| Country: | Wales |
| Coordinates: | 52.91°N -4.547°W |
| Official Name: | Llandudwen |
| Static Image Name: | Looking SW to Carn Fadryn from Bronheulog - geograph.org.uk - 269567.jpg |
| Static Image Width: | 250 |
| Static Image Caption: | Carn Fadryn seen from Bronheulog |
| Unitary Wales: | Gwynedd |
| Lieutenancy Wales: | Gwynedd |
| Constituency Welsh Assembly: | Dwyfor Meirionnydd |
| Constituency Westminster: | Caernarfon |
| Community Wales: | Buan |
| Postcode District: | LL53 |
| Postcode Area: | LL |
| Post Town: | PWLLHELI |
| Dial Code: | 01758 |
| Os Grid Reference: | SH2837 |
Llandudwen is a former civil parish in the Welsh county of Gwynedd. It was abolished in 1934, and divided between Buan and Tudweiliog.[1]