Frederick II

Frederick II may refer to:
 * Frederick II, Duke of Upper Lorraine (c. 995–1026), count of Bar and duke of Lorraine, co-reigning with his father from 1019
 * Frederick II, Duke of Swabia (1090–1147)
 * Frederick II, Holy Roman Emperor (1190–1235), King of Sicily from 1198; Holy Roman Emperor from 1220
 * Frederick II of Austria (died 1246), Duke of Austria 1230–1246
 * Frederick III of Sicily (1272–1337), the second Frederick to rule the Kingdom, great grandson to the first such-named King of Sicily, Frederick II, Holy Roman Emperor
 * Frederik II van Sierck (died 1322), bishop of Utrecht
 * Frederick II, Margrave of Meissen (1310-1349)
 * Frederick II, Elector of Saxony (1412–1464)
 * Frederick II, Margrave of Brandenburg (1413–1471), margrave 1440–1470
 * Frederick II, Elector Palatine (1482–1556), elector 1544–1556
 * Frederick II of Denmark and Norway (1534–1588), king 1559–1588
 * Frederick II, Duke of Saxe-Gotha-Altenburg (1676–1732)
 * Frederick II, Landgrave of Hesse-Cassel (1720–1785)
 * Frederick II of Prussia (1712–1786), king 1740–1786, better known as Frederick the Great
 * Frederick II, Duke of Mecklenburg-Schwerin (1717–1785)
 * Frederick II, Duke of Anhalt (1856–1918)