| Bios Computer | Consumer Goods |
| Bitumode Qatar Waterproofing Factory | Industrial Manufacturing |
| Black Cat Engineering & Construction W.L.L. | Construction |
| Black Pearl Company W.L.L. | Industrial Manufacturing |
| Blink Company W.L.L. | Services |
| Blue Cacti Solutions | Services |
| Blue Crescent Engineering Trading & Contracting WLL zeus | Construction |
| BlueSalon | Consumer Goods |
| Bluray Advertising | Media |
| Bojamhoor Trading & Contracting Company W.L.L | Construction |
| Bolts & Tools Center | Industrial Manufacturing |
| Boodai Trading Company Ltd. WLL | Industrial Manufacturing |
| Boom General Contractors Company | Construction |
| Brentford Group | Conglomerates |
| Bridge EMC LLC | Construction |
| Bridgeway Technical Services Co WLL | Construction |
| Bright Engineering W.L.L | Construction |
| Bright Engineering.W.L.L | Construction |
| Brite Dental Centre | Health Care |
| Brk Trading & Transport Company | Transport |
| Brown Wood Contracting Co. WLL | Construction |
| Budget Rent a Car-Qatar | Transport |
| Builders Advanced Engineering & Construction | Construction |
| Buildmore-Group | Construction |
| Built In Contracting & Trading W.L.L | Construction |
