| Airtechni Inc. | Tout Entreprises et services | airtechni.com |
| Airtek Ltd-Ltée | Abrasives, Tout Entreprises et services | airtekltd.com |
| Airtop-Ventilation | Cleaning Services, Cleaning Service | airtopventilation.ca |
| Airviews | Aerial Photographers | — |
| Airviews - Imageries Aériennes | Aerial Photographers | — |
| Aixa'S Bio Spa | Massage Therapy | — |
| Aja Assurances | Car Insurance | ajaassurances.com |
| Ajr Photobooth | Balloons | facebook.com |
| AKKA Groupe Amérique du Nord | Life Sciences and Health Technologies (LSHT) | akka.eu |
| AKME INC. | Food / Distributors, Food Wholesalers & Suppliers | — |
| Akom Electrique | Electricians | facebook.com |
| Akon's Hitlab | Tout Arts et divertissement | hitlab.com |
| Aktionjob | Tout Entreprises et services | aktionjob.ca |
| Al-Aman | Auto Services | facebook.com |
| Al-Anon Groupes Familiaux | Associations | al-anon-montreal.org |
| Alacoque B & B Revolution | Bed & Breakfasts | bbrevolution.com |
| Alain Acupuncture | Acupuncturists | — |
| Alain Beaupré M.D. | Toutes les Pages perso | mapageweb.umontreal.ca |
| Alain Boudrias Consultant | Architectural Technologists | — |
| Alain Carle | Architectural Technologists | alaincarle.ca |
| Alain Couture | Couture, COUTURE | — |
| Alain Darsigny | Beverage Distributors & Bottlers | — |
| Alain Dauphinais | Beverage Distributors & Bottlers | — |
| Alain Esthétique Auto | Automobiles, car Dealers | — |
| Alain Gravel Peinture Enr | Painters | — |
| Alain Lessard | Business Lawyers | avocatdivorcemontreal.ca |
| Alain Perez Coiffure | Beauty & Fitness, Hairdressers & Beauty Salons | — |
| Alan Fong Coiffure | Beauty & Fitness, Hairdressers & Beauty Salons | — |
| Alan Hui Architects | Architects | — |
| Alarme One Touch Inc | Shopping Mall | facebook.com |
| Alarme Securi-Tek | Car Alarm Systems | — |
| Alb Industires Ltd | Car Repair | — |
| Alba Construction | Home Improvement | — |
| Albatrust - Colocation Data Center | Information Technologies (IT) | albatrust.ca |
| Albert Azoulay Opticien - Maison Mo... | Tout Commerces au détail | albertazoulaymaisonmontures.com |
| Albert Seliger | Business Insurance | standupadvisor.com |
| Albertson Landry | Bailiffs | — |
| Albertson Landry S E N C Huissiers | Bailiffs | — |
| Albina De Leo - Nutrithérapie | Alternative Health | facebook.com |
| Alcan Inc | Aluminum, Aluminum Fabricators | — |
| Alcatel-Lucent Canada | Information Technologies (IT) | alcatel-lucent.com |
| Alchemy 24 | Information Technologies (IT) | alchemy24.com |
| Alchemy 24 Inc | Computer Graphics Design & Animation | alchemy24.com |
| Alchimiste En Herbe | Tout Commerces au détail | alchimiste-en-herbe.com |
| ALCiE Integrated Business Solutions | Tout Informatique et internet | alcie.com |
| Alcoa Canada | Aluminum | alcoa.com |
| Alcoa Canada Cie | Aluminum, Aluminum Fabricators | — |
| Alcoa innovation | Clean Technologies | alcoainnovation.org |
| Alcoholicos Anonimos Oficina Intergrupal Hispanade Montreal | Addiction Treatments & Information | — |
| Alcoholics Anonymous | Associations, Addiction Treatments & Information | aa.org |
