| Technical Supplies & Services Co. W.L.L. | Transport |
| Technical Supplies & Services Co. W.L.L. | Transport |
| Techno Q | Telecommunications |
| Techno Q | Telecommunications |
| Technochem Limited | Oil and Gas |
| Technochem Limited | Oil and Gas |
| Technology for Electrical Services and Contracting W.L.L | Construction |
| Technology for Electrical Services and Contracting W.L.L | Construction |
| Technoserve W.L.L. | Information Technology |
| Technoserve W.L.L. | Information Technology |
| TECHNOWAVE LLC | Construction |
| TECHNOWAVE LLC | Construction |
| TEM-AC Trading & A/C Contracting WLL | Construction |
| TEM-AC Trading & A/C Contracting WLL | Construction |
| Temalco Contracting & Trading Company W.L.L | Construction |
| Temalco Contracting & Trading Company W.L.L | Construction |
| Tenpo Trading and Contracting Company W.L.L | Construction |
| Tenpo Trading and Contracting Company W.L.L | Construction |
| TeraNet Technologies | Information Technology |
| TeraNet Technologies | Information Technology |
| Terratest Qatar International Drilling Group | Construction |
| Terratest Qatar International Drilling Group | Construction |
| Test & Measurement Solutions Ltd. WLL | Industrial Manufacturing |
| Test & Measurement Solutions Ltd. WLL | Industrial Manufacturing |
| Texas A&M University at Qatar | Education |
