Frederick may refer to:
People
Frederick (given name), the name
Nobility
Anhalt-Harzgerode
Frederick, Prince of Anhalt-Harzgerode (1613–1670)
Austria
Frederick I, Duke of Austria (Babenberg), Duke of Austria from 1195 to 1198
Frederick II, Duke of Austria (1219–1246), last Duke of Austria from the Babenberg dynasty Frederick the Fair (Frederick I of Austria (Habsburg), 1286–1330), Duke of Austria and King of the Romans
Baden
Frederick I, Grand Duke of Baden (1826–1907), Grand Duke of Baden
Frederick II, Grand Duke of Baden (1857–1928), Grand Duke of Baden
Bohemia
Frederick, Duke of Bohemia (died 1189), Duke of Olomouc and Bohemia
Britain
Frederick, Prince of Wales (1707–1751), eldest son of King George II of Great Britain
Brandenburg/Prussia
Frederick I, Elector of Brandenburg (1371–1440), also known as Frederick VI, Burgrave of Nuremberg Frederick II, Elector of Brandenburg (1413–1470), Margrave of Brandenburg Frederick William, Elector of Brandenburg (1620–1688), Duke of Prussia Frederick I of Prussia (1657–1713), Elector of Brandenburg Frederick II of Prussia (1712–1786), King of Prussia, Frederick the Great Frederick III, German Emperor (Frederick III of Prussia, 1831–1888), German emperor and King of Prussia Frederick William I of Prussia (1688–1740), King of Prussia Frederick William II of Prussia (1744–1797), King of Prussia Frederick William III of Prussia (1770–1840), King of Prussia Frederick William IV of Prussia (1795–1861), King of Prussia
Denmark
Frederick I of Denmark (1471–1533), King of Denmark and Norway
Frederick II of Denmark (1534–1588), King of Denmark and Norway
Frederick III of Denmark (1609–1670), King of Denmark and Norway
Frederick IV of Denmark (1671–1730), King of Denmark and Norway
Frederick V of Denmark (1723–1766), King of Denmark and Norway
Frederick VI of Denmark (1768–1839), King of Denmark and Norway
Frederick VII of Denmark (1808–1863), King of Denmark
Frederick VIII of Denmark (1843–1912), King of Denmark
Frederick IX of Denmark (1899–1972), King of Denmark
Frederik, Crown Prince of Denmark (born 1968), Crown Prince of Denmark
Frederik Raben-Levetzau (1850–1933), Danish count and politician
Holy Roman Empire
Frederick I, Holy Roman Emperor (1125–1190), king & emperor
Frederick II, Holy Roman Emperor (1196–1250), king & emperor
Frederick III, Holy Roman Emperor (1415–1493), German ruler
Mantua
Federico I Gonzaga, Marquess of Mantua
Federico II Gonzaga, Duke of Mantua
Naples
Frederick of Naples (1452–1504), King of Naples
Nuremberg
Frederick III, Burgrave of Nuremberg (c. 1220–1297) Frederick IV, Burgrave of Nuremberg (1287–1332) Frederick V, Burgrave of Nuremberg (died 1398)