| Country: | Wales |
| Official Name: | Aberdesach |
| Coordinates: | 53.036°N -4.348°W |
| Static Image Name: | Aberdesach MMB 05.jpg |
| Static Image Caption: | Looking out to sea from the beach at Aberdesach |
| Community Wales: | Clynnog |
| Unitary Wales: | Gwynedd |
| Constituency Welsh Assembly: | Dwyfor Meirionnydd |
| Constituency Westminster: | Dwyfor Meirionnydd |
| Post Town: | CAERNARFON |
| Postcode District: | LL54 |
| Postcode Area: | LL |
| Dial Code: | 01286 |
| Os Grid Reference: | SH425514 |
Aberdesach is a small village in a primarily Welsh speaking area of Gwynedd. It is in the historic county of Caernarfonshire. The village is situated approximately 1.5 miles south of the neighbouring village of Pontllyfni and 6 miles south of the county town of Caernarfon.