Brewpubs of Plateau Mont-Royal

Dieu du Ciel

(site) 
29 avenue Laurier Ouest
The best beer in Canada, some say. You'll find this brewpub beside a large fire-station when nearing the Mile End neighbourhood from the south. No terrace, but inside you'll find modest establishment that seats over a hundred. Very recently added a large television to the bar, likely after noticing that the bar was deserted during Habs games. At any given moment, they will have 10-20 of their own beers on tap, plus occasionally an "invite" or two. The saison, imperial stout, and IPA's are must-trys if you're a fan of the styles. More experimental beers they've served over the years include a pepper beer and a "umami" beer.

HELM

(site)
273 Bernard Ouest
"HELM" - Houblon, Eau, Levure, et Malte (hops, water, yeast and malt) - focuses more on ambiance than beer, but that's not to say they don't pour a decent pint. This lounge-style brewpub at the far north of Mile End serves a standard array of blanche, blonde, rousse, & noire - all well executed - in addition to offering a few more styles, such as a well-rounded and hoppy American pale ale and some seasonal brews.

Benelux

(site)
245 Sherbrooke Ouest
Named for the tri-nation economic union, one hopes that they draw most heavily from the "Be" portion in the Benelux. And they do. Benelux has 6-10 of their own beers on tap at any given time, sometimes adding a couple invited selections from other small Québec breweries. Having started conservatively in the brewing department, Benelux has amassed a big enough clientèle that it now feels free to branch out into the hoppier territory of double IPA's. Sit at the bar and you might find that your barman also takes part in some of the brewing and is happy to chat about beer. For larger groups, a former bank vault in the bar doubles as a semi-private room that seats about 15.

Le Réservoir 

(site)
9 Duluth Ouest
Just off of rue St-Laurent is le Réservoir, a great local bar with a 2nd floor and patio. They generally have about 8 of their own beers on tap. Their stout is full-bodied and  as are many of the others. Le Réservoir often fills up in the evening and becomes a standing-room-only affair. Food is generally good, but quite pricey. This is a great place to have a decent pint in the central Plateau.

The following two bars are not actually in the Plateau, but in the Quartier Latin. Due to their choice and proximity, they definitely deserve a mention:

Amère à Boire 

(site)
2049 Rue Saint-Denis
This relatively new brewpub has about 10 of their own beers on tap, changing with the seasons. Their imperial stout is delicious, as are some of their wheat beers.

Le Saint-Bock

(site)
1749 Rue Saint-Denis
The St-Bock does quite a few of their own beers, but also offers many hard-to-find Québecois beers on tap. Their menu boasts over 100 bottles of domestic and imported beer, but their prices justify sticking with the bière en fût.

Alternatively, on a warm and sunny day, you can always stop off at Le Paradis de la Bière (a.k.a. Chez Rahman), the best beer Dépanneur in Montréal with over 300 beers in stock, at 151 Laurier Ouest and then head to the park!