| Chasnais | |
| Commune Status: | Commune |
| Arrondissement: | Fontenay-le-Comte |
| Canton: | Luçon |
| Insee: | 85058 |
| Postal Code: | 85400 |
| Mayor: | Gérard Praud[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 46.4606°N -1.2283°W |
| Elevation Min M: | 0 |
| Elevation Max M: | 30 |
| Area Km2: | 10.77 |
Chasnais (in French pronounced as /ʃanɛ/) is a commune of the Vendée department in the Pays de la Loire region in western France.