| Go Creations | |
| Great Way Καλαμάτα | Attica |
| Greek Fintech Cluster | |
| Greek Internet Marketing | Attica |
| Greek Venture Capital Association | |
| GreekChat | Attica |
| Grigoria | Attica |
| GRIX | Attica |
| Grixel | Attica |
| GRNET | |
| Grog Mobile Greece | Attica |
| GSP | Attica |
| Guru-host GR | Attica |
| Hackerspace.gr | Attica |
| Harbor Lab S.A. | Attica |
| HEALIS - Health Information Systems/Services | Attica |
| HEL.L.U.G. | Attica |
| Hellas Direct | |
| Hellas Sat | |
| Hellasgrid | Attica |
| Hellassites | Attica |
| Hellenic Artificial Intelligence Society | Attica |
| Hellenic Capital Market Commission | |
| Hellenic Impact Investing Network | |
| Hellenic Space Center | Attica |
| Hellenic Technology of Robotics | |
| Hellenic Telecommunications and Post Commission | Attica |
| Help Pharmaceuticals S.A. | |
| Hostdog | Attica |
| Hosthub | Attica |
| Hostivate | Central Macedonia |
| Hostmein Cloud Hosting | |
| Hostsun | Crete |
| HotelCrux | Attica |
| Hyper Center | Attica |
| Hyper Hosting | Attica |
| Hypersystems | |
| Hypertech IT Solutions | Attica |
| i-DOCS | Attica |
| I.S.T. - Information Systems Technology Ltd | Attica |
| i4G | |
| i4g | |
| Iarts | Attica |
| ICAP CRIF | Attica |
| IDSS | |
| iforU | |
| iGROUP Πληροφορική Ε.Π.Ε. | Attica |
| iGuRu Νέα | Attica |
| Impression eStudio | Attica |
| Industry Disruptors | Attica |