| Maupertus-sur-Mer | |
| Commune Status: | Commune |
| Arrondissement: | Cherbourg |
| Canton: | Val-de-Saire |
| Insee: | 50296 |
| Postal Code: | 50330 |
| Mayor: | Thierry Gervaise[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Cotentin |
| Coordinates: | 49.6583°N -1.4833°W |
| Elevation M: | 119 |
| Elevation Min M: | 0 |
| Elevation Max M: | 152 |
| Area Km2: | 3.42 |
Maupertus-sur-Mer (in French pronounced as /mopɛʁty syʁ mɛʁ/, literally Maupertus on Sea) is a commune in the Manche department in Normandy in north-western France.