Lachute is a town in southwest Quebec, Canada, 82.2 km northwest of Montreal, on the Rivière du Nord, a tributary of the Ottawa River, and west of the Mirabel International Airport. It is located on Autoroute 50, at the junctions of Quebec Provincial Highways Route 148, Route 158, and Secondary Highways 327 and 329. Lachute is the seat of Argenteuil Regional County Municipality. It also has a local airport: Lachute Airport.