Charron Island (French: Île Charron) is an island in the Saint Lawrence River, the westernmost of the Îles de Boucherville archipelago, near Îles-de-Boucherville National Park to the northeast of Montreal. It is part of the city of Longueuil, and is connected to the mainland and the Island of Montreal by the Louis-Hippolyte Lafontaine Bridge–Tunnel which carries Quebec Autoroute 25 and the Trans-Canada Highway.