Downtown and Quartier Latin:
La Pâtisserie Belge, 3485, av. du Parc (not far from the McCord Museum).
La Brioche Lyonnaise at 1593, rue St-Denis (Berri metro).
The east exit of the Sherbrooke metro* station has a pastry paradise whose name I forget.
Sometimes true wonders abound in mundane locations.
*Metro is Montrealais for subway or tube
or underground or U-bahn or whatever you choose to call that mode of locomotion.
The commas after the address numbers are French typography (thats Freedom typography for you Dubya fans.)
Boulangerie Première Moisson chain has two locations downtown:
1490, Sherbrooke Ouest (near the Montreal Museum of Fine Arts);
895, rue de la Gauchetière Ouest (the train station).
West of downtown:
La Pâtisserie de Gascogne, 4825, Sherbrooke Ouest in Westmount.
La Pâtisserie de Nancy, at 5655, av. Monkland, several blocks west of the Decarie expressway.
Au Duc de Lorraine on Cote-des-Neiges just south of Reine-Marie.
North of downtown:
La Pâtisserie Bruxelloise, 860, av. du Mont-Royal Est.
La Pâtisserie Belge, 1075, rue Laurier Ouest.
La Pâtisserie de Gascogne, 237, rue Laurier Ouest.
Le Paltoquet, 1464, rue Van Horne, Outremont.
Bon appétit!