| Todo.vu | Queensland |
| Tomizone Ltd | New South Wales |
| TOMORROW Super | New South Wales |
| Tonberry Digital | New South Wales |
| Top Education Group Ltd | |
| Top End Websites | |
| Top Rank Designs | Western Australia |
| Top Rankings | Victoria |
| Top SEO Pages | Western Australia |
| Top SEO Sydney Pty Ltd | New South Wales |
| Top Spot SEO | |
| Top Tradie Websites | Queensland |
| Top4 Marketing Pty Ltd | |
| Topfive Designs | Victoria |
| Topologi | New South Wales |
| TopSEO Brisbane | |
| Toro Cloud Pty Ltd | New South Wales |
| Torque IT Pty Ltd | Western Australia |
| Torrens University | New South Wales |
| Torrens University Australia Ltd | |
| Tortoise & Hare | |
| Tortoise Marketing Australia | |
| Torus Games | Victoria |
| Total Metrics | Victoria |
| Total Telco Group | |
| Totally Business Software Pty Ltd | |
| Totalwebsites Pty Ltd | New South Wales |
| Touch Panel Control Ltd | Queensland |
| Tower Hill Automation | Victoria |
| Townsville Computer Recyclers | Queensland |
| Townsville Linux Users Group | Queensland |
| TPG Telecom | New South Wales |
| tpsTech | |
| TR Business Consulting Pty Ltd | |
| TR Telecom | Victoria |
| Track'em | |
| Traff1k D1g1tal | New South Wales |
| Traffic Radius | |
| Traffio | |
| Trajan Group | |
| Transgrid | New South Wales |
| Trapdoor Media | |
| Treeaus | Queensland |
| Trend Care Systems Pty Ltd | Queensland |
| Trendii | |
| Triase Computer Solutions | South Australia |
| Tribalism | |
| Trickle | New South Wales |
| Trideca | |
| Trident Technology Solutions | Victoria |