| Marcilly | |
| Commune Status: | Commune |
| Arrondissement: | Avranches |
| Canton: | Pontorson |
| Insee: | 50290 |
| Postal Code: | 50220 |
| Mayor: | Bruno Léon[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Mont-Saint-Michel-Normandie |
| Coordinates: | 48.6486°N -1.2508°W |
| Elevation M: | 21 |
| Elevation Min M: | 17 |
| Elevation Max M: | 163 |
| Area Km2: | 8.86 |
| Demonym: | Marcillais |
Marcilly (in French pronounced as /maʁsiji/) is a commune in the Manche department in Normandy in north-western France.