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- Observatories in the Scientific Revolution
- Obsidian in Mesoamerica
- Oceanus
- Ochus
- Oda Nobunaga
- Odin
- Odo of Bayeux
- Odo of West Francia
- Odoacer
- Odysseus
- Odyssey
- Oedipus at Colonus
- Oedipus the King
- Oenone
- Of Plymouth Plantation: Brief Summary & History
- Officers of the Roman Army
- Ögedei Khan
- Ogham
- Oheka Castle
- Old Dongola
- Old Kingdom of Egypt
- Old Testament Pseudepigrapha
- Oldowan Tools
- Olive Branch Petition
- Oliver Cromwell
- Olmec Civilization
- Olmec Colossal Stone Heads
- Olympia
- Olympia Fulvia Morata
- Olympias
- Oman: The Land of Frankincense - Tony Walsh
- Omar Khayyam
- On the Ocean: The Famous Voyage of Pytheas
- On the Pallava Trail in Kanchipuram
- On the Path of Early Christianity in Marseille
- Ono no Komachi
- Opening the Way to India
- Operation Chastise
- Operation Gomorrah
- Oppidum
- Oracle Bones
- Order of the Garter
- Oribasius
- Orichalcum
- Origin of the Sweat Lodge
- Origins of Christian Antisemitism in the Gospels
- Origins of the Haudenosaunee (Iroquois) Confederacy
- Origins of World Agriculture
- Orion
- Orisha
- Orleans Cathedral
- Orontid Dynasty
- Orosius
- Orpheus
- Oshun
- Osiris
- Osman I
- Ostia
- Ostracism
- Ostrogoth
- Oswald of Northumbria
- Otho
- Ottoman Empire
- Our Favourite Ancient History Shops
- Overlooked Athens: 5 Ancient Sites
- Ovid
- Owen Tudor
- Oxus
- Oxus Treasure
- Oyo Empire
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