Cilybebyll is both a village and a community in the Neath Port Talbot County Borough, Wales. It includes the villages of Alltwen, Fforest Gôch, Gellinudd and Rhos. The village is located 2 miles east of Pontardawe, 5 miles north of Neath and 10 miles northeast of Swansea. The community has a population of 4,769 in 2011 census.