Montgelas-Schlösschen, Manor house in Großhesselohe, Germany.

Montgelas-Schlösschen is a manor house in Pullach featuring two square belvedere towers flanking a central projection with round windows on its southern facade. The entire southern frontage spans approximately 27 meters and shows the neoclassical style of the early 1800s.

The site was first recorded in 776 as the Schwaige Hesselohe, a farm mentioned in a charter of Duke Tassilo III of Bavaria. In 1301 the Heilig-Geist-Spital of Munich acquired it; after secularisation the farm was sold in 1806. Jean-Baptiste Drouet d'Erlon bought it in 1818 and built a brewery in 1820. Maximilian von Montgelas acquired it in 1834 and had Jean Baptiste Métivier rebuild the house as a neoclassical schloss.

The name Montgelas-Schlösschen comes from Maximilian von Montgelas, who bought the estate in 1834; locals also call it Großhesseloher Schlösschen after the Großhesselohe district. The site began as the Schwaige Hesselohe, a farm first recorded in 776 in a charter of Duke Tassilo III. Since the postwar purchase by entrepreneur Franz Gradinger, the villa has served as headquarters of Hermes Arzneimittel Holding GmbH.

The building now houses a pharmaceutical company headquarters and is located in Pullach, a town south of Munich. As the property is privately used, viewing from outside is possible, but interior access is not available.

A section of the brewery that Jean-Baptiste Drouet d'Erlon had built on the site in 1820 still stands as part of the estate. Maximilian von Montgelas, who bought the property in 1834, enlarged both the brewhouse and the beer cellar.