Schloss Allentsteig, Renaissance castle in Allentsteig, Austria.

Schloss Allentsteig is a five-sided Renaissance building on a rock in the north of Allentsteig, its outer wall largely that of the medieval castle. The oldest parts are the massive bergfried from the second half of the 12th century, with a Romanesque portal on the courtyard side, and the adjoining ashlar wall to its east. The tower's crenellated upper storey with tent roof dates from 1904, and the three-storey arcaded courtyard, marked 1576, has flat-arched arcades on Tuscan columns.

The castle originated around 1000 under the Kuenring family and underwent comprehensive renovations between 1544 and 1570. These transformations converted the medieval fortress into a Renaissance residence that shaped the structure we see today.

The castle has been the seat of the Allentsteig military training area command since 1938, a role it kept after Austria regained sovereignty in 1955. The 4th Reconnaissance and Artillery Battalion is also stationed there. The five-sided outer wall largely survives from the medieval castle, and the oldest parts are the massive keep from the second half of the 12th century with a Romanesque portal on the courtyard side and the adjoining ashlar wall to the east.

A military installation currently occupies the castle grounds, which significantly restricts interior visits. The best views of the structure are from Pfarrer Josef Edinger Platz, where the towers and facades are clearly visible.

The castle changed hands several times and was briefly controlled in 1486 by mercenaries of Hungarian King Matthias Corvinus. It was later acquired by the Princes of Liechtenstein, who held influence there for many years.