Lac de Malsaucy is a lake in the Territoire de Belfort, Franche-Comté, France. The lake with a surface of is 0.64 km2 shared by three communes: Evette-Salbert, Lachapelle-sous-Chaux and Sermamagny.

Lac du Malsaucy
Eurockéennes held in July at the lake
Lac du Malsaucy is located in Bourgogne-Franche-Comté
Lac du Malsaucy
Lac du Malsaucy
LocationTerritoire de Belfort, Bourgogne-Franche-Comté
Coordinates47°41′10″N 6°48′5″E / 47.68611°N 6.80139°E / 47.68611; 6.80139
Basin countriesFrance
Max. length1.5 km (0.93 mi)
Max. width0.5 km (0.31 mi)
Surface area64 ha (160 acres)
Max. depth27 meters (89 ft)

The rock festival Eurockéennes is held each July on an isthmus on the lake.