| Country: | Wales |
| Official Name: | Penllwyn |
| Coordinates: | 52.4062°N -3.9831°W |
| Cardiff Distance Mi: | 72.5 |
| Cardiff Distance Km: | 116.7 |
| London Distance Mi: | 175.4 |
| London Distance Km: | 282.3 |
| Unitary Wales: | Ceredigion |
| Community Wales: | Melindwr |
| Constituency Welsh Assembly: | Ceredigion |
| Constituency Westminster: | Ceredigion Preseli |
| Post Town: | Aberystwyth |
| Postcode District: | SY23 |
| Postcode Area: | SY |
| Os Grid Reference: | SN 6519 8054 |
Pen-llwyn is a hamlet in the community of Melindwr, Ceredigion, Wales, which is 72.5 miles (116.7 km) from Cardiff and 175.4 miles (282.3 km) from London. Penllwyn is represented in the Senedd by Elin Jones (Plaid Cymru) and is part of the Ceredigion constituency in the House of Commons.[1] [2]
The name derives from the welsh language meaning "the head of the grove".