L'Assomption Lake (in French: Lac de l'Assomption) is a lake located in the Mont-Tremblant National Park (sector of L'Assomption), in the Municipality of Saint-Guillaume-Nord, in Matawinie Regional County Municipality, in the administrative region of Lanaudière, in Quebec, in Canada.

The lake is surrounded by a cycle path made of rock dust over a distance of seven kilometers.

[1] The toponym "Lac de L'Assomption" was formalized on December 5, 1968, at the Place name bank of the Commission de toponymie du Québec.

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