Cilybebyll /ˌkɪləˈbɛbɪl/ is a village and community in Neath Port Talbot County Borough in Wales. It includes the villages of Alltwen, Fforest Gôch, Gellinudd and Rhos, and is located 1.9 miles (3.1 km) east of Pontardawe, 4.7 miles (7.6 km) north of Neath and 10.3 miles (16.6 km) north east of Swansea. The community has a population of 4,806.