| Commsoft Technologies | Quebec |
| CommStream | Manitoba |
| Commtech | Quebec |
| CommTech Services Ltd | Ontario |
| Communauté Agile de Québec | Quebec |
| Communauté d'affaires des sciences de la vie et des technologies de la santé du Québec | |
| Communauté métropolitaine de Montréal | |
| Communautique | Quebec |
| Communi-T | Quebec |
| CommunicAction Hosting | Ontario |
| Communication Duplessis, inc. | Quebec |
| Communication Internet Morin | Quebec |
| Communication Nelson Bibeau | Quebec |
| Communication par l'image | Quebec |
| Communication Research Centre Canada | Ontario |
| Communication Stratford | |
| Communications 2000 | Alberta |
| Communications Cold Lake | |
| Communications Cold Lake, Inc. | Alberta |
| Communications Security Establishment | Ontario |
| Communications Télésignal | Quebec |
| Communicatto, Inc. | Alberta |
| Communicreations | Ontario |
| Communitech | |
| Communitech Corporation | Ontario |
| Community Futures Ontario | Ontario |
| Community Pages | Ontario |
| Community Telecom, Inc. | Ontario |
| Commutron Industries Ltd | Saskatchewan |
| Commvergence | Manitoba |
| Commworx Integrated Solutions Corporation | Alberta |
| ComNet Networks and Security, Inc. | Ontario |
| Comnet Technologies | Quebec |
| Comox Valley Design | British Columbia |
| Compacct Solutions Ltd | British Columbia |
| Compare Cellular | British Columbia |
| CompareMyRates, Inc. | Ontario |
| Compass Creative | Ontario |
| Compass Digital | |
| Compass Media | |
| Compass Renewable Energy Consulting, Inc. | |
| Compatible Computer Services | Nova Scotia |
| Competers, Inc. | Ontario |
| Competitive Edge Information Systems, Inc. | Ontario |
| Compevo Communications | British Columbia |
| Complete Communications, Inc. | Alberta |
| Complete Technologies | Saskatchewan |
| Completely Managed, Inc. | |
| CompleteSystems | Ontario |
| Complys technologies, Inc. | Quebec |