Frederick Augustus of Saxony may refer to: Elector Augustus II the Strong (1670–1733), King of Poland and Frederick Augustus I of Saxony Elector Augustus III the Saxon (1696–1763), King of Poland and Frederick Augustus II of Saxony Frederick Augustus I of Saxony (1750–1827), Elector, later King of Saxony, Duke of Warsaw Frederick Augustus II of Saxony (1797–1854), King of Saxony Frederick Augustus III of Saxony (1865–1932), last King of Saxony Frederick Augustus of Saxe-Eisenach (1663–1684), hereditary Prince of Saxe-Eisenach