Castle Balfour Demesne is a townland of 201 acres in County Fermanagh, Northern Ireland. It is situated in the civil parish of Aghalurcher and the historic barony of Magherastephana. It contains part of the small town of Lisnaskea, with the remainder in the townland of Lisoneill. The townland contains the 17th-century remains of Castle Balfour, just off the main street in Lisnaskea, built around 1618 by James, Lord Balfour of Glenawley. The castle was altered in 1652 and damaged in 1689, but remained inhabited into the 19th century. It was restored and conserved in the 1960s and 1990s.