Margarethen am Moos Castle, Renaissance castle in Enzersdorf an der Fischa, Austria.

Margarethen am Moos is a two-storey, four-winged Renaissance castle forming an almost square Vierkanter with a hipped roof. Its nine-axis south-west main facade has a three-axis central risalit with rounded corners, crowned by a broken pediment above the main portal. The facade is decorated with Faschen, lisenen and cornices, and the 2,000 m² castle park lies at the north-west edge of the village.

The site began as an 11th-century fortified refuge guarding the eastern border of the Duchy of Austria, alongside Trautmannsdorf and the fortifications of Enzersdorf an der Fischa, Schwechat, Götzendorf and Fischamend. A first rebuild came in 1336. In 1683 the castle was converted into a Renaissance water castle; in 1860 Prince Philipp von Batthyány-Strattmann gave it its present form, filling in the moat and laying out the park.

The castle chapel holds frescoes from the circle of Franz Anton Maulbertsch, the Moravian-born painter whose workshop decorated many Lower Austrian churches in the 18th century. The paintings are among the interior features that survived the damage of April 1945, when Soviet airfield personnel were quartered in the building and panelling and stucco were lost.

The place now serves as an event center for celebrations and meetings of different kinds. Visitors should check ahead about which areas are open, since events are held regularly throughout the year.

The castle was built on marshy ground that was deliberately cleared of trees and brush to stop attackers from finding shelter during sieges. This shaping of the landscape was a key part of how the fortress stayed defended.