The Jean-Pierre Bay is a freshwater body of the south-eastern part of the Gouin Reservoir, in the territory of the town of La Tuque, in Haute-Mauricie, in the administrative region of Mauricie, in the province of Quebec, in Canada.

Since 1948, Jean-Pierre Bay has been an extension of the Brochu Lake further north-west, at the extreme east of the Gouin Reservoir.

The route 400, connecting the Gouin Dam to the village of Parent, Quebec, serves the southern part of Jean-Pierre Bay, as well as the river valleys Jean-Pierre and Leblanc; this road also serves the peninsula which stretches north in the Gouin Reservoir on 30.1 kilometres (18.7 mi).

Some secondary forest roads are in use nearby for forestry and recreational tourism activities.

The toponym "Baie Jean-Pierre" was officialized on August 2, 1991 by the Commission de toponymie du Québec.