| Compagnie Gillette Canada | Pointe-Claire | Tout Entreprises et services |
| Compagnie Martin Brower du Canada | Baie-D'urfé | Agri-food |
| Compagnie Sealed Air Canada | Montréal | Life Sciences and Health Technologies (LSHT) |
| Compagnie Technologies Unity Canada | Montréal | Information Technologies (IT) |
| Compass Group Canada (Beaver) Ltd | Greenfield Park | Commercial Kitchen Equipment |
| Compass Minerals Canada Corp | Repentigny | Agri-food |
| Compucom Canada Co | Montréal | Actuary Consulting & Services |
| Compumatik | Montréal | Computer Repair & Cleaning |
| Computer sciences corporation | Montréal | Information Technologies (IT) |
| Computershare Trust Company of Canada | Montréal | Information Technologies (IT) |
Publicité (Desktop) Publicité (Mobile) |
| Compuware Corporation of Canada | Montréal | Information Technologies (IT) |
| Con X Équipement Canada Inc. | Montréal | Tout Entreprises et services |
| ConAgra Foods Canada Inc. | Boisbriand | Tout Entreprises et services |
| Conception Tekni-B | Brossard | Computer & Technology Assistance Programs |
| Concours du Québec | Unknown | Tout Commerces au détail |
| Connect Canada Inc | Montréal | Audiologists |
| Connect&Go | Outremont | Computer Networking |
| Connecteurs Électriques Weco Inc | Kirkland | Information Technologies (IT) |
| Conseil des Palettes du Canada | Laval | Shopping Mall |
| Conseil national de recherches Canada (CNRC) | Boucherville | Clean Technologies |
Publicité (Desktop) Publicité (Mobile) |
| Conservation de la nature Canada (C... | Quartier Latin Et Centre-Sud | Tout Communautés et société |
| Consortium Mr Canada Inc | Mirabel | Building Contractors |
| Construction Kumar - 9215646 Canada Inc | Montréal | Flooring |
| Consulmac | Toronto | Computer Repair & Cleaning |
| Contraste Canada | Boucherville | Tout Informatique et internet |
| Contrôles Rotork (Canada) | Montréal | Life Sciences and Health Technologies (LSHT) |
| Cooper Rentals Canada Inc | Brossard | Compressors |
| Copiscope | Longueuil | Computer Accessories & Supplies |
| Corporation Caterpillar du Canada | Laval | Information Technologies (IT) |
| Corporation Efundraising.com Inc | Montréal | Information Technologies (IT) |
Publicité (Desktop) Publicité (Mobile) |
| Corporation Services Moneris | Montréal | Information Technologies (IT) |
| CORPORATION SERVICES MONERIS (CSM) | Montréal | Information Technologies (IT) |
| Corporation Stellar Canada Inc | Montréal | Call Centres |
| Corporation STERIS Canada | Montréal | Life Sciences and Health Technologies (LSHT) |
| Corporation Vocalcom Canada Inc | Montréal | Information Technologies (IT) |
| CORPORATION WORLDPAY CANADA | Montréal | Information Technologies (IT) |
| Correctional Service of Canada | Montréal | Not Profit, library |
| Corrpro Canada Inc. | Dorval | Tout Entreprises et services |
| corstem | Montréal | Information Technologies (IT) |
| Coty Canada | Dorval | Life Sciences and Health Technologies (LSHT) |
Publicité (Desktop) Publicité (Mobile) |
| Coty Canada Inc. | Dorval | Tout Commerces au détail |
| Couture Andre | Montréal | Couture, COUTURE |
| Couture Francois | La Prairie | Couture, COUTURE |
| Couture Gracienne Boulet | Brossard | Couture, COUTURE |
| Couture Murena Aubut | Longueuil | Couture, COUTURE |
| Couture Suzanne | Longueuil | Couture, COUTURE |
| Coveo | Montréal | Information Technologies (IT) |
| Covidien Canada | Pointe-Claire | Life Sciences and Health Technologies (LSHT) |
| CPA Canada | Centre-Ville | Tout Entreprises et services |
| CRAWFORD & COMPAGNIE CANADA INC | Montréal | Life Sciences and Health Technologies (LSHT) |
