I know a lot of people will mention some obvious ones, like Mordecai Richler or Gabrielle Roy. Here are a few more contemporary novels worth checking out:
Lullabies for Little Criminals by Heather O'Neill - probably won't give you the nicest view of Montreal, as it's set in the seedy drug scene of the 70s, but it's a pretty good read.
Kathy Reichs' Temperance Brennan series - the original basis for the TV show "Bones", these murder mysteries follow fictional forensic anthropologist Tempe Brennan. They're light, easy reads with an identifiable Montreal backdrop.
Nikolski by Nicolas Dickner - originally published in French but available in English translation, follows the seemingly separate lives of three different characters who eventually end up in Montreal.
I know a lot of people will mention some obvious ones, like Mordecai Richler or Gabrielle Roy. Here are a few more contemporary novels worth checking out: