Kilcommon (Irish: Cill Chomáin, lit.
'the church of Cuimán'[1]), is a civil parish in the ancient barony of Ballinacor South in County Wicklow, Ireland.
The core of the parish is centered on the townland and village of Tinahely.
The townland at the northern extremity is Kyle; to south it is bounded by the River Derry at Ballyshonog; to the west is the boundary with the barony of Shillelagh at Carrick; to the east lies Ballybeg at the Derry Water.
Today, the "Tinahely Carnew Union" consists of three parishes in the barony of Ballinacor South: Kilcommon, Preban (the church of St John) to the north, Kilpipe to the east of Kilcommon; it also includes the parish of Carnew (the church of All Saints) in the neighbouring barony of the Shilleagh to the south-west.