| Castilly | |
| Arrondissement: | Bayeux |
| Canton: | Trévières |
| Insee: | 14142 |
| Postal Code: | 14330 |
| Commune: | Isigny-sur-Mer |
| Coordinates: | 49.2711°N -1.0228°W |
| Elevation M: | 40 |
| Elevation Min M: | 4 |
| Elevation Max M: | 64 |
| Area Km2: | 12.2 |
| Population: | 309 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Castilly (in French pronounced as /kastiji/) is a former commune in the Calvados department in the Normandy region in northwestern France. On 1 January 2017, it was merged into the commune Isigny-sur-Mer.[2]