| Aura Social | Quebec |
| Auracom | Ontario |
| Aurea | |
| Aurel Systems, Inc. | British Columbia |
| Aurelis | |
| Aurora NanoDevices, Inc. | |
| Aurora Scientific, Inc. | |
| Aurora Spine, Inc. | |
| Aurora Technologies | |
| Auscanonline | British Columbia |
| Auspice Capital Advisors | |
| Austco Marketing & Service (Canada) Ltd | Ontario |
| Austech Development, Inc. | Ontario |
| Austin Graphics | Ontario |
| Austin Security | |
| Authen-TIC | Quebec |
| Authentic Agency | Quebec |
| Authentic Web | Ontario |
| Authenticiti | Ontario |
| Authornate | |
| Auto-Star Compusystems, Inc. | Alberta |
| Autocorp.ai, Inc. | |
| Autodesk Canada Co. | Ontario |
| Autoflexilog, Inc. | Quebec |
| Autohost | |
| AutoLeap, Inc. | |
| Autom8Growth | |
| Automated Power Solutions. | British Columbia |
| Automated Systems Research | British Columbia |
| Automatex, Inc. | Quebec |
| Automation Associates, Inc. | Ontario |
| Automation D'Amours | Quebec |
| Automation DCO, Inc. | Quebec |
| Automation Engineering Associates Ltd | Ontario |
| Automation Larouche, Inc. | Quebec |
| Automation One Business Systems, Inc. | British Columbia |
| Automato Solutions | |
| Automotive Data Solutions | |
| Autonomous | |
| AutoOptimize | |
| Autoroute.net, Inc. | Quebec |
| AutoServe1 | Ontario |
| Autoship | British Columbia |
| Autostart | Quebec |
| Autotec Technologies | Quebec |
| Autumnfire Internet Solutions, Inc. | Ontario |
| Auvenir | |
| Auventa | |
| Auvik Networks, Inc. | Ontario |
| Auxano Global Services | |