The Lachine Canal is a canal passing through the southwestern part of the Island of Montreal, Quebec, Canada, running 14.5 kilometres from the Old Port of Montreal to Lake Saint-Louis, through the boroughs of Lachine, Lasalle and Sud-Ouest. Before the canal construction there was a lake, "Lac St Pierre". The lake and its rivers can be seen on the maps of Montreal of the years 1700, 1744 and on the map titled "The isles of Montreal. As they have been surveyed by the french engineers" (1761).
The canal gets its name from the French word for China (La Chine). The European explorers sought to find a route from New France to the Western Sea, and from there to China and hence auspiciously the region where the canal was built was named Lachine. Currently, the canal, due to the continuous disposal of industrial waste, has the prevalence of harmful substances, although the water quality is said to be good.