The Du Tast Lake is a freshwater body of the municipality of Eeyou Istchee James Bay, in the administrative region of Nord-du-Québec, in the province of Quebec, at Canada.

The surface of the lake is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.

The "Lake Du Tast" receives on the Southwest side the waters of the Kauskatitineu River and some streams coming from the North-West.

The Atikuschekw Marsh is located on the northwestern side of the northern part of "Lake Du Tast".

This confluence with this latter lake is located at 2.5 kilometres (1.6 mi) west of the mouth of Kaitupscheyau Creek.