| Fontenay-sur-Mer | |
| Commune Status: | Commune |
| Arrondissement: | Cherbourg |
| Canton: | Valognes |
| Insee: | 50190 |
| Postal Code: | 50310 |
| Mayor: | Philippe Anne[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Cotentin |
| Coordinates: | 49.49°N -1.3142°W |
| Elevation Min M: | 1 |
| Elevation Max M: | 43 |
| Area Km2: | 8.18 |
Fontenay-sur-Mer (pronounced as /fr/, literally Fontenay on Sea) is a commune in the Manche department in north-western France.