Urban Barn is a Canadian company and some (though I don't think all) of their products are made here. I've had a Canadian made sofa from them for a while now and I love it.
Not exactly what you're looking for, but Palliser Furniture is based in Winnipeg and unfortunately doesn't sell direct online, but their site has a list of retailers in the GTA.
Structube is an independent Canadian family business. Their product is mostly made in China, but you're not going to be able to avoid that. No one but the Mennonites make furniture in Canada. They have a decent selection of office furniture. I have some of their filling cabinets, they're quite nice.
As a side note, almost any furniture that claims to be made in Canada isn't. If you call something a "Product of Canada" that means it's entirely from Canada. But if you say it's "Made in Canada" that just means it's finished here. What companies like the Brick do is essentially bring over an Ikea furniture kit, have a guy assemble it (this process is called "finishing") and now it's "Made in Canada."
Yeah, based out of Montreal (well, Laval if you want to get specific). I've met the owners. Quality varies depending on what you buy, but the price points are generally very reasonable for what you get. The owner describes them as "What you buy when you throw the Ikea stuff away" and I think that gives a pretty good idea of where they sit in terms of quality and price point.
Palliser and EQ3 are made in Canada. If looking for higher end, Bensen is a Canadian company, they used to produce their items in Canada, but has moved production to Italy. At least it’s not US or China. There is also Perez and Speke Klein.