Holzheim Castle, Medieval castle in Langerwehe, Germany.

Holzheim Castle is a lowland castle west of Heistern in the municipality of Langerwehe, county of Düren, North Rhine-Westphalia. Its surviving manor house and gate tower were built between the 15th and 17th centuries. The complex stands between Heistern and the Bovenberg Forest and is used today as a farm and riding estate.

Holzheim Castle dates to 1333, when its owners were vassals of the Duchy of Jülich. The surviving manor house and gate tower were built between the 15th and 17th centuries. In 1818, with the area in the Prussian county of Düren, the castle and its lands were sold to private buyers. Richard Schleicher bought it in 1893, along with the nearby Schönthal estate, and it later changed hands several times.

The name Holzheim is shared with the Holzheimer Graben stream that passes east of the complex. The manor house and gate tower, built between the 15th and 17th centuries, are the two surviving parts of the castle. Since 1893 the estate has been linked to Richard Schleicher, who also acquired the nearby Schönthal estate; the property later changed hands several times.

The site operates as an active farm and equestrian facility and should be visited respectfully with this in mind. Access is best arranged from Langerwehe, and visitors should check for appropriate entry points beforehand.

The Holzheimer Graben, the stream east of the castle, flows into the Inde at Hücheln. The sources record only its course, not any defensive function. The castle itself dates to 1333, when its owners were vassals of the Duchy of Jülich.