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- Oakdale Housing Project4
- Oakland University6
- Oenothera2
- Office buildings124
- Office workers2
- Officials and employees30
- Old Newsboys' Goodfellow Fund, Detroit2
- Old State Capitol Market (Detroit, Michigan)2
- Olympia Stadium (Detroit, Michigan)6
- Onagraceae4
- Open and closed shop2
- Opera houses2
- Operations other than war2
- Opium6
- Opium trade6
- Orchestra2
- Organ (Musical instrument)4
- Organ pipes4
- Organic farming2
- Organizations8