| Lac de Roy | |
| Pushpin Map: | France |
| Location: | Haute-Savoie |
| Type: | Natural freshwater lake |
| Basin Countries: | France |
| Length: | 265m (869feet) |
| Width: | 155m (509feet) |
| Elevation: | 1680m (5,510feet) |
Lac de Roy is a lake in Haute-Savoie, France. It is located 2 km west of le Praz de Lys (Praz de Lys-Sommand?) ski resort, in the commune of Taninges.