Westmount is an affluent municipality on the Island of Montreal, in southwestern Quebec, Canada. It is an enclave of the city of Montreal, with a population of 19,658 as of the 2021 Canadian census.

The Island of Montreal is a large island in southwestern Quebec, Canada, that is the site of a number of municipalities, including most of the city of Montreal, and is the most populous island in Canada. It is the main island of the Hochelaga Archipelago at the confluence of the Saint Lawrence and Ottawa rivers.