- Associated Board of the Royal Schools of Music
- Associated Manitoba Arts Festivals, Inc
- Association canadienne-française pour l'avancement des sciences (Acfas)
- Association chorale Brassard
- Association chorale Saint-Louis-de-France
- Association de musique actuelle de Québec
- Association des chanteurs de Montréal
- Association des Frères-Chasseurs
- Association for Canadian Studies (ACS)
- Association of Canadian Choral Communities
- Association of Canadian Orchestras/Association des orchestres canadiens
- Association of Canadian Women Composers/Association des femmes compositeurs canadiennes
- Association of Canadian Women Composers/L'Association des femmes compositeurs canadiennes
- Association of Universities and Colleges of Canada
- Associations
- Aster
- Asthma
- Astral Media
- Astrid Dora Janson
- Astronomy
