| Grimselsee Lake Grimsel | |
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  Grimselsee Lake Grimsel  Grimselsee Lake Grimsel  Grimselsee Lake Grimsel | |
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| Location | Guttannen, Canton of Bern |
| Coordinates | 46°34′10.52″N 8°19′38.66″E / 46.5695889°N 8.3274056°E |
| Type | artificial lake, hydroelectric reservoir |
| Primary inflows | Oberaarbach, Treibtenbach |
| Primary outflows | Aare |
| Catchment area | 74.4 km2 (28.7 sq mi) |
| Basin countries | Switzerland |
| Surface area | 2.63 km2 (1.02 sq mi) |
| Water volume | 95 million cubic metres (77,000 acre⋅ft) |
| Surface elevation | 1,908 m (6,260 ft) |
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The Grimselsee or Lake Grimsel is an artificial lake near the Grimsel Pass in the Canton of Bern, Switzerland. With a volume of 95 mio m³ (20.9 billion imperial gallons, 20.1 billion US gallons), it is larger than other hydroelectric reservoirs in the Aare headwaters region: Oberaarsee, Räterichsbodensee and Gelmersee. The dam was completed in 1932 and is operated by Kraftwerke Oberhasli AG (KWO). It is located in the municipality of Guttannen.
Lake Grimsel and Räterichsbodensee in the background.