| Drefféac | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Drefféac (Loire-Atlantique).svg |
| Arrondissement: | Saint-Nazaire |
| Canton: | Pontchâteau |
| Insee: | 44053 |
| Postal Code: | 44530 |
| Mayor: | Philippe Jouny[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays de Pont-Château - Saint-Gildas-des-Bois |
| Coordinates: | 47.4772°N -2.055°W |
| Elevation Min M: | 0 |
| Elevation Max M: | 33 |
| Area Km2: | 14.16 |
Drefféac (in French pronounced as /dʁefeak/; Gallo: D·rfé, Breton: Devrieg) is a commune in the Loire-Atlantique department in western France.