Lake Ouescapis is a freshwater body of the Broadback River watershed in the Municipality of Eeyou Istchee Baie-James (municipality), in the Administrative Region of Nord-du-Québec, in Quebec, in Canada.
Forestry is the main economic activity of the sector. Recreational tourism activities come second.
The hydrographic slope of Lake Ouescapis is accessible via the James Bay road (North-South direction) from Matagami, passing from the West of the lake.
The surface of lake Ouescapis is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.
The toponym lake Ouescapis was formalized on December 5, 1968 at the Commission de toponymie du Québec, at the creation of this commission.