Lac de Gras

Infobox_lake
lake_name = Lac de Gras
image_lake =
caption_lake =
image_bathymetry =
caption_bathymetry =
location = Northwest Territories
coords = coord|64|30|N|110|30|W|region:CA_type:waterbody|display=inline,title
type =
inflow =
outflow = Coppermine River
catchment =
basin_countries = Canada
length = 60 km
width = 16 km
area =
depth =
max-depth = 56 m
volume =
residence_time =
shore = 740 km
elevation =
islands =
cities =

Lac de Gras is a lake approximately 300 km north of Yellowknife, Northwest Territories, Canada. Lac de Gras was the centre of the Canadian diamond rush of the 1990s. There are two working diamond mines in the area, Ekati Diamond Mine, and Diavik Diamond Mine.

It was called Ekati by aboriginal peoples. It is 60 kilometres long, with an average width of 16 kilometres and 740 kilometres of shoreline. It has a maximum depth of 56 metres. Native fish species include lake trout, cisco, common whitefish, arctic grayling, burbot, longnose sucker, and slimy sculpin.