Lisnaskea is the second-biggest settlement in County Fermanagh, Northern Ireland. It is situated mainly in the townland of Lisoneill, with some areas in the townland of Castle Balfour Demesne, both in the civil parish of Aghalurcher and the historic barony of Magherastephana. It had a population of 3,020 people at the 2021 Census.

County Fermanagh is one of the thirty-two counties of Ireland, one of the nine counties of Ulster and one of six counties of Northern Ireland