Saint-Laurent is a borough of Montreal, Canada, situated in the northern part of the island. It stands as the largest of Montreal's boroughs by land area, positioned in the north central region. The borough is bordered by Pierrefonds-Roxboro to the west, Ahuntsic-Cartierville to the north and east, and Côte-des-Neiges along with the Town of Mount-Royal to the south. Although it ceased to be an independent city in 2002, it remains a distinct administrative division within the larger metropolitan structure.

The area's history begins in the late 17th century with settlers granted land by Jean Descarie and later the Sulpicians. Saint-Laurent was formally founded as a parish on September 20, 1720, evolving from an agricultural village into a city on February 27, 1893. It maintained its municipal status until merging with Montreal on January 1, 2002, following a failed demerger referendum in 2004 that fell short of the required voting threshold.

The borough features notable neighborhoods such as Bois-Franc, Vieux Saint-Laurent, Norgate, and Saint-Laurent North. Key landmarks include the Bois-de-Liesse Nature Park and the Technoparc Montréal, which serves as Canada's first science park. The area also hosts significant industrial sites, including the grounds of Montréal–Pierre Elliott Trudeau International Airport, where major aviation companies maintain their headquarters.

Cultural life is anchored by educational institutions like Cégep de Saint-Laurent and Vanier College, established in the mid-20th century. The borough offers diverse recreational opportunities through its extensive park system and residential districts developed during post-war booms. Visitors are drawn to its blend of historic village centers and modern suburban developments, reflecting a shift from agriculture to high-tech industries and aviation services.

The population was recorded at 98,828 inhabitants in 2016, with immigrants comprising 54 percent of that total. Saint-Laurent serves as the second-largest employment hub in the metropolitan region after downtown Montreal. Public transport access is provided by the metro network, including stations like Du Collège and Côte-Vertu, alongside light rail expansions planned for 2025, facilitating connectivity across the island.