| Official Name: | Thomastown |
| Country: | Wales |
| Static Image: | Nant Melyn Terrace, Thomastown - geograph.org.uk - 415011.jpg |
| Os Grid Reference: | ST 0047 8723 |
| Coordinates: | 51.5751°N -3.4376°W |
| Post Town: | Porth |
| Postcode Area: | CF |
| Postcode District: | CF39 |
| Dial Code: | 01443 |
| Constituency Westminster: | Pontypridd |
| Welsh Name: | Tretomas |
| Community Wales: | Tonyrefail |
| Unitary Wales: | Rhondda Cynon Taf |
| Lieutenancy Wales: | Mid Glamorgan |
Thomastown (cy|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]