| Lac de Vallon | |
| Location: | Bellevaux, Haute-Savoie |
| Pushpin Map: | France |
| Inflow: | Brévon |
| Outflow: | Brévon |
| Basin Countries: | France |
| Area: | 15ha |
| Max-Depth: | 16m (52feet) |
| Elevation: | 1080m (3,540feet) |
| Frozen: | Winter |
Lac de Vallon is a lake at Bellevaux in the Haute-Savoie department of France. The lake formed in 1943 when a landslide blocked the course of the Brévon river.