Cwm Clydach is a community and electoral ward to the northwest of Tonypandy in Rhondda Cynon Taf, Wales.

[1] 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.

[2] Prior to the arrival of industrialisation in the mid 1800s, the valley comprised part of the farms of Blaen Clydach, Pwllyrhebog, Ffynnon-dwym, and Penpant Clydach.

[3] The electoral ward of Cwm Clydach is coterminous with the boundaries of the community.

Since the formation of Rhondda Cynon Taf in 1995 it has elected a county councillor to sit on Rhondda Cynon Taf County Borough Council.