Saint-Jean-de-Dieu is an unconstituted locality in Quebec, Canada within a larger municipality also named Saint-Jean-de-Dieu. It is recognized as a designated place by Statistics Canada.
In the 2021 Census of Population conducted by Statistics Canada, Saint-Jean-de-Dieu had a population of 1,027 living in 447 of its 471 total private dwellings, a change of from its 2016 population of 987. With a land area of , it had a population density of in 2021.