Osová Castle, Residential château in Osová, Czech Republic

Osová Castle is a residential château combining living quarters with defensive features across multiple connected wings. The buildings display Czech architectural styles from different periods, organized around several courtyards.

Osová is first documented in 1329, when Jindřich of Ronov and Osová held it; a water fortress on the site is mentioned in 1348. In 1407 Vok the Younger of Holštejn stormed and wrecked it. The Polcars rebuilt it in Renaissance style in the second half of the 16th century, and in 1577 it was called a château. Around the 1720s, under Kateřina von Walldorf, the five-wing layout became a regular four-wing Baroque building, possibly designed by Mořic Grimm.

The name Osová comes from the village, first recorded in 1329 with Jindřich of Ronov and Osová. From 1811 to 1822 the castle housed a leather-tanning factory, which required major structural changes. In 1866 it served as a cholera hospital for the surrounding area, and in 1867 a agricultural school was temporarily placed in it.

The castle stands in Osová, part of Osová Bítýška in the Žďár nad Sázavou district, with the Okolník pond on its eastern side and a landscape park to the west. It is a cultural monument, but reconstruction begun around 2015 stopped and remained unfinished as of 2024, so there are no guided tours; view the exterior and park from the village.

The castle's five-wing layout was rebuilt into a regular four-wing plan in the 1720s under Kateřina von Waldorf, possibly to a design by Mořic Grimm; the west wing was pushed outward and two angled north wings replaced by one straight one. A clock tower rose above the south façade.