Otto II (disambiguation)
- Otto I (disambiguation)
- Otto II (bishop of Freising)
- Otto II of Andechs and Merania
- Otto II of Hungary
- Otto II, Count Palatine of Mosbach-Neumarkt
- Otto II, Count of Burgundy
- Otto II, Count of Chiny
- Otto II, Count of Duras
- Otto II, Count of Guelders
- Otto II, Count of Habsburg
- Otto II, Count of Rietberg
- Otto II, Count of Scheyern
- Otto II, Count of Waldeck
- Otto II, Count of Zutphen
- Otto II, Duke of Bavaria
- Otto II, Duke of Brunswick-Göttingen
- Otto II, Duke of Brunswick-Harburg
- Otto II, Duke of Brunswick-Lüneburg
- Otto II, Duke of Brunswick-Osterode
- Otto II, Duke of Pomerania
- Otto II, Duke of Saxony
- Otto II, Duke of Swabia
- Otto II, Holy Roman Emperor
- Otto II, Margrave of Brandenburg
- Otto II, Margrave of Meissen
- Otto II, Marquess of Montferrat
- Otto II, Prince of Anhalt-Aschersleben
- Otto III (disambiguation)
- Otto IV (disambiguation)
- Otto VII (disambiguation)
- Otto VIII (disambiguation)
- Otto fuel II