| The Modern Advertising Center | Media |
| The Pearl Qatar Company O.M.C. | Real Estate |
| The Ritz-Carlton, Doha | Leisure and Tourism |
| The St. Regis Doha | Leisure and Tourism |
| The Taleb Group Of Companies | Real Estate |
| Thermal Arabia WLL | Construction |
| Thousands Rent A Car | Transport |
| Three Lines Shipping & Logistics WLL | Transport |
| Three Lines Shipping & Transport W.L.L | Conglomerates |
| Tietan Fiberglass Company W.L.L | Industrial Manufacturing |
| TINSUKIA TRADING & CONTRACTING W.L.L. | Conglomerates |
| TNT Courier & Cargo | Transport |
| Top Printers | Media |
| Topline Group | Services |
| touag | Retail |
| Townscape Trading and Contracting | Construction |
| Trading & Agency Services Limited WLL | Construction |
| Trading Marketing Contracting W.L.L | Industrial Manufacturing |
| Traffic Tech (Gulf) W.L.L. | Telecommunications |
| Trags Electrical Engineering & Air Conditioning Company | Construction |
| Trans Orient Holding Company | Leisure and Tourism |
| Transind Holdings | Food and Beverages |
| Trelco Building Materials Co. | Construction |
| Trelco Limited Company W.L.L. | Construction |
| Trelco Technical Services W.L.L. | Information Technology |
