Burg Alsbach, Medieval water castle in Engelskirchen, Germany

Burg Alsbach is a medieval water castle in Engelskirchen with a rectangular layout surrounded entirely by a moat fed by a stream. The main building is accessed via a bridge from the western outer ward and displays an elongated structure incorporating various construction elements.

First recorded in 1373 as "zu me hove", the fortified manor passed through many owners, including the Quadt family from 1532 and the Wendt family around 1800. Between 1622 and 1627 it was rebuilt, probably on the footprint of an older castle or residential tower, by extending the tower with a longhouse. In 1893 the moated complex with its outer bailey was converted into a seven-axle two-winged building. Since 1967 it has belonged to the Grafen Spee.

The name Alsbach survives in the local Schlossgarde Engelskirchen, a guard corps that commemorates Rittmeister Wienand Ruttger von Quadt zu Alsbach, who defended the village against invading Swedish troops. The house itself is still owned by the Grafen Spee, who have held it since 1967; the present owner is Pius Graf von Spee.

The manor house is reached by a narrow driveway about 300 metres long. Visitors may only view the building from the outside, as it is not open to the public. The house is entirely surrounded by a water moat, with an outer bailey lying outside it to the northwest; the southern garden parterre is linked to the house by a bridge.

The Schlossgarde Engelskirchen commemorates Wienand Ruttger von Quadt zu Alsbach, the cavalry captain who defended the village against invading Swedish troops. The house has belonged to the Grafen Spee since 1967, and Pius Graf von Spee is its present owner.