Gutshaus Siethen, listed manor house in Siethen, Ludwigsfelde, Germany

Gutshaus Siethen is a listed manor house in Siethen, part of Ludwigsfelde, standing northwest of the junction of the L795 and Siethener Dorfstraße on walled grounds, with the village church to the southwest. The core is a nine-axis building rebuilt in 1880 in Neo-Renaissance style, with a three-axis central risalit on the courtyard side, two full storeys and a mansard roof. In 1898 Franz Schwechten's plans added eight axes, a large dining hall and a new staircase, with access moved to an eastern annex; the 1950s work gave it a plain upper storey with tall rectangular windows.

The Siethen estate's documented history begins with knight Heinrich von Gröben, who lived there; in the early 15th century it passed to the von Schlabrendorf family. In 1879 Karl von Jagow sold it to Berlin merchant Hermann Badewitz for 180,000 talers, and in 1880 the existing manor was rebuilt in Neo-Renaissance style. After Badewitz died in 1897, his son Gottfried had Berlin architect Franz Schwechten enlarge the house from nine to 17 axes in 1898; Gottfried was ennobled in 1914.

The estate's official heritage listing covers the manor house at Potsdamer Chaussee 11, the roughly seven-hectare Gutspark and the farmyard on Siethener Dorfstraße 2 with its manager's house, shed, cattle barn, pigeon house and courtyard wall. The park once reached the Siethener See, where a tribune-like projection called Schöne Aussicht and a bathing hut with a jetty stood. A 1941 inventory of Teltow district monuments records a gravestone in the park for Charlotte Dorothea Freiin von Berdy, née Freiin von Keller (1760–1807).

The estate lies northwest of the junction where the Siethener Dorfstraße branches west off the L795, on a plot enclosed by a wall; the village church of Siethen stands to the southwest. The listed ensemble takes in the manor house at Potsdamer Chaussee 11, the roughly seven-hectare park reaching down to the Siethener See, and the farmyard at Siethener Dorfstraße 2 with its manager's house, shed, cattle barn, pigeon house and courtyard wall. The house itself was converted into private apartments after 2017, so it is seen from outside.

The estate's landscape park once covered about seven hectares and reached the shore of the Siethener See, where a grandstand-like projection called "Schöne Aussicht" and a bathing hut with a jetty stood. A 1941 inventory of Teltow district monuments records a gravestone in the park for Charlotte Dorothea Freiin von Berdy, née Freiin von Keller (1760–1807).