| Cabaco Trading & Contracting | Conglomerates |
| Cabaco Trading & Contracting | Conglomerates |
| CABz Transport | Transport |
| CABz Transport | Transport |
| Caliber Trading Agencies & Franchising | Conglomerates |
| Caliber Trading Agencies & Franchising | Conglomerates |
| Caliber Trading Agencies & Franchising LLC | Real Estate |
| Caliber Trading Agencies & Franchising LLC | Real Estate |
| Candela Lighting | Retail |
| Candela Lighting | Retail |
| Capital Insurance Brokers L.L.C. | Financial Services |
| Capital Insurance Brokers L.L.C. | Financial Services |
| CARDIFF LOGISTICS WLL | Transport |
| CARDIFF LOGISTICS WLL | Transport |
| Care Well International Trading | Information Technology |
| Care Well International Trading | Information Technology |
| Carillion (Qatar) L.L.C | Construction |
| Carillion (Qatar) L.L.C | Construction |
| Carnegie Mellon University Qatar | Education |
| Carnegie Mellon University Qatar | Education |
| Casadel Gelato | Food and Beverages |
| Casadel Gelato | Food and Beverages |
| CASTELLO - Cast Aluminium Company-Qatar | Industrial Manufacturing |
| CASTELLO - Cast Aluminium Company-Qatar | Industrial Manufacturing |
| Castle Constructions WLL | Construction |
