| ACAMP | |
| Acanac | Quebec |
| Acappella Information Systems | Ontario |
| Acart Communications | Ontario |
| Acbis | Quebec |
| Accedian Networks, Inc. | Quebec |
| Accelerate Financial Technologies, Inc. | Alberta |
| Accelerate Fund | Alberta |
| Accelerate Her Future | |
| Accelerate Okanagan | British Columbia |
| AccelerateAB | Alberta |
| Accelerated Systems, Inc. | |
| Accélérateur Banque Nationale - HEC Montréal | |
| Accelerator Centre | Ontario |
| Accelia Capital | |
| Accell Télésystèmes | Quebec |
| Accelware Ltd | Alberta |
| ACCEO Solutions, Inc. | |
| ACCEO Transport | |
| AcceptLocal Online Ltd | |
| Accès Communications | Quebec |
| Acces Électronique | Quebec |
| Accesoware | Ontario |
| Access 2 Networks, Inc. | Ontario |
| Access Communications Co-operative Ltd | Saskatchewan |
| Access Computer Rentals | British Columbia |
| ACCESS Corporate Technologies | Ontario |
| Access Credit Union | |
| Access Technologies, Inc. | Ontario |
| Access WHOIS | British Columbia |
| AccessAnywhere Systems | Ontario |
| ACCI | Quebec |
| Acciss.net | British Columbia |
| Accord Consulting | Ontario |
| Accountable IT Solutions | Ontario |
| Accountek Solutions | Ontario |
| Accra Solutions, Inc. | New Brunswick |
| Accrete Web Solutions | British Columbia |
| Accsoft | Ontario |
| AccSys Solutions, Inc. | British Columbia |
| Accu-Automation Corporation | Ontario |
| Accu-Staff Resource Systems Enterprises Ltd | Ontario |
| Acculogic Technologies, Inc. | British Columbia |
| Accumulated Ocean Energy, Inc. | British Columbia |
| Accurate Business Machines, Inc. | Ontario |
| Accurate Data Recovery | Ontario |
| Accurate Design & Communication, Inc. | Ontario |
| Accurate Technologies Ltd | Ontario |
| Accure Technologies | |
| Accutel | |