Grundmühle Liegau-Augustusbad, Former watermill in Liegau-Augustusbad, Radeberg, Germany

Grundmühle Liegau-Augustusbad is a watermill complex located along the Große Röder river, comprising several buildings including a bakery house where remnants of the original oven remain visible. The layout and structures reveal how grain milling and baking operations functioned together in a single site.

A mill existed on the site by 1793, when miller Johann Christoph Günther sold it to Johann Gottlieb Arnoldt for 1,100 talers plus 80 talers annual hereditary lease. Karl Gottlieb Arnoldt took over in 1822 and had the main building erected in 1826, followed by the long stable building in 1837 and a sawmill in 1838. As industrialization made watermills unprofitable, the site became a restaurant, and the name "Arnoldtsmühle" came into use.

Locals long called it Arnoldtsmühle after the Arnoldt family, who ran the mill from 1793 into the 1880s. From the late 19th century the mill was also a restaurant and excursion destination for bathers from the nearby Curbad Liegau and Augustusbad and for Radeberg citizens. A sorbian gate building, the Wendentor, was brought onto the grounds from the 1896 Dresden exhibition of Saxon crafts.

The complex sits on the right bank of the Große Röder at the edge of the Seifersdorfer Tal protected area, north of Dresden. The Röderbrücke built in 1806 and the riverside garden between river and main building are on site. Paths along the Röder can be uneven, so sturdy footwear helps.

The so-called Wendentor on the grounds is a Sorbian farm gate building that came from the Saxon Exhibition of Crafts and Applied Arts held in Dresden a year earlier; sources date its arrival to 1897, others to 1911. In 1929 the tenant Rößler received a licence to serve drinks in one room, the pavilion and the garden, and putti marking the beer garden entrance probably date from then.