Burgruine Blumenegg, Castle ruin in Thüringerberg, Austria

Burgruine Blumenegg is a castle ruin in Thüringerberg with remains of a keep, residential building, chapel, walls, and support structures arranged around a courtyard. The complex sits on a mountain ridge between two valleys in the region.

The castle was established in 1258 as the center of the Blumenegg lordship within the County of Montfort and evolved over the following centuries. A major fire destroyed large sections of the structure in 1774.

The name Blumenegg refers to the medieval lordship whose seat the castle was; the counts of Montfort founded the county of the same name here in 1258. The site is now privately owned by the Moosbrugger family, who bought the ruin at auction in 1842. Visitors see the remains of the chapel, keep, palas and ring walls, parts dating to the 13th century.

The ruin lies about one kilometre east-northeast of Thüringen, on a spur between the Schloßtobel and the Lutz. It is privately owned, so visitors should keep to the remains of the ring walls and courtyard and leave the masonry untouched. The terrain is uneven and the walls are unsecured.

The castle was first mentioned in a document in 1265, seven years after its construction. In 1613 the Benedictine abbots of Weingarten Abbey in Württemberg brought their treasures to Blumenegg and moved there themselves while the Swedish army was advancing during the Thirty Years' War.