Otto III (disambiguation)

• Otto I (disambiguation)
• Otto II (disambiguation)
• Otto III of Carinthia
• Otto III, Count Palatine of Burgundy
• Otto III, Count of Waldeck
• Otto III, Duke of Bavaria
• Otto III, Duke of Pomerania
• Otto III, Duke of Swabia
• Otto III, Holy Roman Emperor
• Otto III, Margrave of Brandenburg
• Otto III, Marquess of Montferrat
• Otto IV (disambiguation)
• Otto V (disambiguation)
• Otto VI
• Otto VII (disambiguation)
• Otto VIII (disambiguation)