The Adolphe-Poisson Bay is a freshwater body located south of the southwestern part of the Gouin Reservoir, in the territory of the town of La Tuque, in the administrative region of Mauricie, in the province of Quebec, in Canada.

This lake extends almost entirely in Poisson Township (southern part), except for the strait passing to the northeast of the large island blocking the mouth of the bay which is situated in the canton of Hanotaux.

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

Monseigneur Camille Roy (1940) writes that Poisson was "an official at Arthabaska, (now an area of the city of Victoriaville) where since 1874 he has been a member of use of receiver at registration...".

The toponym "Baie Adolphe-Poisson" was formalized on March 10, 1970, by the Commission de toponymie du Québec, when it was created.