Lac La Blanche (French, meaning "White Lake") is a small lake located on the boundary between Mulgrave-et-Derry and Mayo, Quebec, Canada.

A 20.52 square kilometres (7.92 sq mi) area between its eastern shores and Lac Britannique (Britannia Lake) is protected in the Forêt-la-Blanche Ecological Reserve.

This area contains a rare old-growth forest and many endangered plant species.

[1] Fish species: mostly Largemouth bass, Yellow Perch, Sunfish, Catfish, and trout.

This Quebec location article is a stub.