Frederick III
- Emperor Frederick III (disambiguation)
- Frederick III of Brandenburg
- Frederick III of Denmark
- Frederick III of Germany
- Frederick III of Sicily
- Frederick III the Simple
- Frederick III, Count of Moers
- Frederick III, Count of Veldenz
- Frederick III, Duke of Austria
- Frederick III, Duke of Brunswick-Lüneburg
- Frederick III, Duke of Holstein-Gottorp
- Frederick III, Duke of Legnica
- Frederick III, Duke of Lorraine
- Frederick III, Duke of Saxe-Gotha-Altenburg
- Frederick III, Duke of Swabia
- Frederick III, Duke of Upper Lorraine
- Frederick III, Duke of Wurttemberg
- Frederick III, Elector Palatine
- Frederick III, Elector of Saxony
- Frederick III, Fuerst of Salm-Kyrburg
- Frederick III, German Emperor
- Frederick III, Holy Roman Emperor
- Frederick III, Landgrave of Hesse-Homburg
- Frederick III, Landgrave of Thuringia
- Frederick III, Margrave of Baden-Baden
- Frederick III, Margrave of Brandenburg-Ansbach
- Frederick III, Margrave of Meissen
- Frederick Philipse III
- Frederick the Wise
- Friedrich III, Burgrave of Nuremberg
- Friedrich III, Landgrave of Hesse-Cassel