| Caffeinate Digital | |
| Cairnmillar Institute | |
| Cairns-Copy | Queensland |
| Calcul8ors | |
| Calibre Analytics | Victoria |
| Calico | |
| Calidad Distributors Pty Ltd | New South Wales |
| Call Dynamics Pty Ltd | |
| Callbox | |
| Calumino | New South Wales |
| Calvert Technologies | South Australia |
| Calxa Australia Pty Ltd | Queensland |
| Cambia | |
| Cambium Bio Ltd | |
| Cambridge Informatics | New South Wales |
| Camms | |
| Campad Electronics | Queensland |
| Campaignware Pty Ltd | |
| Campaing Digital Pty Ltd | New South Wales |
| Campion College Australia | |
| Canary IT Solutions | New South Wales |
| Canberra Data Centres Pty Ltd | Australian Capital Territory |
| Canberra Innovation Network | Australian Capital Territory |
| Canberra Institute of Technology | |
| Canberra Linux Users Group | Australian Capital Territory |
| Canberra Technology Park | Australian Capital Territory |
| Canberra Web | |
| CanberraNet Pty Ltd | |
| Candela.info | New South Wales |
| Canon Australia Pty Ltd | New South Wales |
| Canopus Networks | New South Wales |
| Canterbury Partners Pty Ltd | |
| Canthera Discovery Ltd | Victoria |
| Canva | New South Wales |
| Canvas Digital Pty Ltd | New South Wales |
| Cap Connect | Queensland |
| Capax Technology | New South Wales |
| Cape Pty Ltd | New South Wales |
| Capital Information Services | New South Wales |
| Capital Office Business Software | New South Wales |
| Capital Partners Consulting Pty Ltd | Western Australia |
| CapitalRoad Financial Pty Ltd | Victoria |
| Capricorn Space Pty Ltd | |
| Capsifi | |
| Captovate | |
| CAPTUR3D | |
| Carbon Edge | |
| Carbon Offset by Greenfleet | New South Wales |
| Card Acess Services Pty Ltd | New South Wales |
| CardieX Ltd | New South Wales |