Altheim, Upper Austria, market town in the district of Braunau, alt. 360 m, pop. 4,681, area 22.61 km2, in the valley of the Altheimer Ache river. - hot water spring; commuting centre; economic structure mainly influenced by Wiesner-Hager company (furniture company and construction group), machine manufacturing and metal processing industry, tinned fruit factory, breweries. - First documented in 903, St. Sebastian market church (built 1634 as chapel commemorating the Plague) and St. Laurentius parish church changed to Baroque style (1516-1539) with Baroque interior by J. M. Vierthaler (1734); triangular square.
Further reading#L. Bodingbauer, I. Saufer, Altheim. Heimatbuch, 1975.