47°49′0″N 9°18′36″E / 47.81667°N 9.31000°E
Heiligenberg Castle (German: Schloss Heiligenberg) is a princely castle in renaissance style, situated in Heiligenberg, Linzgau within the state of Baden-Württemberg, Germany. It is sited on a plateau 730 metres above sea level and with views down into the Bodensee and the Alps. It contains one of the most well preserved renaissance halls north of the Alps. The castle is owned and lived in by the Fürstenberg family, and cannot be visited.