Otto IV (disambiguation)

• Otto I (disambiguation)
• Otto II (disambiguation)
• Otto III (disambiguation)
• Otto IV of Schaumburg
• Otto IV, Count of Burgundy
• Otto IV, Count of Ravensberg
• Otto IV, Count of Rietberg
• Otto IV, Count of Waldeck
• Otto IV, Count of Wittelsbach
• Otto IV, Duke of Brunswick-Lüneburg
• Otto IV, Duke of Lower Bavaria
• Otto IV, Holy Roman Emperor
• Otto IV, Margrave of Brandenburg-Stendal
• Otto IV, Prince of Anhalt-Bernburg
• Otto IV, the Merry
• Otto V (disambiguation)
• Otto VI
• Otto VII (disambiguation)
• Otto VIII (disambiguation)