Cilybebyll (/ˌkɪləˈbɛbɪl/) is a village and community in the Neath Port Talbot County Borough, Wales.

[3] The Cilybebyll estate was established in the 15th century,[4] and after development by various families, by 1838 was recorded as having the largest land holding in the district.

Plas Cilybebyll, the main house, was redeveloped in 1840 by Henry Leach, creating a south-facing Victorian facade on the property.

In 1858, 14 men and boys died as a result of engine fumes being accidentally pumped into the Primrose Colliery.

Parallel inquiries into the causes of the disaster were launched by South Wales Police and the Health and Safety Executive.