LaSalle is the most southerly borough (arrondissement) of the city of Montreal, Quebec, Canada. It is located in the south-west portion of the Island of Montreal, along the Saint Lawrence River. Prior to 2002, it was a separate municipality that had been incorporated in 1912.

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.