Falkenstein Castle (German: Burg Falkenstein) is a ruined castle located near Dettingen am Albuch, a borough of Gerstetten, in Heidenheim district of Baden-Württemberg in Germany. The castle is one of at least 16 castles known as Falkenstein in Germany, and is therefore called Falkenstein (Gerstetten) to clarify which castle is meant.