| Intelligent Transport Systems Australia | Victoria |
| Intellis Pty Ltd | Victoria |
| Intelliwolf | Western Australia |
| InteractCard | Victoria |
| Interactive | Victoria |
| Interactive Images | Queensland |
| InteractSport Pty Ltd | Victoria |
| Intercel Pty Ltd | Victoria |
| Interconnections | Victoria |
| Interface Solutions | New South Wales |
| InterK Peptide Therapeutics | New South Wales |
| Interlogic Placements | New South Wales |
| Intermast IT Solutions | Tasmania |
| International Capital Markets Pty Ltd | |
| International Training & Management Pty Ltd | South Australia |
| Internet Association of Australia | Western Australia |
| Internet Information Group | Queensland |
| Internet Macintosh User Group, Inc. | Victoria |
| Internode | South Australia |
| Intersect | South Australia |
| Intersect Australia Ltd | New South Wales |
| Intertec Consulting | |
| Intertech Country | South Australia |
| InterValley Ventures | Victoria |
| Interworld Electronics | Victoria |
| Intesols | |
| Intitio Pty Ltd | New South Wales |
| InTouch Web Services | New South Wales |
| Intra Tec | New South Wales |
| Intrac Australia Pty Ltd | New South Wales |
| Intresto Pty Ltd | New South Wales |
| Intuitive IT | |
| Intuji | Western Australia |
| Inventia Life Science Pty Ltd | |
| Inveress Web Development | South Australia |
| Invest Victoria | Victoria |
| Investible Pty Ltd | New South Wales |
| Investment NSW | New South Wales |
| Invigor Group | New South Wales |
| Invisible Ink Pty Ltd | New South Wales |
| Ionata Digital | Tasmania |
| iOnline Pty Ltd | Queensland |
| IoT Alliance Australia Ltd | New South Wales |
| iP Edge | New South Wales |
| IP Telco | Queensland |
| IP Trading Pty Ltd | New South Wales |
| iPrimus Telecommunications Pty Ltd | Victoria |
| ipSCAPE | New South Wales |
| IQ PC Services Pty Ltd | Western Australia |
| IR | New South Wales |