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- Oil & Gas Belt League
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- Okanagan Valley International
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- Okanogan Valley League
- Oklahoma-Arkansas-Kansas League
- Oklahoma-Kansas League
- Oklahoma-Kansas League-1915
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- Oklahoma-Kansas League 1919
- Oklahoma-Kansas Sunday League
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- Old Chief League
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- Ollie Bejma
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- Olympia League
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- Omar Vizquel
- On-base percentage
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- Oneonta State Red Dragons
- Ontario-Yates League
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- Oshawa City & District Intermediate League
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- P. J. Conlon
- P. N. A. League
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- P. R. R. Motive League
- PETCO Park
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- Palmetto Textile League - Laurens Loop
- Panama City League
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- Panhandle East League
- Panhandle League
- Panhandle League (NE)
- Pants Rowland
- Paris City League
- Park Pirates
- Parker Textile League
- Pasco Highlands League
- Passaic-Bergen League
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