Falkenstein Castle () 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. The ruins of the castle are open to the public and require a walk of less than an hour to visit.