Thurso Castle (alternatively, Castrum De Thorsa, Castle of Ormly, and Castle of Ormlie) is a ruined 19th-century castle, located in Thurso, Caithness, in the Scottish Highlands. Situated in Thurso East, off Castletown Road, east of the River Thurso, the site can be seen from across the river. The current castle ruins date to 1872; it was demolished in 1952, although there has been a fortress here since the 12th century.