The Main, Historic district along Saint Laurent Boulevard in Montreal, Canada.

The Main is the stretch of Boulevard Saint-Laurent running north from Old Montreal through Ville-Marie, Le Plateau-Mont-Royal and Rosemont–La Petite-Patrie. Its rows of three- and four-storey greystone and brick buildings mix ground-floor shops with flats above, and exterior staircases climb the facades. It was designated a national historic site of Canada.

The street follows an old north-south route that linked the St. Lawrence River to the foot of Mount Royal. In the 19th century it carried goods and people between the harbour and the growing city, and by the early 20th century it had become the main artery of immigrant Montreal, with communities from Ireland, Scotland, Italy, Portugal, Greece, the Jewish diaspora and China settling along it. It was designated a national historic site of Canada in 1996.

The street has long served as a social gathering place where different communities maintain their identity through small shops, restaurants, and street life. These neighborhoods shape the character of the boulevard today through their distinct languages, aromas, and traditions.

The Main runs along Boulevard Saint-Laurent, and its length is served by metro stations including Saint-Laurent, Sherbrooke and Mont-Royal on the orange line. The street crosses several boroughs, so walking a section at a time keeps orientation easy; sidewalks are the main way to follow it.

The architecture displays grey Montreal stone and brick walls that bear witness to the site's industrial past. These facades tell through their structure and wear the story of many people who lived and worked here.