Schloss Luberegg, Cultural heritage castle in Emmersdorf an der Donau, Austria.

Schloss Luberegg is a long, early-classicist building complex on the left bank of the Danube in St. Georgen bei Emmersdorf. Its nearly 100-metre row consists of five cubic structures: a twelve-axis main house, two storeys only in the centre, flanked by long single-storey wings ending in three-axis corner houses. The unadorned façades have grey larch-shingle roofs, and two freestanding herms support a balcony with wrought-iron railing above the main entrance.

Joseph Freiherr von Fürnberg, owner of the Leiben estate, built the complex between 1774 and 1787 as a timber-floating yard and post station; he received the floating privilege on 16 July 1774 and the postal privilege in 1791. In 1795, with debts of two million gulden, he sold everything to Baron von Braun, acting for the Imperial Family Fund. Emperor Franz II used the house as a summer residence from 1803 to 1811; French soldiers occupied it in 1805.

The name Luberegg comes from the site at the mouth of the Weitenbach, where logs floated from the Weinsberg forest were sorted. From 1791 the complex also held the postal privilege for the Waldviertel, linking the region toward Pöggstall and Budweis. Today the western corner house has housed a Heuriger since about 2003.

The five linked buildings stand in a row facing the Danube, with the main house in the middle and three-axis corner houses at each end. The site was flooded in 2002 and a flood protection structure was built in 2005. The restaurant occupies the ground floor of the main building; the western corner house has housed a Heuriger since about 2003.

The castle originally served as a timber floating station and postal office, connecting the Waldviertel region to important trade routes. This dual function made it a strategic hub for commerce and communication along the river.