Blainville—Deux-Montagnes (French pronunciation: [blɛ̃vil dø mɔ̃taɲ]; formerly known as Deux-Montagnes) was a federal electoral district in Quebec, Canada, that was represented in the House of Commons of Canada from 1979 to 1997.

The electoral district was abolished in 1996, and divided between Saint-Eustache—Sainte-Thérèse and Terrebonne—Blainville ridings.

Blainville—Deux-Montagnes initially consisted of the cities of Deux-Montagnes and Sainte-Thérèse; the towns of Blainville, Boisbriand, Lorraine, Rosemère, Saint Eustache and Sainte-Marthe-surle-Lac; and the village municipality of Pointe-Calumet and the parish municipality of Saint-Joseph-du-Lac in the county of Deux-Montagnes.

In 1987, it was redefined to consist of the towns of Blainville, Boisbriand, Deux-Montagnes, Lorraine, Rosemère, Saint-Eustache, Sainte-Marthe-sur-le-Lac and Sainte-Thérèse.

This riding has elected the following members of Parliament: