HEIDENHEIM, a town of Germany, in the kingdom of Württemberg, 31 m. by rail north by east of Ulm. Pop. (1905), 12,173. It has an Evangelical and a Roman Catholic church, and several schools. Its industrial establishments include cotton, woollen, tobacco, machinery and chemical factories, bleach-works, dye-works and breweries, and corn and cattle markets. The town, which received municipal privileges in 1356, is overlooked by the ruins of the castle of Hellenstein, standing on a hill 1985 ft. high. Heidenheim is also the name of a small place in Bavaria famous on account of the Benedictine abbey which formerly stood therein. Founded in 748 by Wilibald, bishop of Eichstätt, this was plundered by the peasantry in 1525 and was closed in 1537.