Cwm Clydach is a community and electoral ward to the northwest of Tonypandy in Rhondda Cynon Taf, Wales. The community and ward covers the valley of the Nant Clydach, which includes the cojoined villages of Clydach Vale and Blaenclydach. The community includes Cwm Clydach Countryside Park, created on the site of a coal mine, which has two lakes and is a haven for birds, insects and newts.