| Petosse | |
| Commune Status: | Commune |
| Arrondissement: | Fontenay-le-Comte |
| Canton: | La Châtaigneraie |
| Insee: | 85174 |
| Postal Code: | 85570 |
| Mayor: | Yves-Marie Boucher[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays de Fontenay-Vendée |
| Coordinates: | 46.4814°N -0.9081°W |
| Elevation Min M: | 20 |
| Elevation Max M: | 58 |
| Area Km2: | 15.90 |
Petosse (in French pronounced as /pətɔs/) is a commune in the Vendée department in the Pays de la Loire region in western France.