The lac Archambault is a lake located at Saint-Donat, in the Matawinie Regional County Municipality, in Lanaudière, in Quebec, Canada.

The shores all around Lake Archambault are highly renowned for vacationing, particularly because of the forest, mountain environment, recreational tourism, road access and its position south of the Mont-Tremblant National Park.

The main neighboring hydrographic slopes are: Lake Archambault takes the form of a zigzag (north–south orientation) becoming narrower in the southern bay.

More plausible, however, and better documented, appears the attribution, as for the canton, of the patronymic of the notary Louis Archambeault or Archambault (1814-1890), deputy, minister and legislative adviser.

Lac Archambault, listed as Archambeault in the Nomenclature of Geographical Names for the Province of Quebec in 1916, was once used for particularly intense logging in the second half of the 19th century.