| Articles Promotionnels CPG Inc | Calendars | articlespromocpg.com |
| Articule | Tout Commerces au détail | articule.org |
| Articule Incorpore | Art Galleries, Dealers & Consultants | articule.org |
| Artifact5 | Information Technologies (IT) | artifact5.com |
| Artifex Animation Studios | Information Technologies (IT) | aastudios.ca |
| Artis Paysage | Landscaping | — |
| Artisan | Landscaping | — |
| Artisan de l'Acier | Arts & Crafts Stores | — |
| Artisan Enterprises | Arts & Crafts Stores | — |
| Artisan Robert Paré | Painters | — |
| Artissimo Prints Inc | Art Galleries, Dealers & Consultants | — |
| Artist Loft Vieux Montreal A Vendre For Sale | Artists | — |
| Artiste Peintre Robert Johnson | Painters | artistepeintrerobertjohnson.com |
| Artistespace | Auditoriums & Halls | facebook.com |
| Artistic Agitators | Audiovisual Production Services | facebook.com |
| Artistic Balloon Decorations Balonik | Balloons | balonik.com |
| Artlogic | Advertising Agencies | artlogic.ca |
| Artmetco Inc. | Tout Entreprises et services | artmetco.com |
| ArtMotive Garage | Auto Body Shop | artmotivegarage.squarespace.com |
| Artnatu | Arts & Crafts Markets | — |
| Artothèque De Montréal | Not Profit, Tout Arts et divertissement, library | artotheque.ca |
| Arts & Lettres Produits | Art Materials & Supplies | coopstlaurent.com |
| Arts & Opinion | Tout Médias montréalais | artsandopinion.com |
| Arts Corps | Fitness Gyms | artscorps.ca |
| Arts et Antiquités Méduse Galerie | Art Galleries, Dealers & Consultants | — |
| Arts M C | Arts & Crafts Stores | — |
| Arts Undergraduate Society Of McGill University | Art Schools | — |
| ArtToCanvas/ArtToGroup | Art Galleries, Dealers & Consultants | arttocanvas.com |
| Artur | Art Galleries, Dealers & Consultants | — |
| Arturo Dilonardo et Fils | Landscaping | facebook.com |
| Arturos Cleaning/Limpiesa | Cleaning Services, Cleaning Service | — |
| Aréna Ahuntsic | Arenas, Stadiums & Athletic Fields | facebook.com |
| Aréna Camillien-Houde | Arenas, Stadiums & Athletic Fields | facebook.com |
| Aréna Maurice-Richard | Arenas, Stadiums & Athletic Fields | ville.montreal.qc.ca |
| Aréna Mont-Royal | Arenas, Stadiums & Athletic Fields | facebook.com |
| As du Lavage à Pression | Building Exterior Cleaning | asdulavageapression.com |
| As du rangement | Home Improvement | — |
| As Marleau | as | — |
| ASA Cleaning Service | Cleaning Services, Cleaning Service | — |
| ASC Nova | Circular & Sample Distribution | — |
| Ascenseurs Savaria Concord Inc. | Life Sciences and Health Technologies (LSHT) | savaria.com |
| Ascension Lutheran Church | Tout Communautés et société | ascensionlutheran.ca |
| ASentretien | Cleaning Services, Cleaning Service | — |
| ASEQ Alliance Pour La Santé Étudiante Au Québec | Health Services | aseq.com |
| ASG Canada | Information Technologies (IT) | asg.com |
| ASG Électrique Inc | Electricians | asgelectrique.com |
| Ash Gallery | Art Galleries, Dealers & Consultants | facebook.com |
| Ashley Entrepôt De Rallonge | Beauty & Fitness, Hairdressers & Beauty Salons | — |
| ASI Computer Technologies (Canada) Corp | Information Technologies (IT) | asipartner.com |
| Asi Corporation | Computer Manufacturers & Wholesalers | asipartner.com |
