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Ormiston Castle is a ruined 16th-century tower house, about 4 miles (6.4 km) east of Dalkeith, East Lothian, Scotland, and north of Ormiston Mains. It was formerly known as the "House of Ormiston" and is known alternatively as Old Ormiston. There was also a tower house called Ormiston near Innerleithen, and one called Ormiston Tower near Kelso, both in Scottish Borders.