| Command Computers | New South Wales |
| Command Software Pty Ltd | Queensland |
| Commandacom | Western Australia |
| CommandHub Pty Ltd | Victoria |
| Commerce Plus Pty Ltd | New South Wales |
| Commerce Vision | |
| Common Sense Ventures | Victoria |
| CommsChoice | New South Wales |
| Commsday | New South Wales |
| CommsNet Group | Australian Capital Territory |
| CommTel Network Solutions | Victoria |
| Communicat Business Systems | Victoria |
| Communications Alliance Ltd | New South Wales |
| Communications Design & Management | New South Wales |
| Compare and Merge | South Australia |
| Compass Education Pty Ltd | |
| CompeteShark | New South Wales |
| Complas Web Design & Hosting | Victoria |
| Complete Cloud | New South Wales |
| Complete Data Recovery | Victoria |
| Complete PC Solutions | Victoria |
| Complete Phase Consulting | Victoria |
| Complete Phase CRO | Victoria |
| Compliance Quarter | |
| Complii FinTech Solutions Ltd | New South Wales |
| Compoint Computers | New South Wales |
| Components Only Pty Ltd | |
| ComponentSpace | Queensland |
| Compu-Stor | Western Australia |
| Compucon Computers SA Pty Ltd | South Australia |
| Compumedics Ltd | Victoria |
| Compusoft Australia Pty Ltd | New South Wales |
| Computer Aid | Queensland |
| Computer Alliance | Queensland |
| Computer Bits | South Australia |
| Computer Components Pty Ltd | New South Wales |
| Computer Consultant Professionals | |
| Computer Doctor Pty Ltd | Queensland |
| Computer Forensics Experts | Victoria |
| Computer Graphics Society | South Australia |
| Computer Helper Pty Ltd | Victoria |
| Computer Mechanics | Western Australia |
| Computer One Australia | |
| Computer Rental | New South Wales |
| Computer Repairs Brisbane | |
| Computer Researcy & Technology | New South Wales |
| Computer Services Group | Queensland |
| Computer Smiths Pty Ltd | New South Wales |
| Computer Support Professionals | New South Wales |
| Computer Trader | Tasmania |