Airth Castle is a castle overlooking the village of Airth and the River Forth, in the Falkirk area of Scotland. The castle is currently operated as a hotel and spa. The castle is a major historic building, and retains much medieval fabric, and is designated as a Category A listed building by Historic Scotland. Within the castle grounds stand the ruins of the former parish church of Airth, a building, now roofless, of various periods, with substantial parts dating from the Romanesque period, and quire steeple and north aisle added by John Milne the royal master mason in 1647.