Slieve Coillte (from Irish: Sliabh Coiltair, meaning 'mountain of Coltar') is a hill in the south of County Wexford, Ireland. The hill is the highest point on the Hook peninsula, with an elevation of 268.5 metres (881 ft). Villages around Slieve Coillte include New Ross, Slaught, Cassagh, , Campile, and Duncannon. On a good day the whole of the Hook peninsula can be overseen, up to the 12th Century Hook lighthouse on Hook Head, one of the oldest operational lighthouses in the world.