Oneilland West (from Irish Uí Nialláin, the name of an ancient Gaelic district)[2][3] is a barony in County Armagh, Northern Ireland.

[4] It is also called Clancann (Clann Chana),[5] after the Mac Cana clan.

Oneilland West is bordered by five other baronies: Armagh to the west; Dungannon Middle to the north-west; Oneilland East to the north-east; Orior Lower to the south-east; and Kinelarty to the south.

When it was split in two, Oneilland West consisted of the barony west of the River Bann, corresponding to the ancient Irish districts of Oneilland and Clancann.

This article related to the geography of County Armagh, Northern Ireland is a stub.