Schloss Fridau, Baroque castle in Ober-Grafendorf, Austria.

Schloss Fridau is a castle complex in Ober-Grafendorf made up of the Neuschloss, the Altschloss, the Kanzleigebäude, a garden pavilion and the castle park. The Neuschloss, built in 1753, is a three-storey, three-winged building with an Ehrenhof; its garden facade is 13 axes wide, with a three-axis central risalit projecting polygonally. The Altschloss is an irregular complex around a wide U-shaped courtyard, with cores dating partly from the 15th century.

The Altschloss was first mentioned in 1299 as a noble seat of the Weißenberger family. From 1497 to 1708 it belonged to the Sinzendorf family. In 1750 Baron Johann Georg von Grechtler bought the estate, installed a barchent factory in 1751 and had the Neuschloss built in 1753. In May 1945 the castle served as a military hospital; bullet holes on the facade date from the defence against Soviet troops.

The grand hall displays ceiling paintings by Daniel Gran, showing the artistic skills of 18th-century Austria. Visitors can see these works today and experience the craftsmanship of that era.

The complex lies in Ober-Grafendorf in the Pielach valley, with the Neuschloss set in a park and the Kanzleigebäude west of it. The preserved part of the former Baroque garden and its long orangery pavilion are reached on foot; paths and courtyard paving are uneven, so sturdy shoes help. The site is privately owned, so visits depend on the owner's arrangements.

The Baroque Neuschloss was built in 1753 for Johann Georg von Grechtler, who had a Barchent factory set up in the old castle in 1751. Bullet holes on the facade date from May 1945, when the estate was defended against advancing Soviet troops; a Soviet commandant's office then moved in.