| Content Turbine | Ontario |
| Contenta Web Services | Ontario |
| ContentLab | Ontario |
| Context Creative | Ontario |
| Context Discovery, Inc. | Ontario |
| Contextere | |
| ContextMagic.com | British Columbia |
| Conti | British Columbia |
| Contigo | British Columbia |
| Continental Automated Buildings Association | Ontario |
| ContinuIT Corporation | Ontario |
| Continuum Communication | Quebec |
| Continuum Digital | Ontario |
| Continuum Software Solutions | Ontario |
| Contra-Tek | Ontario |
| Contract CADD group | British Columbia |
| Contract Pharmaceuticals Ltd | |
| Contractor Compliance, Inc. | |
| ContractorWebsites.ca | |
| Contractually | British Columbia |
| Contractuelle communicateurs-conseils | Quebec |
| Contrast Checker | Ontario |
| Contraste Canada Conseillers en informatique, Inc. | Quebec |
| Control Alt Delete Managed IT Services | British Columbia |
| Control System Innovators Corporation | Ontario |
| Control Systems Unlimited | Ontario |
| Contrôle PC, Inc. | Quebec |
| Contrôle SCI | Quebec |
| ControlEng corporation | Ontario |
| Contrôles Carostan | Quebec |
| ContrôleTech | |
| Contxtful | |
| Conundrum Capital Corporation | Ontario |
| Convatec, Inc. | |
| Converge Technology Solutions Corporation | Quebec |
| Converge-net | Quebec |
| Converge-Net, Inc. | Quebec |
| Convergence Blended Finance | |
| Convergence Concepts, Inc. | |
| Convergence Instruments | Quebec |
| Convergence Networks | Ontario |
| Convergence.Tech | |
| Convergent Manufacturing Technologies, Inc. | British Columbia |
| Convergine | |
| Convergint | |
| Conversion Digital | |
| Convex Logic | Ontario |
| Convex Studio Ltd | Ontario |
| Convictional | |
| Conxcom, Inc. | Ontario |