| 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 |
| Hochschule für Agrar- und Umweltpädagogik | |
| Hofstädtler Industrie-Electronic GmbH | Lower Austria |
| hokify GmbH | |
| Holztechnikum Kuchl BetriebsgmbH | |
| Homestage | Vienna |
| Horus IT GmbH | Salzburg |
| Hostmacher | |
| HostProfis ISP Telekom GmbH | Carinthia |
| Hoststar – Multimedia Networks | Styria |
| HOTdomains Internet Service | Lower Austria |
| hotelkit GmbH | |
| hotze.com GmbH | Tyrol |
| HPL Software KG | Styria |
| HR Force EDV-Beratung GmbH | Vienna |
| HROS | |
| HTA Austria - Austrian Institute for Health Technology Assessment GmbH | |
| Humai Technologies GmbH | Vienna |
| Hutter & Schrantz AG | |
| Hydrogrid GmbH | |
| Hyperwave GmbH | Styria |
| Hypest Hive GmbH | |
| i-netservice.at | Styria |
| i2b – ideas to business | |
| i4g Investment GmbH | |
| i5invest Beratungs GmbH | Vienna |
| i5Next | Vienna |
| IAS Ing. Salcher GmbH | Styria |
| IBB Adaptive Solutions GmbH | Vienna |
| IC INTRACOM Vertriebs GmbH | Styria |