Rhondda Cynon Taf (RCT; Welsh: Rhondda Cynon Taf) is a county borough in the preserved county of Mid Glamorgan, south Wales.
The district borders Merthyr Tydfil and Caerphilly to the east, Cardiff and the Vale of Glamorgan to the south, Bridgend and Neath Port Talbot to the west and Powys to the north. Its main towns are Aberdare, Mountain Ash and Pontypridd.
See List of places in Rhondda Cynon Taf for a list of towns and villages.

Chris Bryant
Ann Clwyd
Kim Howells
Huw Irranca-Davies Industry
The Coal industry has had major adverse impacts on the quality of the environment such that most of the rivers were severely polluted to the exclusion of all fish life. Recent decades have shown great improvement with Salmon recorded from the River Taff and the River Rhondda but the continued presence of man-made obstacles in the rivers is inhibiting their return to their pre-industrial condition.
The chemical industry has also had adverse effects due to the dumping of toxic waste in the now disused Brofiscin Quarry in the village of Groesfaen. Dumping took place over a 7 year period between 1967 and 1973 by Monsanto. It is estimated that the cleanup costs could be more than £100 million. A Dr Papageorge, formerly Monsanto's chief scientist, estimates that between 60,000 and 80,000 tonnes of PCB contaminated wastes were dumped there.

Government
Rhondda Cynon Taf is twinned with the city of Nürtingen, Baden-Württemberg (Germany)