| Marsais-Sainte-Radégonde | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Marsais-Sainte-Radégonde 85.svg |
| Arrondissement: | Fontenay-le-Comte |
| Canton: | La Châtaigneraie |
| Insee: | 85137 |
| Postal Code: | 85570 |
| Mayor: | Marie-Thérèse Fromaget[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays de Fontenay-Vendée |
| Coordinates: | 46.5392°N -0.88°W |
| Elevation Min M: | 34 |
| Elevation Max M: | 98 |
| Area Km2: | 14.77 |
Marsais-Sainte-Radégonde is a commune in the Vendée department in the Pays de la Loire region in western France.
The river Smagne forms all of the commune's northern border.