Beaconsfield is a suburb on the Island of Montreal, Quebec, Canada, part of the Greater Montreal region locally referred to as the West Island. It is a prestigious residential community located on the north shore of Lac Saint-Louis, bordered on the west by Baie-D'Urfé, north by Kirkland and east by Pointe-Claire.

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.