- Athabasca River
- Athabasca University
- Atheism and Agnosticism
- Athol Murray College of Notre Dame
- Atikamekw
- Atikokan
- Atlantic Campaign of the War of 1812
- Atlantic Canadian Composers' Association/Association des Compositeurs Canadiens de l'Atlantique
- Atlantic City
- Atlantic Provinces
- Atlantic Salmon
- Atlantic Symphony Orchestra/Orchestre symphonique de l'Atlantique
- Atlantic Theatre Festival
- Atlin
- Atlin Lake
- Atom Egoyan
- Atom Egoyan (Profile)
- Atom Egoyan (Profile)
- Atomic Energy Control Board
- Atomic Energy of Canada Ltd
