Cumberland Lake (formally Pine Island Lake) is a glacial lake in the Canadian province of Saskatchewan. It is situated in the Cumberland Delta in east-central Saskatchewan about 60 kilometres (37 mi) from the Manitoba border. Cumberland House and Cumberland House Provincial Historic Park are on the south shore of the lake on Cumberland Island. Access to the lake and its amenities is from Highway 123.

Cumberland Lake was an interior hub for three canoe routes travelled by Voyageurs during the fur trade era. The lake gave access to the Saskatchewan River for travel west and south-west, the Sturgeon-Weir River for access north-west to the Churchill River system (and Lake Athabasca), and the Grass River which lead north-east towards York Factory.

The lake supports a variety of fish species. These include walleye, sauger, yellow perch, northern pike, lake whitefish, goldeye, mooneye, white sucker, shorthead redhorse, longnose sucker, lake sturgeon, and burbot.

• List of lakes of Saskatchewan