| Trillet.ai | |
| TriniTEQ International Pty Ltd | Western Australia |
| Trinity International Computers | New South Wales |
| Trionix IT | |
| Triple W Communications | New South Wales |
| Tritium | |
| Tritium Pty Ltd | Queensland |
| Triumph Business Systems Pty Ltd | |
| Troy Hunt | New South Wales |
| True Blue | |
| TrueAgent | |
| 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 |
| Tryptamine Therapeutics | |
| Tuckshop Software Pty Ltd | Victoria |
| Tundra | |
| Tuned Global | |
| Turnbull Web & Graphic Design | Queensland |
| Turnkey Website Solutions | Western Australia |
| Tutor Finder | |
| 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 |
| Twynam | |
| 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 do Sites | |
| U-Design | Queensland |
| UBC Web Design | Victoria |
| Uberband | New South Wales |
| Uberlink Corporation Pty Ltd | |
| Ubertech | New South Wales |
| Ubiquity Pty Ltd | Victoria |
| Ucidity | |
| UCWB | South Australia |
| Udio | |
| uDREW | |
| Ultimate IT | New South Wales |
| Ultimate IT Pty Ltd | |