Delson is an off-island suburb (South shore) of Montreal, Quebec, Canada.

On its small territory, Delson is crossed by Route 132 and the Turtle River (Rivière de la Tortue).

The city owns a portion of the Champlain industrial park as well as the Delson commuter train station with service to and from Montreal on the AMT's Candiac Line.

The Canadian Railway Museum (Exporail) occupies a large tract between Delson and Saint-Constant.

Delson was founded in 1918 as a village municipality before obtaining its status of a city 21 February 1957.