Deux-Montagnes () is a regional county municipality in the Laurentides region of Quebec, Canada. It is located immediately north of Laval on the north shore of the Rivière des Mille-ÃÂles and on the north shore of the Lake of Two Mountains. Its seat and largest city is Saint-Eustache.
The municipality has a land area of 242.88 km<sup>2</sup> and its population was 102,052 residents as of the 2021 Census.
There are 7 subdivisions and one native reserve within the RCM:
Highways and numbered routes that run through the municipality, including external routes that start or finish at the county border:
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