| Saint-Denis-le-Gast | |
| Commune Status: | Commune |
| Arrondissement: | Coutances |
| Canton: | Quettreville-sur-Sienne |
| Insee: | 50463 |
| Postal Code: | 50450 |
| Mayor: | Bernard Boscher[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Coutances Mer et Bocage |
| Coordinates: | 48.9408°N -1.3283°W |
| Elevation M: | 112 |
| Elevation Min M: | 29 |
| Elevation Max M: | 123 |
| Area Km2: | 16.73 |
Saint-Denis-le-Gast (in French pronounced as /sɛ̃ dəni lə ɡa/) is a commune in the Manche department in Normandy in north-western France.[2]