Not to be that guy (okay ... on second thought I am going to be that guy), the commemoration of Elizabeth II's official birthday in Canada coincides with Victoria Day, but Victoria Day itself does not mark Elizabeth II's official birthday (although it marks Victoria's birthday). Elizabeth II's official birthday and Victoria Day are simultaneous, but separate, events. In Ontario, Victoria Day is the holiday, not Elizabeth II's official birthday (although the latter happens to land on a holiday).
ETA: According to Wikipedia, New Brunswick and Nunavut have a holiday for Elizabeth II's official birthday, not Victoria Day, albeit on the same day as much of the rest of country celebrates Victoria Day as a holiday.