Otto IV (disambiguation)
# Otto IV (disambiguation)

Otto IV may refer to:

* Otto IV, Count of Wittelsbach (c. 1083 – 1156)
* Otto IV, Holy Roman Emperor (1175–1218)
* Otto IV, Count of Ravensberg (c.  1276–1328)
* Otto IV, Count of Burgundy (1248–1302)
* Otto IV, Margrave of Brandenburg-Stendal (c. 1238 – 1308 or 1309)
* Otto IV, the Merry (1301–1339), Duke of Austria
* Otto IV, Duke of Lower Bavaria (1307–1334)
* Otto IV, Prince of Anhalt-Bernburg (d. 1415)
* Otto IV, Duke of Brunswick-Lüneburg or Otto the Lame (d. 1446), Prince of Lüneburg
* Otto IV, Count of Waldeck (c. 1440–1494), of Landau
* Otto IV, Count of Rietberg (d. 1553)
* Otto IV of Schaumburg (1517–1576)
