Delson is an off-island suburb of Montreal, Quebec, Canada. It is situated 8 mi/13 km SSE of Montreal within the regional county municipality of Roussillon in the administrative region of Montérégie. The population as of the Canada 2021 Census was 8,328. On its small territory, Delson is crossed by Route 132 and the Turtle River. 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.