Schloss Kalteneck, Renaissance water castle in Schwenningen, Germany

Schloss Kalteneck is a three-storey Renaissance building on an island in a spring-fed pond at the eastern edge of Schwenningen. It has a saddle roof, corner oriels on the west gable and the south-east corner, and a square six-storey stair tower on the east side with a pyramidal roof. A wooden bridge crosses the moat.

Schloss Kalteneck was built around 1570 for the knight Kaspar Schenk zum Schenkenstein, who held the local lordship over Bissingen im Kesseltal. It stands on an island in a spring pond, on a foundation of oak trunks driven into the gravel bed. Later owners, among them the families von Gundelsheim, von Taufkirchen and von Erolzheim, altered it through conversions that gradually erased its Renaissance form. In 1830 a tavern opened in the castle, supplied by the adjoining Schlossbrauerei built by owner Franz Xaver von Linder; the brewery closed in 1982.

The name Kalteneck, first recorded in 1425 as "Kaltenegk", likely refers to the cold winter winds whistling around the corner. Since 1830 the castle has housed a tavern serving beer from the adjoining Schlossbrauerei, which the owner Franz Xaver von Linder had built; the brewery closed in 1982. The descendants of a Bergheim brewer still own the site.

The castle is privately owned by the descendants of a Bergheim brewer who bought the estate in the late 19th century, so it is not open as a hotel or for regular tours. A wooden bridge crosses the moat to the building on its island in the spring pond. The castle and both banks of the moat are listed as a natural monument (033-ND).

The castle stands on an island in a spring-fed pond, resting on a foundation of oak trunks driven into the gravel bed. The moat, together with both banks and the building, is registered as a natural monument (033-ND) as well as a Bavarian heritage monument (D-7-73-164-5).