Crookston Castle is a ruined medieval castle in the Pollok area of Glasgow, Scotland. It is located some five miles south-west of the city centre, on a hill overlooking the Levern Water, just before its confluence with the White Cart Water. Crookston Castle was built by the Stewarts of Darnley around 1400, and is set within earthworks constructed in the 12th century. Once the property of the earls and dukes of Lennox, the castle was extensively repaired following a siege in 1544, and it is the only surviving medieval castle in Glasgow.