Blansko