| Aeromontreal International | |
| Aeronav, Inc. | Quebec |
| Aeroneuf Instruments Ltd | |
| Aeronovo | |
| Aéroport AI | |
| Aéroport de Sherbrooke | Quebec |
| Aéroports de Montréal | |
| AeroQube | |
| Aerosoft Systems, Inc. | Ontario |
| Aerospace Industries Association of Canada | |
| Aerospace Manufacturing and MRO Conference | |
| Aerosphere | |
| Aerosystems International, Inc. | Quebec |
| Aerotec Engines Ltd | |
| Aesonlabs Data Recovery Systems | |
| Aethon Design & Development | Quebec |
| Aetonix Systems | |
| Affective Design, Inc. | Alberta |
| Affine Communications | British Columbia |
| Affinio, Inc. | Nova Scotia |
| Affinity Biologicals, Inc. | Ontario |
| Affinity Bridge | British Columbia |
| AffinityImmuno, Inc. | Prince Edward Island |
| Affinor Growers, Inc. | |
| Affluences.ca | Quebec |
| Affordable Computer Tech | British Columbia |
| Affordable Web Design | British Columbia |
| Affordable Web Design Ltd | |
| Affordance Studio | Quebec |
| AffordHost | Ontario |
| AFG Consultants, Inc. | Quebec |
| AFI | Quebec |
| AfinityClick, Inc. | Ontario |
| Afreet Software, Inc. | Ontario |
| AFSHAHIN Corporation | |
| AfterSell | |
| Afuken | Quebec |
| AFX Medical | Quebec |
| AG-Bio Centre | Quebec |
| Ag-Nav, Inc. | Ontario |
| AGADA Biosciences, Inc. | Nova Scotia |
| AGAMA | |
| AGE-WELL | |
| Ageil Animal, Inc. | Alberta |
| Ageis Technologies | Ontario |
| Agence Bix | Quebec |
| Agence Boréale | |
| Agence BSB | |
| Agence Casa Média, Inc. | |
| Agence Code | Quebec |