Haidersee
Haidersee
Location	South Tyrol
Coordinates	46°45′16″N 10°31′55″E / 46.75444°N 10.53194°E / 46.75444; 10.53194
Primary inflows	Adige, Zerzerbach
Catchment area	33.97 km2 (13.12 sq mi)
Basin countries	Italy
Surface area	89 ha (220 acres)
Average depth	6.7 m (22 ft)
Max. depth	15 m (49 ft)
Water volume	6,000,000 m3 (0.0014 cu mi)
Shore length1	4.5 km (3 mi)
Surface elevation	1,450 m (4,757 ft)
Settlements	Graun im Vinschgau
1 Shore length is not a well-defined measure.

The Haidersee (Italian: Lago di San Valentino alla Muta) is a lake in South Tyrol, Italy, which belongs to the municipality of Graun im Vinschgau.

• Civic Network of South Tyrol (in German and Italian)