Husen Castle, Medieval tower house in Syburg, Dortmund, Germany

Husen Castle is a medieval tower house in Dortmund-Syburg, with a rectangular core of 9.3 by 11.3 metres built of Ruhr sandstone rubble masonry. The present form of the tower dates to the 17th century, and the associated estate covers about 7,000 square metres of meadows and trees.

Haus Husen, a knight's estate of the lords of Husen in the County of Mark, was first mentioned in 1259. Around 1330 Johann von der Husen held it as a fief of the Counts of Dortmund. Through the heiresses Aleke and Beleke van Husen it passed to the von Frydag family and soon after to the von Romberg. In 1585 Anton von Laer sold it back to Bernhard von Romberg; in 1830 the neoclassical Gutshaus Husen was built next to the old tower because the medieval house no longer met requirements.

The name derives from the von Husen family, first mentioned in 1259 as owners of the knight's estate. Through the marriage of Aleke van Husen to Godert von Frydag, the estate passed to the Frydag family and soon after to the von Romberg family. The site is still called Burg Husen, though the surviving residential tower dates from the 17th century.

The site operates today as a youth hostel and group accommodation and can be visited by arrangement with staff. Visitors should plan ahead since the grounds are regularly used by youth groups.

Since 1984, a Christian youth organization has run the grounds where they train young people and offer outdoor adventures. This connection with youth activities makes it a living learning space rather than just a historical site.