The Montreal Metro is a rubber-tired metro system, and the main form of public transportation underground in the city of Montreal, Quebec, Canada.

The Metro, operated by the Societe de transport de Montreal (STM), was inaugurated on October 14, 1966, during the tenure of Mayor Jean Drapeau. Originally consisting of 26 stations on three separate lines, the Metro now incorporates 68 stations on four lines measuring 65.33 km (40.59 mi) in length, serving the north, east, and centre of the Island of Montreal with connections to Longueuil, via the Yellow Line, and Laval, via the Orange line. The metro system is currently Canada's second longest and second in total annual passenger usage, serving 289.1 million riders a year (transfers not included); according to the STM website, the metro system has transported over 6 billion passengers as of 2006, roughly equivalent to the world's population. The Montreal Metro was inspired by the Paris Metro and in turn is also the inspiration for the Lyon Metro, constructed a few years later, which shares the same rubber-wheel car design and Montreal Metro station architecture.