Frederick Augustus
Frederick Augustus, may refer to:
- Frederick I, Holy Roman Emperor, better known as Frederick Barbarossa
- Frederick Augustus, Duke of Württemberg-Neuenstadt
- Friedrich August of Hanover, Prince, younger brother of King George I of Great Britain
- Frederick Augustus I, Elector of Saxony, better known as King Frederick August II of Poland
- Frederick Augustus II, Elector of Saxony better known as King August III of Poland
- Frederick Augustus I, Duke of Oldenburg
- Frederick Augustus, Prince of Anhalt-Zerbst
- Frederick Augustus, Duke of Nassau
- Frederick Augustus, Prince of Brunswick-Wolfenbüttel-Oels
- Frederick Augustus III, Elector of Saxony, who then became King Frederick Augustus I of Saxony
- Frederick Augustus, Count of Erbach-Fürstenau
- Prince Frederick, Duke of York and Albany, son of George III of the United Kingdom
- Frederick Augustus II of Saxony
- Frederick Augustus II, Grand Duke of Oldenburg
- Frederick Augustus III of Saxony, last king of Saxony