| Coordinates: | 51.4752°N -3.4801°W |
| Country: | Wales |
| Official Name: | Penllyn |
| Welsh Name: | Pen-llin |
| Community Wales: | Penllyn |
| Unitary Wales: | Vale of Glamorgan |
| Lieutenancy Wales: | South Glamorgan |
| Constituency Westminster: | Vale of Glamorgan |
| Constituency Welsh Assembly: | Vale of Glamorgan |
| Post Town: | Cowbridge |
| Postcode Area: | CF |
| Postcode District: | CF71 |
| Dial Code: | 01446 |
| Os Grid Reference: | SS973761 |
| Population: | 1506 |
| Population Ref: | (2011)[1] |
Penllyn (Welsh: Pen-llin) is a village and community in the Vale of Glamorgan, Wales. It is located north west of the market town of Cowbridge. As a community it contains the settlements of Llansannor, Pentre Meyrick, Trerhyngyll, Ystradowen and Penllyn itself.[2]
Penllyn is home to Penllyn Castle, a 12th-century fortification which, although ruinous, is now adjoined by a castellated mansion originally built in the late 16th century.
The smaller hamlet of Graig Penllyn, about 1.3mile north of the main village, is notable for its pub the Barley Mow.[3] [4]