Aughanduff (from Irish Áth an Daimh 'ford of the oxen') is a small village and townland in the civil parish of Forkhill, in the former barony of Orior Upper, and County of Armagh, Northern Ireland. The townland is roughly co-existent with Upper and Lower Aughanduff Mountains, both of which form part of the Ring of Gullion geological formation, which has been described as the most spectacular example of a ring-dyke intrusion in the British Isles, and was the first ring dyke in the world to be geologically mapped. Aughanduff has been populated since prehistoric times and has been recorded as a distinct district since at least the early 1600s. The area's history is both well documented and reflects its location both in rural Ireland and on the borderlands of the Pale, the Plantation of Ulste