Treforest is a village in the south-east of Pontypridd in the county borough of Rhondda Cynon Taf, Wales situated in the Treforest electoral ward along with the village of Glyntaff , being part of the Pontypridd Community. Treforest runs along the west bank of the River Taff while Glyntaff runs along its east bank.

Treforest extends from immediately south east of Ynysangharad Park where the A4058 link from the A470 joins the A473 Broadway , all the way to join the Tonteg ward in the south .

The village is historically connected with the Crawshay family who established a major tinplate works in 1835. Treforest is now known for its association with the University of South Wales, originally established as the School of Mines at Treforest in 1913.

Treforest Industrial Estate is not part of Treforest or its electoral ward, most of which is not even within Pontypridd. Instead this falls partly within the area of Upper Boat , but mostly within the Willowford area of Ton-Teg and Nantgarw.