| Ciné Monde Canada | Montréal | Camera & Photo Equipment Stores |
| Cisco Systems Canada | Montréal | Information Technologies (IT) |
| CITIZENSHIP AND IMMIGRATION CANADA | Montréal | Blue Pages |
| CITP Database Services | Montréal | Computer Data Processing |
| CJNT TV Cable 14, J. Kokkonas | Montréal | Blue Pages |
| CKDG | Montréal | Blue Pages |
| Claret Canada Inc | Richelieu | Tout Entreprises et services |
| Clariant Canada Inc | Montréal | Colours & Pigments |
| Clariant Canada Inc Masterbatches Division | Lachine | Agricultural Chemicals |
| Clarins Canada Inc | Laval | Life Sciences and Health Technologies (LSHT) |
Publicité (Desktop) Publicité (Mobile) |
| Clarins Canada Inc. | Chomedey | Tout Commerces au détail |
| Claude Couture | Saint-Hubert | Couture, COUTURE |
| Claude Couture | Saint-Hubert | Couture, COUTURE |
| Claudette Couture | Montréal | Couture, COUTURE |
| Claudette Couture | Montréal | Couture, COUTURE |
| Claudette Couture | Saint-Mathias-Sur-Richelieu | Couture, COUTURE |
| Clever Plays | Montréal | Information Technologies (IT) |
| CLG Computer Consultants Inc. | Saint-Henri | Tout Entreprises et services |
| Clicpomme | Montréal | Tout Informatique et internet, Computer Consultants |
| Climatair Canada | Montréal | Appliance Repair & Service |
Publicité (Desktop) Publicité (Mobile) |
| Climatiseur Zoom Air 9428119 Canada Inc | Montréal | Air Conditioning Contractors |
| CliqueIA Tech INC | Montréal | Computer Consultants |
| Clorox Company of Canada Ltd. | Pointe-Claire | Tout Entreprises et services |
| Cloudops | Montréal | Tout Informatique et internet, Computer Consultants |
| CloudOps | Montréal | Computer Consultants |
| CloudOps | Montréal | Computer Repair & Cleaning |
| Club Alpin du Canada, Section Montr... | Western Quebec | Tout Arts et divertissement |
| Club PVRH Centre d'Assistance Resso... | Brossard | Tout Entreprises et services |
| Clé en main Informatique | Montréal | Computer Networking |
| Cmyktoner | Côte Saint-Luc | Computer Networking |
Publicité (Desktop) Publicité (Mobile) |
| Cna | Montréal | Computer Consultants |
| Co-operators Compagnie d'Assurance | Montréal | Information Technologies (IT) |
| Cocoapp | Montréal | Computer Consultants |
| Cogia | Montréal | Computer Consultants |
| Coin Acceptors Inc | Montréal | Information Technologies (IT) |
| Colgate-Palmolive Canada Inc. | Laval | Tout Entreprises et services |
| Colgilex R&D | Montréal | Information Technologies (IT) |
| Collins Aerospace Canada | Montréal | Tout Entreprises et services |
| Collège Canada | Centre-Ville | Tout Enseignement et savoir |
| Combustible | Montréal | Computer Networking |
Publicité (Desktop) Publicité (Mobile) |
| Come Couture | Laval | Couture, COUTURE |
| Commerce Montex | Montréal | Computer Room Setup, Protection, Equipment & Maintenance |
| Commerce xp Eastern Canada | Pointe-Claire | Auctions |
| COMMUNAUTE GRECQUE DE MONTREAL | Montréal | Blue Pages |
| Communauté Vietnamienne au Canada -... | Côte-Des-Neiges | Tout Communautés et société |
| Communication TÉcosystème Startup / Capital de risque (Venture capital) [39] Canada | Longueuil | Information Technologies (IT) |
| Compagnie 3M Canada | Ouest | Life Sciences and Health Technologies (LSHT) |
| Compagnie 3M Canada | Montréal | Life Sciences and Health Technologies (LSHT) |
| Compagnie d'études cliniques (Canada) Ltée | Pincourt | Life Sciences and Health Technologies (LSHT) |
| Compagnie Enablon Canada Inc | Montréal | Information Technologies (IT) |
