| Country: | Wales |
| Coordinates: | 52.92°N -4.218°W |
| Official Name: | Penllyn |
| Static Image Name: | Cromlech Caer-dyni Burial Chamber - geograph.org.uk - 713416.jpg |
| Static Image Width: | 250 |
| Static Image Caption: | Cromlech Caer-dyni |
| Unitary Wales: | Gwynedd |
| Lieutenancy Wales: | Gwynedd |
| Constituency Welsh Assembly: | Dwyfor Meirionnydd |
| Constituency Westminster: | Caernarfon |
| Community Wales: | Criccieth |
| Postcode District: | LL52 |
| Postcode Area: | LL |
| Post Town: | CRICCIETH |
| Dial Code: | 01766 |
| Os Grid Reference: | SH5138 |
Penllyn is a former civil parish in the Welsh county of Gwynedd. The parish was created in 1894 from the part of Criccieth parish that lay outside the ancient borough. It was abolished in 1934, and divided between Llanystumdwy and Criccieth.[1] The area gives its name to a special stage used during the 2013 Wales Rally GB.