St. Blasien (German pronunciation: [zaŋkt ˈblaːziən] ; sometimes spelled in full as Sankt Blasien ) is a small town located in the Waldshut district in Baden-Württemberg, Germany. It is situated in the Southern Black Forest , 17 km northeast of Waldshut-Tiengen .

St. Blaise's Abbey in the Black Forest is located in St. Blasien.