King Frederick

King Frederick or King Frederik may refer to:


 * Frederick I of Denmark
 * Frederick II of Denmark
 * Frederick III of Denmark
 * Frederick IV of Denmark
 * Frederick V of Denmark
 * Frederick VI of Denmark
 * Frederick VII of Denmark
 * Frederik VIII of Denmark
 * Frederik IX of Denmark
 * Frederik X of Denmark
 * Frederick I of Sweden
 * Frederick I of Prussia, previously Frederick III, Elector of Brandenburg
 * Frederick II of Prussia, Frederick the Great
 * Frederick III, German Emperor, also King Frederick III of Prussia
 * Frederick I of Württemberg (1754–1816)
 * Frederick of Naples
 * Frederick I, Holy Roman Emperor, also King of Italy
 * Frederick II, Holy Roman Emperor, also King Frederick I of Sicily
 * Frederick III, Holy Roman Emperor, also King of Italy
 * Frederick III of Sicily
 * Frederick the Simple
 * Frederick the Fair
 * Frederick V of the Palatinate

In addition, a number of kings of Prussia were named Frederick William:
 * Frederick William I of Prussia (1688–1740)
 * Frederick William II of Prussia (1744–1797)
 * Frederick William III of Prussia (1770–1840)
 * Frederick William IV of Prussia (1795–1861)

In addition, a number of kings of Saxony were named Frederick Augustus:
 * Frederick Augustus I of Saxony (1750–1827)
 * Frederick Augustus II of Saxony (1797–1854)
 * Frederick Augustus III of Saxony (1865–1932)