Oneilland East (from Irish: Uí Nialláin, the name of an ancient Gaelic district) is a barony in the north-east of County Armagh, Northern Ireland. It is also called Clanbrasil (from Clann Bhreasail, "offspring of Breasal"). It lies in the north-east corner of the county, on the south-eastern shore of Lough Neagh and the boundary with County Down. Oneilland East is bordered by three other baronies: Oneilland West to the west; Iveagh Lower to the east; and Orior Lower to the south.