| Indigo | |
| Infinity Mobile N.V. | |
| Influo N.V. | |
| Infor-Conseils | Hainaut |
| Inforef A.S.B.L. | Liège |
| Informate International N.V./S.A. | Limburg |
| Informex | |
| Infotek | Luxembourg |
| Inlecom | Brussels-Capital |
| Inloc S.A. | Walloon Brabant |
| Inmanta N.V. | |
| Innovation Sprint | |
| Innovedia.be | Limburg |
| Innoviris | |
| Inoopa S.A. | |
| Institut des Arts de Diffusion | |
| Instituts Saint-Luc - Bruxelles | |
| INTEGR8 | Flemish Brabant |
| Integral | Hainaut |
| InteGreat N.V. | West Flanders |
| Intelliga S.A. | Brussels-Capital |
| Intellinet | |
| Intellisol N.V. | |
| Interbyte | East Flanders |
| Interhost Solutions | Antwerp |
| Interlinea | East Flanders |
| Interlinie Webdesign | Antwerp |
| Internal Consulting Services | |
| International Council for Advertising Self-Regulation | |
| International Software Company | Walloon Brabant |
| Internet of Things Council | East Flanders |
| Internet Society Belgium | East Flanders |
| InternetVista S.A/N.V. | Walloon Brabant |
| Intersoft Electronics N.V. | Antwerp |
| Interuniversitair Micro-Electronica Centrum | Flemish Brabant |
| Intigriti | |
| Intix | |
| IntoTheWeb | |
| Intris N.V. | Antwerp |
| Intys Partners | |
| Inventures Investment Partners S.A. | |
| Inveo Consulting | Brussels-Capital |
| Invest Europe | Brussels-Capital |
| InvestSuite | Flemish Brabant |
| IP Nexia | Flemish Brabant |
| IPCOS | |
| IPTE Factory Automation N.V. | Limburg |
| IRC Engineering N.V. | East Flanders |
| IRIS | Walloon Brabant |
| Iristick | |