| Kodehyve | |
| KoosmiK | |
| Koosmik Corporation | |
| Kulczyk Investments S.A. | |
| KYC3 | Luxembourg |
| Laboratoire national de santé | |
| Labsolution | |
| Laurence Vagner | Luxembourg |
| Letzebuerg.net | Esch-sur-Alzette |
| Level2 | Luxembourg |
| LHoFT Foundation | Luxembourg |
| LIAN Group | |
| Lightigo Space S.à r.l. | |
| Linc S.A. | Redange |
| Lineheart S.à.r.l. | Esch-sur-Alzette |
| Linsys S.A. | Esch-sur-Alzette |
| Linux User Group Luxembourg | Luxembourg |
| LMO Space | |
| Löffler S.à.r.l. | Luxembourg |
| Logiconsult S.A. | Esch-sur-Alzette |
| Losch Digital Lab | |
| Low Energy Consulting | |
| LU-CIX | Esch-sur-Alzette |
| Lux-IT S.A. | Esch-sur-Alzette |
| LuxAI S.A. | Luxembourg |
| LuxApps | Capellen |
| Luxcad | Luxembourg |
| LuxConnect S.A. | Esch-sur-Alzette |
| Luxcontrol | |
| Luxembourg Blockchain Lab | |
| Luxembourg Business Angel Network | Luxembourg |
| Luxembourg House of Cybersecurity | |
| Luxembourg Institute of Health | |
| Luxembourg Institute of Science & Technology | Esch-sur-Alzette |
| Luxembourg National Research Fund | |
| Luxembourg Online S.A. | Luxembourg |
| Luxembourg Open Innovation Club | Luxembourg |
| Luxembourg Private Equity & Venture Capital Association | Luxembourg |
| Luxembourg School of Business | Luxembourg |
| Luxembourg Space Agency | Luxembourg |
| Luxembourg Space Tech Angels | |
| Luxembourg Tech School | Luxembourg |
| Luxembourg Trade & Invest | |
| Luxembourg-City Incubator | Luxembourg |
| LuxGovSat S.A. | |
| LuxHosting Networks S.à.r.l. | Luxembourg |
| Luxhub | |
| Luxinnovation | Esch-sur-Alzette |
| LuxMobility S.à r.l. | |
| LuxNetwork S.A. | Luxembourg |