Deux-Montagnes (French pronunciation: [dø mɔ̃taɲ]) is a regional county municipality in the Laurentides region of Quebec, Canada.

Its seat and largest city is Saint-Eustache.

The municipality has a land area of 242.88 km2 and its population was 102,052 residents as of the 2021 Census.

[3] There are 7 subdivisions and one native reserve within the RCM:[2]

Highways and numbered routes that run through the municipality, including external routes that start or finish at the county border:[9]