List of Battles (alphabetical) - O

O

• Battle of Ocana - 1809 - Napoleonic Empire Wars
• Battle of Oenophyta - 457 BC - First Peloponnesian War
• Battle of Okinawa - 1945 - World War II
• Battle of Olpae - 426 BC - Peloponnesian War
• Battle of Omdurman - 1898 - The Mahdist, Anglo-Sudan War
• Battle of Orchomenus - 84 BC - First Mithridatic War
• Battle of Orléans - 1429 - Hundred Years' War - Joan of Arc participated
• Battle of Osankarica - 1943 - World War II
• Battle of Otterburn - 1388 - Scottish/English border dispute
• Battle of Oudenarde - 1708 - War of the Spanish Succession