Choustnikovo Hradiště, Castle ruin in Choustníkovo Hradiště, Trutnov District, Czech Republic.

Choustnikovo Hradiště is a Gothic castle ruin in the Hradec Králové Region. The remains feature stone walls, underground cellars, and defensive ditches scattered across elevated terrain.

The castle was first mentioned in writing in 1316, when King John of Luxembourg pledged Dvůr Králové and its surroundings to Půta of Turgov. Heřman of Choustník, who bought it in 1382, had it enlarged. In 1645 Swedish troops under General Torstenson captured and wrecked it; Count Jan Špork had it repaired after 1664, and his son František Antonín converted it into a Celestine convent after 1705.

The ruins show how medieval builders positioned fortified structures on hilltops to survey the surrounding landscape. The layered defensive walls that remain reveal the practical thinking behind Czech castle design from that era.

The ruins are freely accessible, but no marked hiking trail leads to them; the village is crossed by cycle routes 4087 and 4097. The site lies on a promontory above the market town of Choustníkovo Hradiště, near Dvůr Králové nad Labem.

The castle became a ruin only after 1739, when the Celestine nuns moved to a new convent in Prague's Jindřišská Street; the abandoned buildings were then quarried for building stone. The site has been protected as a cultural monument since 1964.