Postoloprty Castle, Baroque château in Postoloprty, Czech Republic.

Postoloprty Castle is a four-winged structure combining Baroque and neoclassical architectural styles in the Czech Republic. The complex features a square tower and was built primarily in stone, with different building periods blended throughout the overall design.

A fortress built by Šebestián z Veitmile stood here from the first half of the 16th century, first recorded in 1542. Štěpán Jiří ze Šternberka replaced it from 1611 with a new Renaissance castle on a square plan; in 1620 a peasant army plundered it and destroyed its library and archive. After 1637 the Michna family had it remodelled in early Baroque style, and from 1692 it belonged to the Schwarzenbergs until 1945.

The castle's name comes from the town of Postoloprty, whose Czech name derives from the Latin Porta Apostolorum, referring to a medieval monastery gate. The Schwarzenbergs held the estate from 1692 until 1945, and their coat of arms can still be seen on the entrance gate. The building is not open to the public, so the cultural layer is visible mainly from the square.

Access may be limited since the castle is currently undergoing renovations, so visitors should check ahead before arriving. The town of Postoloprty plans to convert the space into cultural venues, which will offer more opportunities to visit in the future.

Bayer's west wing developed cracks during construction because of a design error and had to be demolished. His successor, the Viennese architect Anton Erhard Martinelli, added a chapel and a fountain in the garden, neither of which survives. The north wing and its tower were pulled down after the 1768 fire and never rebuilt.