| HL7 Australia | Australian Capital Territory |
| Holding Redlich | Victoria |
| Holmes Institute | Victoria |
| Holmesglen Institute of TAFE | |
| Home Money Manage | Western Australia |
| HomePage Development | Queensland |
| Honest Fox | |
| Hopping Mad Designs Pty Ltd | New South Wales |
| Hopscotch Media Pty Ltd | Victoria |
| HordernIT | |
| Horizon Wireless | New South Wales |
| Hornet Marketing | |
| Hornsby TAFE IT Department | New South Wales |
| Host Group of Companies Pty Ltd | Queensland |
| HostAway | |
| Hostnexus | Victoria |
| Hot Time Software | Queensland |
| Hot Toner | New South Wales |
| HotAir Conferencing Pty Ltd | Victoria |
| HotDoc Online Pty Ltd | Victoria |
| Hotline IT | New South Wales |
| Hotmix Group | Western Australia |
| Hotpink Websites | Queensland |
| Hotstart Software | Western Australia |
| House Digital | Western Australia |
| Housley Communications Pty Ltd | New South Wales |
| Howling Frog | New South Wales |
| HS Coms Digital | |
| Hub Australia | Victoria |
| Hubway | New South Wales |
| Hudson Institute of Medical Research | |
| Humaan | |
| Human Digital | New South Wales |
| Human Edge Software Corporation Pty Ltd | Victoria |
| Human Element IT Pty Ltd | Victoria |
| Human IT | Victoria |
| Human Pixel Pty Ltd | Victoria |
| Humaniti | New South Wales |
| Huon IT | New South Wales |
| Hutchinson Software Pty Ltd | New South Wales |
| Hutchison Telecommunications (Australia) Ltd | New South Wales |
| Hy-Q International (Australia) Pty Ltd | Victoria |
| Hybrid Electronics Australia Pty Ltd | Victoria |
| Hype Marketing | |
| Hype Studio | |
| Hyper Startup Studio | |
| Hyperactive Design | Queensland |
| Hyperdyne Software | Queensland |
| HyperWrite Pty Ltd | Victoria |
| Hyprfire | |