| Saint-Senier-sous-Avranches | |
| Commune Status: | Commune |
| Arrondissement: | Avranches |
| Canton: | Isigny-le-Buat |
| Insee: | 50554 |
| Postal Code: | 50300 |
| Mayor: | Lyne Delaunay[1] |
| Term: | 2022 - 2026 |
| Intercommunality: | CA Mont-Saint-Michel-Normandie |
| Coordinates: | 48.6853°N -1.34°W |
| Elevation M: | 80 |
| Elevation Min M: | 7 |
| Elevation Max M: | 126 |
| Area Km2: | 8.62 |
Saint-Senier-sous-Avranches (pronounced as /fr/, literally Saint Senier under Avranches) is a commune in the Manche department in Normandy in north-western France.[2]