Pettigo, also spelt Pettigoe, is a small village and townland on the border of County Donegal, Republic of Ireland, and County Fermanagh, Northern Ireland. It is bisected by the Termon River which is part of the border between the Republic of Ireland and Northern Ireland.

County Donegal is a county of Ireland in the province of Ulster and in the Northern and Western Region. It is named after the town of Donegal in the south of the county. It has also been known as County Tyrconnell or Tirconaill, after the historic territory. Donegal County Council is the local council and Lifford is the county town.