Miller Lake is a body of freshwater located in the western part of the Gouin Reservoir, in the territory of the town of La Tuque, in the administrative region of the Mauricie, in the province of Quebec, in Canada.

The surface of Miller Lake is usually frozen from mid-November to the end of April, however, safe ice circulation is generally from early December to late March.

The southern part of Miller Lake is bounded by the north end of a peninsula that runs northward on 6.6 kilometres (4.1 mi).

A narrow bay stretches 1.1 kilometres (0.68 mi) north, more or less parallel to the outlet of Lacasse Lake (Gouin Reservoir).

The French toponym "lac Miller" was formalized on 5 décembre 1968 by the Commission de toponymie du Québec, e.g. at its creation.