The ZEC du Lac-Brébeuf is a "zone d'exploitation contrôlée" (controlled harvesting zone) (ZEC) of 434 square kilometres (168 sq mi), located partly in the unorganized territory Lalemant, in the MRC Le Fjord-du-Saguenay Regional County Municipality and also in the MRC Charlevoix-Est Regional County Municipality, in the administrative region of Saguenay-Lac-Saint-Jean, in Quebec, in Canada.

The docking station is 3 kilometers from the church of Saint-Félix-d'Otis, following the route du Lac-Brébeuf.

In this Zec, fishing enthusiasts take mostly brook (char or fountain), the lake trout and the eel.

Furthermore, hunting is popular for small animal (hare, grouse), the american black bear and the mousel.

Previously, the lake was designated "Little Lake St. John", the Commission de toponymie du Québec (Geographical Names Board of Quebec) which refers to a 1925 publication.