Maria-Theresien-Schlössel, Baroque former hunting lodge and bank museum in Währing, Vienna, Austria

Maria-Theresien-Schlössel is a single-storey Baroque country house at Gersthofer Straße 143 in Vienna's 18th district, Währing. The 18th-century building was extended with a new banking hall when the Erste österreichische Spar-Casse remodelled houses 141–145, and it now houses the Erste Bank museum. On the upper floor a small hall has illusionistic wall paintings; the banking hall holds a dolphin fountain brought over from the savings bank's main building on the Graben.

The Maria-Theresien-Schlössel is a one-storey Baroque country house in Gersthofer Straße 143, used by Empress Maria Theresa as a hunting lodge. In the course of the Erste österreichische Spar-Casse's remodelling of houses 141–145, a new Kassensaal was added to the 18th-century building and fitted out as a small museum. The building now belongs to the Lammel + Stix Immobilien Gruppe and is let entirely to Erste Group Bank AG.

The name recalls Empress Maria Theresa, who used the one-storey Baroque country house as a hunting lodge. Since the Erste österreichische Spar-Casse added a new cashier's hall to the 18th-century building and installed a small museum there, visitors see the dolphin fountain brought over from the savings bank's main branch on the Graben.

The Schlössel stands at Gersthofer Straße 143 in Währing, in the 18th district, and is fully rented to Erste Group Bank AG, so the former hunting lodge and its museum are not open as a regular public museum. The illusionistic upper-floor hall and the dolphin fountain in the Kassensaal, brought over from the Sparkasse headquarters on the Graben, are interior features to ask about rather than rooms to tour freely.

The walls of the upper floor display illusionistic paintings that make rooms appear larger than they actually are. This trompe-l'oeil technique was a favorite trick of Baroque artists to make modest hunting lodges look more grand.