Hello how may I help you? Can you tell me what river flows through Montreal Canada? The river that flows through Montreal is called the St. Lawrence river. Who was that river named after? The river was named after St. Lawrence of Rome. that's amazing. Did the Romans have something to do with Montreal? The Romans influenced the French, who founded the city. That's so cool. Thanks for that info. You're welcome. Anything else you want to know? Nope Have a nice day