| Tadmur Contracting W.L.L. | Construction |
| Tadmur Trading W.L.L. | Industrial Manufacturing |
| TAG Engineering and Construction | Construction |
| Takyeef Electromechanical W.L.L. | Construction |
| Taleb Trading Co. W.L.L | Transport |
| Talenica Qatar | Services |
| Tamimi Global Company - Qatar | Food and Beverages |
| Tangram Gulf | Construction |
| Tanween Company W.L.L. | Real Estate |
| Target Logistics WLL | Transport |
| Target Trading & Agencies LLC | Services |
| Tariq Group International | Real Estate |
| Taylos Trading | Construction |
| Team International Trading & Contracting W.L.L | Industrial Manufacturing |
| Team Pro | Construction |
| Team Pro Qatar | Industrial Manufacturing |
| Team Trading Company WLL | Information Technology |
| Tech Hans Trading & Contracting | Construction |
| Techmark Project Company | Industrial Manufacturing |
| Technical Iron Works & Trading Co. w.l.l. | Industrial Manufacturing |
| Technical Laboratories | Services |
| TECHNICAL PARTS CO WLL | Information Technology |
| Technical Supplies & Services Co. W.L.L. | Transport |
| Techno Q | Telecommunications |
| Technochem Limited | Oil and Gas |