| Frossay | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Frossay (Loire-Atlantique).svg |
| Arrondissement: | Saint-Nazaire |
| Canton: | Saint-Brevin-les-Pins |
| Insee: | 44061 |
| Postal Code: | 44320 |
| Mayor: | Sylvain Scherer[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Sud-Estuaire |
| Coordinates: | 47.245°N -1.9331°W |
| Elevation Min M: | 0 |
| Elevation Max M: | 47 |
| Area Km2: | 57.22 |
Frossay (in French pronounced as /fʁɔsɛ/; Gallo: Froczaè, Breton: Frozieg) is a commune in the Loire-Atlantique department in western France.