Zásmuky Castle, Early Baroque château in Zásmuky, Czech Republic

Zásmuky Castle is a château in Zásmuky that combines Renaissance and Baroque features, including a prominent tower and several attached structures. The ensemble displays decorative elements across its buildings that reflect its role as an important residence over multiple centuries.

A fortress with three wings and Gothic portals stood here from around 1350, built under Ctibor of Zásmuk; its remains survive in the castle cellars. In 1533 Adam of Říčany rebuilt it as a two-storey Renaissance castle on a square plan. After devastation in the Thirty Years' War, Jaroslav Rudolf of Sternberg acquired it in 1637, and after 1653 Adolf Vratislav of Sternberg had it remodelled in early Baroque style.

The Šternberk family owned the estate from 1637 into the 21st century; their coat of arms survives on the Baroque portal of the New Castle's entrance gate. Under Adolf Vratislav ze Šternberka the castle was rebuilt in early Baroque style after 1653, and the family chapel is in the nearby former Franciscan monastery church.

The castle sits in the countryside southwest of Kolín and can be reached by traveling through rural areas. A public park on the grounds allows visitors to walk around the exterior and enjoy the surroundings.

The 1982 fire did not hit the tower wing: it broke out in the main building, which the Czechoslovak army had used as a warehouse since 1959, after wartime use as an SS weapons archive and a brief Red Army headquarters in 1945. Repairs began after Franziska Diana Sternbergová recovered the estate in 1992.