Coswig Castle, Baroque château in Coswig, Germany

Coswig Castle is a Baroque residence in the town of Coswig featuring stone facades, symmetrical windows, and ornamental details across multiple floors. The building combines Renaissance and Baroque architectural elements and appears as a substantial mansion with classical proportions.

A castle at Coswig is documented from 1187; the Schloss itself was first mentioned in 1342 as a widow's estate for Princess Agnes of Anhalt. Spanish troops burned it in 1547 and it was rebuilt between 1555 and 1560. From 1873 it served as a Zuchthaus for 300 inmates, with the south wing raised by two storeys; under the Nazis up to 900 political prisoners were held in its cells, and the Strafanstalt Coswig operated until 1957.

The castle's name comes from the old fortified settlement of Cossewiz, and the Anhalt princes made Coswig their seat from 1212. The last resident princess, Friederike Auguste Sophie, died here in 1827, ending the castle's courtly period. Since 2014 concerts have been held in the building, and the owner Magnolia Albertazzi plans a centre for transnational cultural cooperation.

The castle stands at Schloßstraße 44–46, with the entrance on the inner courtyard; two guard buildings flank the gate, and the former stables lie to the left. The west and north sides are still bordered by a moat. Restoration has been under way since 2007, so parts of the building may be closed off.

The prison was built for 300 inmates, but under the Nazi regime up to 900 political prisoners were held in the cells. The south wing had been raised by two storeys in 1873 for the prison, and those prison floors were demolished in 2008.