Lac-Delage (French pronunciation: [lak dəlaʒ]) is a town in the Capitale-Nationale region of Quebec, Canada, located on the eponymous Lake Delage.

In the 2021 Census of Population conducted by Statistics Canada, Lac-Delage had a population of 771 living in 308 of its 316 total private dwellings, a change of 20.8% from its 2016 population of 638.

With a land area of 1.58 km2 (0.61 sq mi), it had a population density of 488.0/km2 (1,263.8/sq mi) in 2021.

[5] Mother tongue: Lac-Delage forms part of the federal electoral district of Portneuf—Jacques-Cartier and has been represented by Joël Godin of the Conservative Party since 2015.

Provincially, Lac-Delage is part of the Chauveau electoral district and is represented by Sylvain Lévesque of the Coalition Avenir Québec since 2018.