| Daemon | New South Wales |
| Daisee | New South Wales |
| Daisy Digital | |
| Daley Electronics Pty Ltd | Victoria |
| Damstra Technology | Victoria |
| DART Data Entry Services Pty Ltd | New South Wales |
| Darwinium Pty Ltd | |
| Dash Designs | Queensland |
| Dash Digital | Western Australia |
| Dashcams Direct | New South Wales |
| Data Action Pty Ltd | South Australia |
| Data Detect | New South Wales |
| Data Futurology | New South Wales |
| Data Recovery Now | Queensland |
| Data Recovery Services | Queensland |
| Data Republic | New South Wales |
| Data Sauce | Victoria |
| Data#3 Ltd | Queensland |
| Data.gov.au | Australian Capital Territory |
| Database By Design | Victoria |
| Database Consultants Australia | Victoria |
| Databasics | Queensland |
| Datacube Pty Ltd | Western Australia |
| DataDot Technology Ltd | New South Wales |
| Datafast | Queensland |
| Datalabs Agency | Victoria |
| Dataline ​Networks Pty Ltd | Victoria |
| Datalink Internet Systems Pty Ltd | Victoria |
| Datamine Software | Queensland |
| DataMystic | Victoria |
| DataOne | Queensland |
| Datapharm Australia | New South Wales |
| Dataplatz | Western Australia |
| Dataplex Pty Ltd | New South Wales |
| Datasearch Internet Services | Queensland |
| Datasonics | New South Wales |
| Datatime Services Pty Ltd | Victoria |
| DataTools Pty Ltd | New South Wales |
| Datawallet | New South Wales |
| Datawise Consulting Pty Ltd | Tasmania |
| Dataworld Australia | Victoria |
| Datgel Pty Ltd | New South Wales |
| Datisan Pty Ltd | Queensland |
| Dave Hall Consulting | Victoria |
| David O'Donnell Internet Marketer | Western Australia |
| DavidsonTech | Queensland |
| Davis Design | |
| Day3 Solutions Pty Ltd | Victoria |
| DB Engineers | Western Australia |
| DB Gurus Pty Ltd | New South Wales |