Comencho Lake is a body of water in the Broadback River watershed in the Eeyou Istchee James Bay (municipality) area within the Nord-du-Québec, in the province of Quebec, in Canada.

The nearest road is located at 48.1 kilometres (29.9 mi) south of the lake, which is route 113 (connecting Lebel-sur-Quévillon and Chibougamau) and the railroad of Canadian National Railway.

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

Nevertheless, the graph of the current hydronym is a modification of Comenscocho and Comenscacho; the first dating back at least to 1931, being indicated on a plan of survey.

[2] The toponym "lake Comencho" was officialized on December 5, 1968, by the Commission de toponymie du Québec, when it was created.