Cyrille Vaillancourt CBE (January 17, 1892 – October 30, 1969) was a journalist, civil servant, businessman and political figure in Quebec.
Vaillancourt played an important role in the development of the caisses populaires in Quebec.
He was born in Saint-Anselme, Quebec, the son of Cyrille-Émile Vaillancourt and Marie-Louise Larochelle, and was educated at the Collège de Lévis and the Université Laval.
Vaillancourt worked for the Étoile du Nord at Joliette before serving in the Quebec Department of Agriculture, responsible for the areas of beekeeping and maple syrup production.
From 1927 to 1963, he was general manager for the regional federation of caisses populaires for Quebec district.