Gut Ascheberg, Estate and château in Ascheberg, Schleswig-Holstein, Germany.

Gut Ascheberg is an estate on the western shore of Großer Plöner See in Schleswig-Holstein. Its mansion, known as Schloss Ascheberg, was built in 1869–1870 by Hermann Georg Krüger in the Historicist style with Italian Renaissance influences: a nine-axis yellow brick building with two three-axis risalits and a tall observation tower. The estate still farms about 1,100 hectares, and remains of a French Baroque garden survive in outline.

Ascheberg was first mentioned in 1190, in the Saxon-Wendish border area where a water castle probably stood in the Middle Ages. A fortified knight's seat of the same name was documented in the 13th century. The von Ascheberg family died out in 1535; the estate had already passed to the Rantzau family in the 15th century, who established the later estate economy and remained until 1799, interrupted only by brief inheritances to the Pogwisch and Sehestedt families.

The name Ascheberg goes back to a first mention in 1190. The estate has been farmed without interruption for centuries and is still worked today; the farmyard with the present manor house opens only for the annual farmers' markets. The former manor house is leased to a Christian youth organisation as a holiday home.

The site now serves as a youth recreation center and is partially accessible to visitors during annual markets and special events. Checking beforehand for open days is recommended, as public access is typically limited to organized occasions.

The mansion visitors see today is not the baroque house Hans zu Rantzau planned: it was built in 1869–70 by Hermann Georg Krüger in historicist style with Italian Renaissance echoes, a nine-axis yellow brick building with a tall viewing tower. Its baroque predecessor stood at the other end of the linden avenue and was already dilapidated in the 19th century.