Frederick IV
Frederick IV may refer to:
- Frederick IV, Duke of Swabia
- Frederick IV, Count of Zollern, Burgrave Friedrich II of Nuremberg
- Frederick IV, Duke of Lorraine
- Frederick IV, Burgrave of Nuremberg
- Frederick IV of Sicily, called "Frederick the Simple"
- Frederick IV, Duke of Austria
- Frederick IV of Oettingen
- Frederick IV, Landgrave of Thuringia
- Frederick IV of Naples
- Frederick IV of Brandenburg
- Frederick IV, Elector Palatine, called "Frederick the Righteous"
- Frederick IV, Duke of Brunswick-Lüneburg
- Frederick IV, Duke of Holstein-Gottorp
- Frederick IV of Denmark
- Frederick IV, Landgrave of Hesse-Homburg
- Frederick IV, Duke of Saxe-Gotha-Altenburg
- Frederick IV, Prince of Salm-Kyrburg, prince of Salm-Kyrburg, Ahaus and Bocholt