Frederick IV

Frederick IV may refer to:


 * Frederick IV, Duke of Swabia (1145–1167)
 * Frederick IV, Count of Zollern (c. 1188–c. 1255), Burgrave Friedrich II of Nuremberg
 * Frederick IV, Duke of Lorraine (1282–1329)
 * Frederick IV, Burgrave of Nuremberg (1287–1332)
 * Frederick IV of Sicily (1341–1377), called "Frederick the Simple"
 * Frederick IV, Duke of Austria (1382–1439)
 * Frederick IV of Oettingen (died 1415)
 * Frederick IV, Landgrave of Thuringia (died 1440)
 * Frederick IV of Naples (1452–1504)
 * Frederick IV of Brandenburg (1530–1552)
 * Frederick IV, Elector Palatine (1574–1610), called "Frederick the Righteous"
 * Frederick IV, Duke of Brunswick-Lüneburg (1574–1648)
 * Frederick IV, Duke of Holstein-Gottorp (1671–1702)
 * Frederick IV of Denmark (1671–1730)
 * Frederick IV, Landgrave of Hesse-Homburg (1724–1751)
 * Frederick IV, Duke of Saxe-Gotha-Altenburg (1774–1825)
 * Frederick IV, Prince of Salm-Kyrburg (1789–1859), prince of Salm-Kyrburg, Ahaus and Bocholt