Lake Maicasagi is a body of freshwater located in the territory of Eeyou Istchee Baie-James (municipality), in the administrative region of Nord-du-Québec, in the province of Quebec, in Canada.

The other access road is located on the east side and passes on the south side of Goéland Lake (Waswanipi River), and then ascends northward across the Waswanipi River.

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

The mouth of Lake Maicasagi is located at the bottom of a bay in the Southwest Passage Max.

This mouth is located at: The main hydrographic slopes near Lac Maicasagi are: The toponym "Lake Maicasagi" was officialized on December 5, 1968 by the Commission de toponymie du Québec, when it was created.