Schloss Kalkum, Castle in Kalkum district, Düsseldorf, Germany

Schloss Kalkum is a castle with classical architecture in Düsseldorf, where the main building sits surrounded by connecting structures and outbuildings. A large park with pathways covers the grounds and frames the entire complex.

The castle began as a knight's seat and received its current classical form between 1808 and 1814 under architect Georg Peter Leydel. This change from older baroque to classical style became the castle's lasting appearance.

The park was laid out in the English landscape style under Maximilian Friedrich Weyhe at the time of the classical rebuilding, and covers about 19 hectares. It is open to the public. In a tower-like pavilion on the eastern park wall, a memorial recalls Ferdinand Lassalle, who represented Countess Sophie von Hatzfeldt in her divorce case from 1846 to 1854.

The castle stands about two kilometres northeast of Kaiserswerth in Düsseldorf's north. The roughly 19-hectare park is open to the public, while the castle itself is not open as a museum and is used for concerts and events. The Lassalle memorial pavilion stands at the eastern wall of the park.

The divorce case between Count Edmund von Hatzfeldt and his wife Sophie ran from 1846 to 1854 and produced 36 court hearings. Her lawyer was Ferdinand Lassalle, then only 20 years old; a memorial in a tower-like pavilion on the eastern wall of the park commemorates him.