Court Theatre of Buda, Historic theatre in Budapest Castle District, Hungary

The Court Theatre of Buda occupies the former Carmelite monastery and church on Szent György tér, in the Castle Quarter of District I. The Baroque church, built 1725–1736, was converted into a theatre in 1786 by Wolfgang von Kempelen; its exterior facade was kept in the 1977 reconstruction while the interior was entirely redesigned. A memorial plaque marks the building's bicentenary.

A Franciscan church built in 1270 stood on the site and was turned into a mosque under Ottoman rule before collapsing in 1686 during the siege of Buda. The Carmelites received the land in 1693 and completed a Baroque church and monastery in 1736, consecrated in 1763. Joseph II dissolved the order and had it converted into a theatre in 1786 by Wolfgang von Kempelen; it opened as the German Theatre of Ofen on 17 October 1787.

This venue played a crucial role in Hungarian cultural identity by hosting early performances in the Hungarian language. It became a symbol of national expression at a time when German dominated the stages.

The building stands on the east side of Szent György tér in the Castle Quarter, bordered by the Sándor Palace to the south and the rebuilt former army headquarters to the west. Since 1 January 2019 it has housed the Prime Minister's Office, and in May 2026 the government moved its offices near Parliament and opened the monastery to the public pending a new use.

Ludwig van Beethoven performed a concert here in 1800, contributing to the building's prominence in European musical history. This performance remains one of the most notable moments in its past.