| Alcmicro | Ontario |
| Alco Prévention Canada | Quebec |
| Alcom Electronic Communications | |
| Alcyone Software | Ontario |
| Aldata Software | Alberta |
| Aldea Solutions, Inc. | Quebec |
| Alding Enterprises | British Columbia |
| Alea Software Ltd | British Columbia |
| Alectro Systems, Inc. | Ontario |
| Aleia Digital | |
| Aleigo | |
| Alengry Concept | Quebec |
| Alentic | |
| Alentus | Alberta |
| Aleop | |
| Aleri, Inc. | |
| Alernativego.net | |
| Alert Labs, Inc. | |
| Alertdriving | |
| Alerte 2000, Inc. | Quebec |
| Alethia Biotherapeutics | |
| Alevia Aero | |
| Alex Mayhew | Ontario |
| Alex Metcalf | British Columbia |
| Alexa Translations | Ontario |
| Alexander College | |
| Alexandre Clément | Quebec |
| AlexBet.com | Ontario |
| Alexi Technologies, Inc. | |
| Alexram Internet Services | Quebec |
| Alexsei | Ontario |
| Alfa Electronique | Quebec |
| AlfaAlfa Software | Ontario |
| Algernon Pharmaceuticals, Inc. | |
| Algo | Quebec |
| Algo Communication Products Ltd | British Columbia |
| Algo SeedLabs | Quebec |
| Algo-Rythm Labs | |
| Algolux | Quebec |
| Algoma Technology Services | Ontario |
| Algoma University | Ontario |
| Algonquin Careers Academy | Ontario |
| Algonquin College | Ontario |
| Algorank | Ontario |
| Algorithme Solutions | |
| Algorithms Graphs and Geometry Lab | |
| Ali Baba Computech | Ontario |
| Alias Apps | |
| Alias Entrepreneur-e | |
| Alias Formation | Quebec |