| Bab Ishtar Group Company W.L.L. | Construction |
| Backpacker for Trading & Services | Conglomerates |
| BackPacker IT Solutions Qatar | Conglomerates |
| Badr Contracting & Trading W.L.L | Construction |
| Bait Al-Mashura Finance Consultations | Financial Services |
| Bardawil Specialities Qatar W.L.L. | Industrial Manufacturing |
| Barq Construction Group W.L.L. | Construction |
| Barwa Bank Q.S.C. | Financial Services |
| Barwa Real Estate Company Q.S.C. | Real Estate |
| Basic Infrastructure Contracting & Trading Company | Construction |
| Bazlamit Furniture and Interior Design Company | Services |
| BBR Design | Construction |
| BD Consult | Services |
| Beauty factory | Services |
| BECON TRADING & CONTRACTING.W.L.L | Construction |
| Bee Global | Services |
| Behzad Group | Industrial Manufacturing |
| Benchmark Cleaning and Pest Control Services | Services |
| BENSHI TRADING & CONTG CO WLL | Services |
| Best Contractors | Construction |
| Bethel Professional Services | Services |
| Better Graph | Information Technology |
| Between the Two Bridges Co. WLL | Services |
| Beyond Lighting WLL | Industrial Manufacturing |
| Biewu International Trading | Industrial Manufacturing |