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)