| DJ-Software | |
| DJC Systems | Victoria |
| DKG Creative Pty Ltd | Western Australia |
| Dlinkers | |
| DMC Marketing | |
| DNA Digital | New South Wales |
| DNGN | |
| Dobble Pty Ltd | |
| Doctor Disk Pty Ltd | Victoria |
| Document Management Tasmania Pty Ltd | Tasmania |
| DocuVision | New South Wales |
| Dodo Services Pty Ltd | Victoria |
| Doghouse Agency | Western Australia |
| Dolphin Software Pty Ltd | |
| Domain Central ANZ | Queensland |
| Domain Host Pty Ltd | Victoria |
| Domain Hosting Shop Pty Ltd | New South Wales |
| Domain Marketplace | Victoria |
| Domain.com.au | |
| DomainNames.com.au | Victoria |
| DomainsVilla.com | Queensland |
| Domani Digital | New South Wales |
| Dominate Digital Pty Ltd | |
| Donohue Consultancy | |
| dorsaVi Pty Ltd | Victoria |
| Dot Media Digital Solutions | Queensland |
| DotCollective | |
| Dotline Infotech Pty Ltd | New South Wales |
| Double Click Networks | New South Wales |
| Douugh Australia Pty Ltd | New South Wales |
| Dovetail Research Pty Ltd | New South Wales |
| Doyle Digital | Western Australia |
| DP Computing | South Australia |
| DPR&Co | |
| Dr App | |
| Drappier | |
| Draw Logo Design | |
| Drawboard Pty Ltd | |
| Drawcom | Victoria |
| Dream Consultancy Services Pty Ltd | Victoria |
| Dreamedia Creative | |
| DreamWalk Apps Pty Ltd | Queensland |
| DrewBytes | Australian Capital Territory |
| Drive Digital | Queensland |
| Drumbeat Pty Ltd | Queensland |
| DSPACE Pty Ltd | South Australia |
| DTI Group | Western Australia |
| DualSpark | |
| DUG Technology | |
| Duons Pty Ltd | Queensland |