Saint-Didace () is a parish municipality in the D'Autray Regional County Municipality in the Lanaudière region of Quebec, Canada.
In the 2021 Census of Population conducted by Statistics Canada, Saint-Didace 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:
Commission scolaire des Samares operates Francophone schools: