| Scientific & Technical Services Company W.L.L | Health Care |
| Sea Gulf Trading & Contracting WLL | Construction |
| Sealand Marine Services Qatar | Conglomerates |
| Sealine Beach Resort | Leisure and Tourism |
| Sealine Manpower Recruitment | Services |
| Season Engineering Group | Services |
| Seattle Trading and Contracting Company W.L.L | Conglomerates |
| Seaworks Company | Construction |
| Security - Safety & Trading Center | Industrial Manufacturing |
| Seebeck International Trading Company W.L.L | Industrial Manufacturing |
| Seef Limited Q.S.C. | Oil and Gas |
| SEIB Insurance & Reinsurance Company LLC | Financial Services |
| Seko Logistics | Transport |
| Self Drive Car Rental WLL | Transport |
| SEMAC QATAR W.L.L | Services |
| Sendian Group | Conglomerates |
| Sentor Electrical Trading | Construction |
| Serve You On System | Information Technology |
| SERVYOND Group, Qatar | Conglomerates |
| Seven Hills Trading & Contracting W.L.L | Construction |
| SEVEN STARS TRADING & GENERAL SERVICES | Conglomerates |
| Severn Glocon Qatar | Conglomerates |
| Shafqat Building Materials WLL | Construction |
| Shaheen Electrical Works & Trading W.L.L | Industrial Manufacturing |
| Shaheen Jewellery WLL | Conglomerates |
