| Gtelecom Pty Ltd | Victoria |
| GTP iCommerce Pty Ltd | Western Australia |
| GuardWare Australia Pty Ltd | New South Wales |
| Guava Treasury | Western Australia |
| GUI Computing | Victoria |
| Gumnut Systems | New South Wales |
| GWM | Victoria |
| Gyder Surgical | |
| G’Day Broadcast | |
| H-bar | Victoria |
| H2 Ventures Pty Ltd | New South Wales |
| Hacker Target Pty Ltd | Australian Capital Territory |
| Hackerspace Adelaide | South Australia |
| HackHunter | Victoria |
| Haimat | |
| Halfbrick Studios | Queensland |
| Hall Computer Services | Queensland |
| HALO Technologies Pty Ltd | |
| Halogenics Pty Ltd | Victoria |
| HAMB Systems Ltd | South Australia |
| Hamma.Digital | Victoria |
| Hammer Software | Tasmania |
| Hammond Street Developments Pty Ltd | Victoria |
| Handsome Creative | |
| Hantrex Australian Digital TV | Victoria |
| HarbourIT | New South Wales |
| HARD software | Victoria |
| Hard Web AdPad | Queensland |
| Hardware & Systems Sales Pty Ltd | New South Wales |
| Harmonic New Media | Western Australia |
| Harrison McMillan Pty Ltd | South Australia |
| Harrison Multimedia | New South Wales |
| Harrison.ai | New South Wales |
| HarveyBrothers | Queensland |
| Hashching Ltd | New South Wales |
| Hastings Data Loggers | New South Wales |
| Hatch Quarter | Victoria |
| Hatchet Pty Ltd | Western Australia |
| Hatfield Integrated Technologies | Queensland |
| Have I Been Pwned | |
| Haventec | New South Wales |
| Haystack Australia Pty Ltd | |
| HCP Software Pty Ltd | Western Australia |
| Headset Solutions | New South Wales |
| Headsetsplus | New South Wales |
| Health Communication Network | New South Wales |
| Health Informatics Society of Australia Ltd | Victoria |
| Health Information Management Association of Australia Ltd | New South Wales |
| Healthcare Software | Tasmania |
| Healthengine Ltd | Western Australia |