Burg Hohenkrähen, Medieval hilltop castle in Mühlhausen-Ehingen, Germany.

Burg Hohenkrähen is a castle ruin perched on a volcanic mountain at 644 meters elevation, from which it commands views across Lake Constance and the surrounding peaks. The grounds are spacious and shaped by extensive forest coverage that allows for exploration across the entire area.

The castle was built between 1180 and 1190 by the Lords of Friedingen, who were also called 'de Craien' from 1191. In 1512, after a three-day siege, troops of the Swabian League under Paul von Lichtenstein and Georg von Frundsberg captured and burned it; it was later rebuilt. In 1634, Konrad Widerholt, commander of Hohentwiel, burned it down again, and it has been a ruin ever since.

The castle's name comes from the Lords of Friedingen, who were called "de Craien" from 1191. Local legends tell of the robber knight Popolius Maier, known as the Poppele, said to roam the area as a castle ghost; a field cross at the foot of the mountain is meant to ward him off. The figure appears in many local tales and plays a role in the Singen carnival.

The site is freely accessible with no entrance fees, making it a straightforward destination to visit. However, there are no facilities on the grounds and wheelchair access is not available, so wear sturdy shoes and allow time for the climb to the summit.

The castle ruin has served as the federal centre of the Pfadfinderschaft Grauer Reiter scout association since 1956, when it was leased from Graf Douglas Freiherr von Reischach. The scouts maintain the buildings in the Vorburg, and in 1957 the first Überbündisches Treffen of the youth movement was held at the foot of the castle.