Lac-Delage () is a town in the Capitale-Nationale region of Quebec, Canada, located on the eponymous Lake Delage.
The town saw its beginning in the 1950s when summer visitors came to the lake, which was originally called Lake Larron. It was renamed to Lake Delage by then Quebec Premier Maurice Duplessis in honour of Cyrille-Fraser Delâge. Duplessis also granted the development of the resort and town. On February 11, 1959, the City of Lac-Delage was incorporated out of territory ceded by the Municipality of Stoneham and the Municipality of Lac Saint-Charles.
In the 2021 Census of Population conducted by Statistics Canada, Lac-Delage had a population of living in of its total private dwellings, a change of from its 2016 population of . With a land area of , it had a population density of in 2021.
Mother tongue (2021):
Lac-Delage forms part of the federal electoral district of PortneufâÂÂJacques-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.