| KNEET | |
| KNX Association | Brussels-Capital |
| Konekt S.P.R.L. | Brussels-Capital |
| Koninklijke Vlaamse Academie van België | |
| Korazon | West Flanders |
| KPD Services N.V. | Limburg |
| Kpler | |
| Kresoft Systems | East Flanders |
| KSL | Namur |
| KU Leuven | Flemish Brabant |
| KU Leuven - Computer Security and Industrial Cryptography group | Flemish Brabant |
| KU Leuven - Department Computerwetenschappen | Flemish Brabant |
| KU Leuven - Department Elektrotechniek | Flemish Brabant |
| KU Leuven - Department of Mathematics | Flemish Brabant |
| KU Leuven - Hoger Instituut voor Wijsbegeerte | Flemish Brabant |
| KYOCERA Document Solutions Belgium N.V. | Flemish Brabant |
| Lab Box | |
| Lab9 Stores B.V.B.A. | East Flanders |
| Laboratoires SMB S.A. | |
| Laboratory of Computational Biology | |
| Lancr | |
| Landschoot.be | East Flanders |
| Lansweeper | East Flanders |
| Laptop-Shop.be | East Flanders |
| Lason Media | East Flanders |
| LASystems.be | Flemish Brabant |
| LC2 S.P.R.L. | Brussels-Capital |
| LCL Belgium N.V. | Flemish Brabant |
| LCR Telecom N.V. | Antwerp |
| Lean Fund S.A./N.V. | |
| LEDS React | |
| Legend Software | Walloon Brabant |
| Lesterius | East Flanders |
| Level27 B.V. | Limburg |
| Levelapp | |
| Lexitech | |
| LHM N.V. | Antwerp |
| LIEGE science park | Liège |
| Lifepowr N.V. | Antwerp |
| lifetech.brussels | |
| Limecraft | |
| Linux Belgium B.V.B.A. | Flemish Brabant |
| Linux User Group de la ville de Namur | Namur |
| Lobbi | |
| Logicalsys | Walloon Brabant |
| Logidrive | Walloon Brabant |
| LoLiGrUB A.S.B.L. | Hainaut |
| Look & Fin S.A. | |
| Louvain-la-Neuve Science Park | Walloon Brabant |
| LRM | |