Groups starting with: 'O'
- Amazons (aka: Oiorpata)
- Locrians (aka: Epicnemidian Locrians, Opuntian Locris, Hypocnemidian Locrians, Ozolian Locris)
- Oceanids
- Olizonians
- Oeneadae
- Olizonians vs Troy
- Olympians (aka: The Twelve Gods, Dodekatheon)
- Olympians of Achaea
- Orchomenians
- Orchomenians vs Troy
- Ormenians
- Ormenians vs Troy
- Oropians
- Oxydracae
- Odrysians
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