Aberdare is a town in the Cynon Valley area of Rhondda Cynon Taf, Wales, at the confluence of the Rivers Dare (Dâr) and Cynon. Aberdare has a population of 39,550. Aberdare is 4 miles (6 km) south-west of Merthyr Tydfil, 20 miles (32 km) north-west of Cardiff and 22 miles (35 km) east-north-east of Swansea. During the 19th century it became a thriving industrial settlement, which was also notable for the vitality of its cultural life and as an important publishing centre.

Cynon Valley is a former coal mining valley in Wales. It lies between Rhondda and the Merthyr Valley and takes its name from the River Cynon. Aberdare is located in the north of the valley and Mountain Ash in the south. From 1974 to 1996, Cynon Valley was a local government district.