| Tréguennec | |
| Native Name: | Tregeneg |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Tréguennec (Finistère).svg |
| Coordinates: | 47.8922°N -4.3322°W |
| Elevation Min M: | 0 |
| Elevation Max M: | 53 |
| Insee: | 29292 |
| Postal Code: | 29720 |
| Arrondissement: | Quimper |
| Canton: | Plonéour-Lanvern |
| Mayor: | Stéphane Morel[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays Bigouden Sud |
| Area Km2: | 9.61 |
Tréguennec (in French pronounced as /tʁeɡɛnɛk/;) is a commune in the Finistère department of Brittany in north-western France.
Inhabitants of Tréguennec are called in French Tréguennecois.
The Chapelle de Saint-Vio is named after Saint Vouga.