Lake Nisramont (French: lac de Nisramont) is located in Wallonia in the south-east of Belgium on the river Ourthe in the municipality of La Roche-en-Ardenne, province of Luxembourg.

It is named after Nisramont, a village near the lake.

The volume of water is 3,000,000 m3 and the area of the lake is 0.47 km2.

The dam has fish ladders and a hydro-electric power station.

The lake is a tourist attraction, with water sports, including canoeing and fishing.