| Chantonnay | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Chantonnay (Vendée).svg |
| Arrondissement: | La Roche-sur-Yon |
| Canton: | Chantonnay |
| Insee: | 85051 |
| Postal Code: | 85110 |
| Mayor: | Isabelle Moinet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays de Chantonnay |
| Coordinates: | 46.6878°N -1.0494°W |
| Elevation Min M: | 18 |
| Elevation Max M: | 112 |
| Area Km2: | 82.91 |
Chantonnay (pronounced as /fr/) is a commune in the Vendée department in the Pays de la Loire region in western France.
The river Lay flows southwestward through the commune and forms part of its eastern and southern borders.
Chantonnay has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Chantonnay is . The average annual rainfall is with November as the wettest month. The temperatures are highest on average in July, at around, and lowest in January, at around . The highest temperature ever recorded in Chantonnay was on 27 June 2019; the coldest temperature ever recorded was on 15 February 1956.