Osek Castle, Baroque revival château in Osek u Radomyšle, Czech Republic.

Osek Castle is a baroque revival château featuring symmetrical stone walls, rectangular windows, and decorative façade elements characteristic of early 20th-century design. The building sits within a surrounding park that frames the main structure and provides additional outdoor grounds.

The Osecký z Brloha family founded a fortress here in the 15th century; Absolon z Brloha is recorded in 1442. It was rebuilt in Renaissance style in the second half of the 16th century, then burned by imperial troops after Zdeněk's property was confiscated in 1623 for his part in the Bohemian revolt. From 1739 it passed through several owners until the Daubek family had it rebuilt in baroque revival style in 1911 to Hugo Leuthendorf's design.

The château has housed a home for people with disabilities since the second half of the 20th century, so the interiors are not open to the public. The name Osek comes from the village of the same name, and the estate was held by the Osecký z Brloha family from 1442 until the childless death of Jan Osecký z Brloha in 1529.

The château is not open to the public: it houses a home for people with disabilities, so visits are limited to viewing the exterior and the early 20th-century English park from outside. The four wings enclose a small courtyard entered through gateways in the north and south wings.

The interior retains many original features from the 1911 reconstruction, including decorative elements and spatial arrangements from that period. These details let visitors experience the design standards and craftsmanship of the early 20th century.