| Lac de Grandval | |
| Location: | Cantal |
| Pushpin Map: | France Auvergne-Rhône-Alpes |
| Coords: | 44.9206°N 3.1133°W |
| Type: | Reservoir |
| Inflow: | Truyère, Bès,l'Ander |
| Outflow: | Truyère |
| Basin Countries: | France |
| Area: | 11km2 |
| Max-Depth: | 79m (259feet) |
| Elevation: | 742m (2,434feet) |
Lac de Grandval is a reservoir lake in Cantal, France. At an elevation of 742 m, its surface area is 11 km2.
The lake lies in the communes of Alleuze, Faverolles and Fridefont; at its western end is the hydroelectric dam by the name of Barrage de Grandval, between Lavastrie and Fridefont. The lake hosts a temperate oceanic climate.[1]