Blainville is an off-island suburb of Montreal, in southwestern Quebec, Canada. It forms part of the Thérèse-De Blainville Regional County Municipality within the Laurentides region of Quebec. Blainville sits at the foot of the Laurentian Mountains. It is located 40 kilometres (25 mi) northwest of downtown Montreal.
Louis de Buade de Frontenac, granted the land, including what is today known as Blainville, to the elite members of society, in order to promote the development of New France. The recipients of the land became lords ("seigneurs"). This act created the Seigneurie des Mille Îles (Lordship of the Thousand Islands), located to the north of the Mille Îles River.
Blainville is named for the third lord of the seigneurie, Jean-Baptiste Céloron de Blainville (1660-1756). On June 14, 1968, the parish of Sainte-Thérèse-de-Blainville was split from the city of Blainville to form its own town.