Magheraboy (from Irish machaire buí 'yellow plain'[1]) is a barony in County Fermanagh, Northern Ireland.

[2][3] To its east lies Lower Lough Erne, and it is bordered by three other baronies in Northern Ireland: Lurg to the north; Tirkennedy to the east; and Clanawley to the south[2] It also borders two baronies in the Republic of Ireland: Tirhugh to the north; and Rosclogher to the south.

[5][4] The O'Flanagans were an important medieval family based at Ballyflanagan (present day townland of Aghamore) in Magheraboy, and they once controlled the entire western side of Lower Lough Erne from Belleek to Belmore Mountain.

[5] The O'Flanagans were related to the ruling family of the Uí Néill kingdom of Cairbre Droma Cliabh.

[1] Another small sept of the Uí Néill, the Cenél Láegaire, settled in Magheraboy in the early Christian period.