Dowlais is a village and community of the county borough of Merthyr Tydfil, in Wales. At the 2011 census the electoral ward had a population of 6,926, The population of the Community being 4,270 at the 2011 census having excluded Pant. Dowlais is notable within Wales and Britain for its historic association with ironworking; once employing, through the Dowlais Iron Company, over 7,000 people, the works being the largest in the world at one stage.

Merthyr Tydfil County Borough is a county borough in the south-east of Wales. In mid 2018, it had an estimated population of 60,183 making it the smallest local authority in Wales by both population and land area. It is located in the historic county of Glamorgan and takes its name from the town with the same name. The county borough consists of the northern part of the Taff Valley and the smaller neighbouring Taff Bargoed Valley. It borders the counties of Rhondda Cynon Taf to the west, Caerphilly County Borough to the east, and Powys to the north.