Rivière-des-Mille-Îles (formerly known as Saint-Eustache—Sainte-Thérèse) is a federal electoral district in Quebec, Canada, that has been represented in the House of Commons of Canada since 1997.

This riding is located in the northern suburbs of Montreal, on the north shore of the Rivière des Mille-Îles. Since 2003, it has consisted of the cities of Deux-Montagnes, Saint-Eustache and Sainte-Marthe-sur-le-Lac in the Regional County Municipality of Deux-Montagnes; and the City of Boisbriand in the Regional County Municipality of Thérèse-De Blainville.

The neighbouring ridings are Argenteuil—Papineau—Mirabel, Marc-Aurèle-Fortin, Laval, Laval—Les Îles, and Pierrefonds—Dollard.

Ethnic groups: 94.0% White, 1.4% Black, 1.1% Southeast Asian
Languages: 85.5% French, 8.2% English, 1.8% Yiddish
Religions: 83.7% Christian (78.4% Catholic, 5.3% Other), 3.1% Jewish, 1.1% Muslim, 12.2% No religion
Median income (2010): $31,752
Average income (2010): $39,705

It was created in 1996 as "Saint-Eustache—Sainte-Thérèse" riding from parts of Blainville—Deux-Montagnes riding.

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