Zlonice Castle, Medieval castle in Central Bohemia, Czech Republic.

Zlonice Castle is a three-winged building in Zlonice, Central Bohemia. The north and west wings have two storeys, while the east wing has only one. In the courtyard, the ground-floor pillars of the original arcades survive, along with the Valkoun of Adlar coat of arms and the year 1602. The Kinský coat of arms from 1835 is on the facade.

Zlonice Castle was first recorded in 1352, probably as a royal castle, and stayed in royal hands until the Hussite Wars. In 1560 Václav Valkoun of Adlar had the old castle rebuilt as a Renaissance chateau, and Bohuchval Valkoun began further building work after 1601. A fire in 1758 led to its conversion into offices and flats, and in 1833 the arcades were walled up.

The name Zlonice Castle is also recorded as Štáf. The building has served as apartments and offices since a fire in 1758, and further conversions in 1833 walled up the arcades. In the courtyard, look for the Valkoun of Adlar coat of arms with the year 1602, and the Kinský coat of arms of 1835 on the facade.

The castle is located in the town center of Zlonice and is accessible via the railway line connecting Louny and Kralupy nad Vltavou. Its central position makes it easy to reach and well integrated into the town's layout.

The four-room palace of the late-Gothic castle survives in the basement of the east and part of the north wing, in barrel-vaulted rooms with slit windows. In the courtyard, look for the Valkoun of Adlar coat of arms with the year 1602, and the Kinský coat of arms dated 1835 on the facade.