I should also mention some particularly famous Canadian films which are not on my list. Some are films I either didn't see or saw too long ago to remember well; others are films I personally didn't like enough to recommend.
Goin' Down the Road (Donald Shebib, 1970); The Apprenticeship of Duddy Kravitz (Ted Kotcheff, 1974);
Le déclin de l'empire américain (Denys Arcand, 1986); Jésus de Montréal (Denys Arcand, 1989);
Crash (David Cronenberg, 1996); Les invasions barbares (Denys Arcand, 2003); Bon cop, bad cop (Erik Canuel, 2006);
Passchendaele (Paul Gross, 2008); Barney's Version (Richard J. Lewis, 2010); Incendies (Denis Villeneuve, 2010).