Schloss Purgstall, Medieval castle in Purgstall an der Erlauf, Austria.

Schloss Purgstall is a medieval castle in Purgstall an der Erlauf in Lower Austria, situated on a triangular plateau of conglomerate rock where the Feichsenbach and Erlauf rivers meet. The estate encompasses approximately seven hectares of park land surrounding the fortress structures.

The castle was established around 1100 by the Regensburg bishopric as a fortified settlement and transferred to the Lengenbach family in 1121. Over subsequent centuries it changed hands and evolved into a residential estate.

The castle's name appears in 12th-century documents as "de Purchstall", used by the Lengenbach brothers Hartwig, Heinrich and Otto. From 1568 to 1785 the complex was split between a Catholic and a Protestant branch of the owning family, called Neuschloss and Altschloss. The northern part received its own gate with a tall tower, shown in a 1672 engraving by Georg Matthäus Vischer.

The castle itself is private and cannot be visited; only part of the castle park is open to the public. The park covers almost seven hectares on both sides of the Erlauf. The Feichsenbach borders the site to the north and west, the Erlauf to the east.

From August 1943, Vienna's Städtische Sammlungen stored part of their holdings in five rooms of the castle, including furniture, weapons and armour. Because of the remote location, losses were small. The Florian family, owners since 1933, still runs the estate administration from the castle.