The Grandval Dam (French: barrage de Grandval, in French pronounced as /baʁaʒ də ɡʁɑ̃val/) is a dam in the French region Massif central, which opened in 1960. It was conceived by architects Henri et Louis Marty. It is located on the Truyère river, in the departement of Cantal, in between the communes of Fridefont et de Lavastrie.
| Grandval Dam | |
| Name Official: | Barrage de Grandval |
| Coordinates: | 44.9224°N 3.0747°W |
| Country: | France |
| Location: | Lavastrie |
| Construction Began: | 1955 |
| Opening: | 1960 |
| Dam Height Foundation: | 88m |
| Dam Height Thalweg: | 76m |
| Dam Length: | 376m |
| Dam Volume: | 271m3 |