Schloss Ochsenburg, Castle in St. Pölten, Austria.

Schloss Ochsenburg stands on a roughly 30-metre-high rock spur on the right bank of the Traisen in the Ochsenburg district of St. Pölten. The medieval castle of the Ochsenburg family was rebuilt as a Renaissance palace in the 16th century, and a Baroque south wing was added around 1698, probably under Jakob Prandtauer. The castle and the adjoining farmstead to its east are listed as protected monuments.

The castle began as a medieval fortress, was later converted into a Renaissance residence, and received a substantial expansion on its south side during the Baroque period. These transformations reflect how its inhabitants adapted to changing times and artistic fashions.

The castle chapel is dedicated to Saint Nicholas. In the 18th century it was redecorated with the involvement of Martin Johann Schmidt, a painter from the region known as Kremser Schmidt. The chapel belongs to a building that served the bishops of St. Pölten as a summer residence after renovation.

The castle is privately owned and not open for general visits; it serves as a summer residence for the bishops of St. Pölten. From outside, you can view its outline from the opposite riverbank and see the impressive profile of the building against the sky.

The chapel of St. Nicholas was redesigned in the 18th century with Martin Johann Schmidt, called Kremser Schmidt, taking a leading part. In 2010 the Diocese of St. Pölten offered the castle for sale at about three million euros; no buyer was found by mid-2011, so it was renovated and rented out for celebrations while a purchaser was still sought.