| TPG Telecom | New South Wales |
| TR Telecom | Victoria |
| Traff1k D1g1tal | New South Wales |
| Transgrid | New South Wales |
| Trapdoor Media | |
| Treeaus | Queensland |
| Trend Care Systems Pty Ltd | Queensland |
| Triase Computer Solutions | South Australia |
| Trickle | New South Wales |
| Trident Technology Solutions | Victoria |
| TriniTEQ International Pty Ltd | Western Australia |
| Trinity International Computers | New South Wales |
| Triple W Communications | New South Wales |
| Tritium | |
| Tritium Pty Ltd | Queensland |
| Troy Hunt | New South Wales |
| Trueblue Systems | Western Australia |
| TruePillars Pty Ltd | Victoria |
| Truescope Operations Pty Ltd | New South Wales |
| Truis | Queensland |
| Trusted impact Pty Ltd | Victoria |
| Truuth | New South Wales |
| Try & Byte Australia | New South Wales |
| Tuckshop Software Pty Ltd | Victoria |
| Tuned Global | |
| Turnbull Web & Graphic Design | Queensland |
| Turnkey Website Solutions | Western Australia |
| Tweak my Website | Victoria |
| Twidium | Western Australia |
| Twitly | Australian Capital Territory |
| Two in a Room Studios | New South Wales |
| Two Moons | |
| Two Tongue Technology | New South Wales |
| TX Digital | Victoria |
| Typequick Pty Ltd | New South Wales |
| Tyro Payments Ltd | New South Wales |
| Tyssen Design | Queensland |
| U Can C Pty Ltd | New South Wales |
| U-Design | Queensland |
| ubank | |
| UBC Web Design | Victoria |
| Uberband | New South Wales |
| Uberlink Corporation Pty Ltd | |
| Ubertech | New South Wales |
| Ubiquity Pty Ltd | Victoria |
| UCWB | South Australia |
| Ultimate IT | New South Wales |
| Ultra Commerce Internet Pty Ltd | New South Wales |
| Ultradata | Victoria |
| Unearthed Solutions | Western Australia |