Calbe Castle, formerly written by Calbe, is the ruin of a moated castle between two arms of clemency in the city of the town of Kalbe in the Altmarkkreis Salzwedel in Saxony-Anhalt.
The Wasserburg was built in the 10th century as a Saxon border fortress, probably on the site of a Slavic Wallburg. The castle was well protected from attackers by three moats and four fortresses and entrenchments. Nonetheless, warlike conflicts or fires repeatedly destroyed the castle. It was named for the Bavarian noble family of Kalben, which is mentioned in 1207 in connection with the castle. In 1324 the castle was extended by the family of Alvensleben to the largest castle of the Altmark, in 1479 it was last renewed and demolished in 1631 in the Thirty Years' War.
The former castle, on a swamp nest of the Kalbeschen Werder, had a castle surface with a diameter of 360 meters and 1584 was still clearly visible in the area. In 1903, the castle ruins were prepared by the family of Alvensleben so that they did not deteriorate further. The castle owners were expropriated in 1945. Today ruins of the chapel, the gate and the residential house are still preserved. The castle is listed.