| Creative Factory | Victoria |
| Creative Generals Pty Ltd | |
| Creative Intersection | Queensland |
| Creative Mode | Queensland |
| Creative Web Tech | |
| Creative Wolf | |
| CreativeCubes.Co Pty Ltd | Victoria |
| CreativityCorp Pty Ltd | Western Australia |
| Creator Winning Web Services | Victoria |
| Credit Clear | Victoria |
| Crendal Computing international Pty Ltd | New South Wales |
| CriticalArc | |
| Criticone | Victoria |
| CRM Online Australia Pty Ltd | Western Australia |
| CRN Australia | New South Wales |
| CRObar Optimisation Pty Ltd | |
| CrossBar Media | New South Wales |
| Crow Clinical | Queensland |
| Crucial Paradigm Pty Ltd | New South Wales |
| Crunchy Digital | |
| Crux Biolabs Pty Ltd | Victoria |
| Cryosite Ltd | |
| Crystal IT | Queensland |
| CSE Technology Pty Ltd | New South Wales |
| CSIRO | Australian Capital Territory |
| CSL Behring | Victoria |
| CSO Australia | New South Wales |
| CTI Recruitment | New South Wales |
| Cube Exchange Australia Pty Ltd | |
| Cultivate Digital | Victoria |
| Culture Amp Pty Ltd | Victoria |
| Curicon Pty Ltd | |
| Curious Thing AI | |
| Currinda Pty Ltd | Victoria |
| Currus Biologics Pty Ltd | Victoria |
| Curtin College | |
| Curtin University | Western Australia |
| Curtin University - School of Electrical Engineering, Computing and Mathematical Sciences | Western Australia |
| Custom Easy Pty Ltd | New South Wales |
| Customer Science Group | |
| Cuttable | |
| CVW Creative | |
| CXi Software Pty Ltd | Victoria |
| Cyanweb | Western Australia |
| Cyber Interchange Australia | New South Wales |
| Cyber Networks | |
| CyberHound Pty Ltd | Queensland |
| Cybernet Evolution Pty Ltd | Queensland |
| CyberOxide | |
| CyberSecOn Pty Ltd | Victoria |