Maupertus-sur-Mer
Commune
The church of Saint-Martin
Location of Maupertus-sur-Mer
Maupertus-sur-Mer Show map of France Maupertus-sur-Mer Show map of Normandy
Coordinates: 49°39′30″N 1°29′00″W / 49.6583°N 1.4833°W / 49.6583; -1.4833
Country	France
Region	Normandy
Department	Manche
Arrondissement	Cherbourg
Canton	Val-de-Saire
Intercommunality	CA Cotentin
Government
• Mayor (2020–2026)	Thierry Gervaise[1]
Area 1	3.42 km2 (1.32 sq mi)
Population  (2021)[2]	221
• Density	65/km2 (170/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	50296 /50330
Elevation	0–152 m (0–499 ft) (avg. 119 m or 390 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

Maupertus-sur-Mer (French pronunciation: [mopɛʁty syʁ mɛʁ], literally Maupertus on Sea) is a commune in the Manche department in Normandy in north-western France.