Mülheim Castle, Medieval castle in Zülpich, Germany

Mülheim Castle stands at the northwestern edge of Mülheim, a district of Zülpich, beside the Rotbach stream. The former water castle is now a large four-sided farm courtyard; its buildings were completely rebuilt after a fire in 1863 and altered several times afterwards. The 1829 original cadastre records only a moated courtyard fortress, where a manor house may once have stood.

Mülheim was originally a Prüm possession and later passed to the Electorate of Cologne. The castle's construction must have taken place in the 13th century. In the 16th century a line of the Schall von Bell family is named as owner; in 1770 Otto Degenhard Schall von Bell and Philipp Wilhelm von Boulich were still listed on the Cologne knightly register. At the end of the 18th century the estate belonged to the Imperial Counts von der Leyen until they were expropriated by the French government. In 1863, after several private owners, the Duke of Arenberg acquired the farm.

The name Mülheim derives from the estate's early ownership by the Abbey of Prüm before it passed to the Electorate of Cologne. In the 16th century a line of the Schall von Bell family held the property; Otto Degenhard Schall von Bell and Philipp Wilhelm von Boulich still appear on the Cologne knightly register of 1770. Today the courtyard is run as a farm with a farm shop.

The farm is a working agricultural estate with an on-site farm shop; the courtyard buildings stand on the northwestern edge of Mülheim by the Rotbach. The complex is private working property, so visitors should keep to the shop area and respect the farmyard.

The 1829 Urkataster records only a moated courtyard fortress, with possibly a manor house on the site; the present four-sided farmyard buildings date from after a fire in 1863. The estate passed from the counts von der Leyen, expropriated by the French, to the Duke of Arenberg in 1863.