| Chemtech Trading W.L.L | Industrial Manufacturing |
| chill service trading and contracting qatar | Conglomerates |
| Chillservice Trading & Contracting | Industrial Manufacturing |
| Chip Qatar Solution Trading & Contracting WLL | Information Technology |
| Chiyoda Almana Engineering LLC | Construction |
| CICO Consulting Engineers | Construction |
| Circle Qatar Ltd | Services |
| City Center Doha | Real Estate |
| City Elevators & Escalators Co.W.L.L | Construction |
| City Exchange Company WLL | Financial Services |
| City Media | Media |
| Civil Aviation Authority - Qatar | Governmental Institutions |
| CLASSIC DOME | Construction |
| Cleopatra Trading & Contracting Company | Construction |
| Cleopatra Travels | Leisure and Tourism |
| Coastal Qatar | Conglomerates |
| Coastal Trading & Engineering Company W.L.L | Construction |
| Cofely Besix Mannai Facility Management LLC | Real Estate |
| Collaborative Endeavour Contracting Co WLL | Conglomerates |
| College of the North Atlantic - Qatar | Education |
| Colors & More | Media |
| Commercial Bank Financial Services (L.L.C.) | Financial Services |
| Commitement Engineering Works | Construction |
| COMMITMENT ENGG. WORKS | Construction |
| Commodore Qatar Contracting Company L.L.C. | Construction |
