| BDE Service Center | Hainaut |
| Beatswitch | |
| Bee Computing | Namur |
| BeeBole | Brussels-Capital |
| Beecom | East Flanders |
| Beeple | Antwerp |
| Behostings.com | Walloon Brabant |
| Belcenter | Walloon Brabant |
| Belgian Association of Marketing | Flemish Brabant |
| Belgian Java User Group | Brussels-Capital |
| Belgian Mathematical Society | Brussels-Capital |
| Belgian Mobile ID S.A./N.V. | |
| Belgian National Internet eXchange | Brussels-Capital |
| Belgian RISC OS user group | Antwerp |
| BelgianTelecom | Antwerp |
| Belgisch Instituut voor postdiensten en telecommunicatie | Brussels-Capital |
| Belgium Data Recovery | |
| Belighted | Walloon Brabant |
| Bells | Limburg |
| Belnet | Brussels-Capital |
| Belram N.V./S.A. | Brussels-Capital |
| Beltug | East Flanders |
| BeMobile | |
| Bene.be | East Flanders |
| Benoit Elektronika N.V. | West Flanders |
| Benoit Libert | Namur |
| Berlin Creative Studio | |
| BICS SA/NV | Brussels-Capital |
| Big Data Technologies and Applications | East Flanders |
| Bigtower | Liège |
| Bio-Incubator Leuven | Flemish Brabant |
| Biocartis N.V. | |
| BioSenic S.A. | |
| BioSenic S.A. | |
| BioStrand | |
| BioVille | |
| Bioxodes | |
| BIPT - IBPT | Brussels-Capital |
| Birdhouse | |
| BISC Global | |
| Bisoft | |
| BIT Computers | East Flanders |
| Bit IT Consultancy | |
| BIT Services | |
| BitLess B.V.B.A. | |
| Bits & Bytes N.V. | Limburg |
| Bits of Love | |
| BizzDev S.A. | |
| BKM | Limburg |
| bkweb | Liège |