| Country: | Wales |
| Official Name: | Cefnddwysarn |
| Coordinates: | 52.934°N -3.54°W |
| Static Image Name: | Entering Cefn-ddwysarn (geograph 3393721).jpg |
| Static Image Caption: | Entering Cefnddwysarn |
| Community Wales: | Llandderfel |
| Unitary Wales: | Gwynedd |
| Constituency Welsh Assembly: | Dwyfor Meirionnydd |
| Constituency Westminster: | Dwyfor Meirionnydd |
| Post Town: | BALA |
| Postcode District: | LL23 |
| Postcode Area: | LL |
| Dial Code: | 01678 |
| Os Grid Reference: | SH965385 |
Cefnddwysarn is a small village in Gwynedd, Wales.
It is located on the A494 road approximately 3 miles east of the town of Bala and 8 miles west of Corwen. The village is situated within the traditional county of Merionethshire, and the community of Llandderfel.