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.

This Cantal geographical article is a stub.