Thomastown Welsh: Tretomas
Thomastown Location within Rhondda Cynon Taf
OS grid reference	ST 0047 8723
Community	Tonyrefail
Principal area	Rhondda Cynon Taf
Preserved county	Mid Glamorgan
Country	Wales
Sovereign state	United Kingdom
Post town	Porth
Postcode district	CF39
Dialling code	01443
Police	South Wales
Fire	South Wales
Ambulance	Welsh
UK Parliament	Pontypridd
List of places UK Wales Rhondda Cynon Taf 51°34′30″N 3°26′15″W / 51.575090°N 3.43762°W / 51.575090; -3.43762

Thomastown (Welsh: Tretomas) is a village and district of the large community of Tonyrefail, within Rhondda Cynon Taf, South Wales. It is located to the south of Tonyrefail within the 'Tonyrefail West' electoral ward, and falls within the Ely Valley along the A4119.

Thomastown is also a community ward for elections to Tonyrefail & District Community Council.^[1]