| Aramark Canada Ltée | Lasalle | Coffee Machines & Roasting Equipment |
| Arbrobec Parts Canada Ltd. | Mirabel | Tout Entreprises et services |
| ARCHANGELS Greek Orthodox Comm. | Montréal | Blue Pages |
| Archimed Studio | Laval | Computer Graphics Design & Animation |
| ARCHIVES IRON MOUNTAIN | Lachine | Information Technologies (IT) |
| Arctic Traveler Canada Ltd | Montréal | Garage Auto |
| Arena Pizzeria | Lachine | Pizza & Pizzerias |
| Arena Tasty Pizzeria Lachine Restaurant | Lachine | Pizza & Pizzerias |
| Arianne Relocation Canada | Ville-Émard Et Côte-Saint-Paul | Tout Entreprises et services |
| Arlee Canada Inc | Montréal | Bedding & Linens |
Publicité (Desktop) Publicité (Mobile) |
| Armando Marquez | Montréal | Computer Graphics Design & Animation |
| Arneg Canada Inc. | Lacolle | Tout Commerces au détail |
| Arrondissement de Lachine | Montréal | Tout Informations générales |
| Arrondissement de Lachine | Lachine | Not Profit, library |
| Arrow Électronique Canada | Baie-D'urfé | Information Technologies (IT) |
| Arslan Automotive Canada Ltée | Pointe-Claire | Tout Commerces au détail |
| Art Forge | Lachine | Art Foundries |
| Artech Camps Canada | Montréal | Camps |
| Artelys Canada | Montréal | Information Technologies (IT) |
| Artemano Canada | Laval | Furniture Stores |
Publicité (Desktop) Publicité (Mobile) |
| Artemano Canada | Laval | Furniture Stores |
| Artisans Canada | Québec | Tout Commerces au détail |
| ASCO Valve Canada | Dorval | Tout Entreprises et services |
| ASG Canada | Montréal | Information Technologies (IT) |
| Ashley's Little Gift Shop | Lachine | Candles |
| ASI Computer Technologies (Canada) Corp | Montréal | Information Technologies (IT) |
| Asi Corporation | Montréal | Computer Manufacturers & Wholesalers |
| Asplundh Canada | Terrebonne | Life Sciences and Health Technologies (LSHT) |
| Assima Canada / Wizart Canada | Montréal | Information Technologies (IT) |
| Assistance Ménage | Ste-Rose | Tout Entreprises et services |
Publicité (Desktop) Publicité (Mobile) |
| Association des scouts du Canada | Villeray | Tout Arts et divertissement, Tout Communautés et société |
| Association des Techniciens en Sant... | Lachine | Tout Entreprises et services |
| Association Sociale Inca Canada | Montréal | Associations |
| Assurance123.ca | Lachine | Tout Entreprises et services |
| ASSYSTEM PRODUCT ENGINEERING CANADA | Montréal | Aerospace |
| AstraZeneca Canada | Longueuil | Life Sciences and Health Technologies (LSHT) |
| Astucemédia Inc | Montréal | Computer Graphics Design & Animation |
| Asus | Montréal | Computer & Technology Assistance Programs |
| AT&T Canada | Centre-Ville | Tout Entreprises et services |
| ATD DESIGN SERVICES (4071468 CANADA INC.) | Sainte-Geneviève | Aerospace |
Publicité (Desktop) Publicité (Mobile) |
| Atek Canada | Montréal | Tout Informatique et internet |
| Atelier De Daria Centro Canada | Montréal | Furniture Stores |
| Atelier Du Presse-Citron | Montréal | Computer Graphics Design & Animation |
| ATEM Canada Inc | Montréal | Information Technologies (IT) |
| AtGen Canada | Laval | Life Sciences and Health Technologies (LSHT) |
| Atlas Copco Compressors Canada | Dollard Des Ormeaux | Life Sciences and Health Technologies (LSHT), Compressors |
| Atomique Multiplicité | Saint-Jérôme | Computer Repair & Cleaning |
| Atwater Library and Computer Centre | Centre-Ville | Tout Enseignement et savoir, Tout Informatique et internet |
| AugureNet | Montréal | Computer Networking |
| Aust & Hachmann (Canada) Ltd | Pointe-Claire | Agri-food |
