​THANN, a town of Germany, in Upper Alsace, 16 m. by rail N.W. of Mülhausen. Pop. (1905) 7901. It is the seat of cotton, calico, silk, machinery and other industries, and excellent wine is grown there. The (Roman Catholic) church of St Theobald (1351) is an elegant specimen of Gothic, and has a remarkably fine tower (1450–1516), 266 ft. high. Above the town are the ruins of the castle of Engelburg, destroyed by Turenne in 1675.