| AGRICULTURE PECHERIS ET ALIMENTATION | Blue Pages | — |
| Agripak | Cloth Bags | — |
| AGROCAN INC. | Food / Distributors, Food Wholesalers & Suppliers | agrocanfoods.com |
| Agroplus | Chemicals | — |
| Agropur Coopérative | Agri-food | agropur.com |
| Agtronic Motorsport | Collectibles | tomsnow.ca |
| AGUA Nettoyage Haute Pression | Cleaning Services, Cleaning Service | aguanettoyage.com |
| Ahearn & Soper Inc. | Tout Entreprises et services | ahearn.com |
| AHEPA CG7 MONTREAL | Blue Pages | — |
| AHEPA – DAUGHTERS OF PENELOPE MONTREAL | Blue Pages | — |
| AHEPA – MAIDS OF ATHENA MONTREAL | Blue Pages | — |
| AHEPA – SONS OF PERICLES MONTREAL | Blue Pages | — |
| Ahidjo Design | Advertising Agencies | — |
| Ahuntsic Auto Centre Inc | Car Repair | facebook.com |
| Ahuntsic Cartierville Culture Sports Récreation Libraries Ahuntsic | Not Profit, library | facebook.com |
| Ai Dumpling Restaurant | Chinese Food Restaurants | facebook.com |
| Ai Nakamura | ai | — |
| Aide Inc | Care Homes | aideplusanjou.ca |
| Aide à Domicile O | Care Homes | — |
| Aids Intervention Centre Clsc | Addiction Treatments & Information | — |
| AIESEC International | International Organizations | aiesec.org |
| AiFred | Information Technologies (IT) | aifredhealth.com |
| Aikido Montreal | Tout Enseignement et savoir | aikidomontreal.ca |
| Aing Ky Lim | ky | — |
| Ainsworth Montreal (Simpkin elect..mec) | Electricians | ainsworth.com |
| Air Bermuda Inc | Aircraft & Private Jet Charter | airbermuda.ca |
| Air Bourotte Ventilation | HVAC | facebook.com |
| Air Canada Cargo | Airlines | — |
| Air Canada Reservations | Airlines | aircanada.com |
| AIR Electrique | Electricians | — |
| Air Fusion | Air Conditioning Contractors | airfusion.biz |
| AIR IMEX Ltée | Aerial Photographers | airimex.ca |
| Air Inuit | Airlines | — |
| Air Inuit | Airlines | airinuit.com |
| Air Inuit Administration | Aircraft & Private Jet Charter | airinuit.com |
| Air Inuit Ltd | Aircraft & Private Jet Charter, Airlines | — |
| Air Inuit Nolisement | Aircraft & Private Jet Charter | — |
| Air Max Climatisation | Air Conditioning Contractors | air-max.ca |
| Air Métropolitain 2000 | Air Conditioning Repair & Cleaning | — |
| AIR RESEARCH TECHNOLOGY INC. | Aerospace | wingxstol.com |
| Air solution confort | Air Conditioning Contractors | — |
| Air Ticket Market | Airline Ticket Agencies | — |
| Air Transat | Airlines | — |
| AIR ÉNERGIE TCI INC | Life Sciences and Health Technologies (LSHT) | tcir.net |
| Airbnb | Information Technologies (IT) | airbnb.ca |
| Airbridge International Inc | Airlines | airbridge.ca |
| aire commune | Tout Bars et restaurants, Tout Entreprises et services, Tout Tourisme et hôtels | airecommune.com |
| Airline Revenue Management Training Group | Airlines | — |
| Airmax Environnement | Analytical & Testing Laboratories | airmax-environnement.com |
| Airpure Shop | Air Conditioning Contractors | — |
