| Grommunio | Vienna |
| Gropyus AG | |
| Grow Your Startup | |
| GRZ IT Center Linz GmbH | Upper Austria |
| GTech Automatisierungstechnik GmbH | |
| H.Stocker GmbH | |
| H82 medientechnik GmbH | Vienna |
| Hack the Crisis Austria | |
| HAKOM Solutions GmbH | Vienna |
| HALE electronic GmbH | Salzburg |
| Halli Data GmbH | Salzburg |
| Han Anlagenbau GmbH | |
| Hansmen Group | Vienna |
| Happylab GmbH | |
| HappyMed GmbH | |
| Hard- und Software GmbH Nfg KG | Carinthia |
| Hartlauer Handelsgesellschaft mbH | Upper Austria |
| Haschek Solutions | |
| Haude Electronica Verlags GmbH | Vienna |
| HD Immune | |
| Healcloud | |
| Health Hub Vienna | |
| Health Tech Hub Styria Pitch & Partners | |
| HeartBeat.bio AG | |
| Heilig & Schubert Software AG | Vienna |
| Heinz Möller | Vienna |
| Helu.io GmbH | |
| Hensoldt Analytics GmbH | |
| Herd AON GmbH | |
| Hermes Software GmbH | Upper Austria |
| Herminengasse1 | |
| Hero | |
| heureka - IT works | Vienna |
| Heylog GmbH | |
| Hgisystems IT OG | Vorarlberg |
| HI-TECH for Gamers | Upper Austria |
| hi.health GmbH | |
| HI1 digital marketing | Vienna |
| HID GmbH | Vorarlberg |
| HIGH ORDER Computersysteme | Upper Austria |
| HighLine Ventures GmbH | |
| Hirschmann Automotive GmbH | Vorarlberg |
| Hirtenberger Defence Europe GmbH | |
| HK Incube | |
| HM&S IT-Consulting GmbH | Styria |
| Hobex AG | Salzburg |
| Hofstädtler Industrie-Electronic GmbH | Lower Austria |
| hokify GmbH | |
| Homestage | Vienna |
| Horus IT GmbH | Salzburg |