| Dejan Consulting | |
| Dejan Marketing | |
| Dekon | |
| Delacon | New South Wales |
| Delineate Platforms Pty Ltd | |
| Deliverit | Victoria |
| Deloosh Pty Ltd | Victoria |
| Delta Sierra Consulting | |
| Demand Management Systems Pty Ltd | New South Wales |
| Demon-Host | Queensland |
| Demonz | New South Wales |
| Denis Koo | |
| Denver Technology | |
| deployable.co | Queensland |
| Depot IT | New South Wales |
| Deputy | New South Wales |
| Descartes Localz | Victoria |
| Descrete Australia Pty Ltd | New South Wales |
| Desert Scientific Software | New South Wales |
| Design Ark | |
| Design By Mouse | New South Wales |
| Design Fox | |
| Design Grid Pty Ltd | |
| Design Industries | Victoria |
| Design Point | Victoria |
| Design.com | |
| design4u Creations | New South Wales |
| DesignCrowd | New South Wales |
| Designpluz Pty Ltd | New South Wales |
| DesignsenseWeb | Victoria |
| Desygner | Queensland |
| Develop IT | Western Australia |
| Devkind Pty Ltd | |
| Devolution Web Design + Hosting | Victoria |
| DevOps Talks Conference | New South Wales |
| Devotion Digital Pty Ltd | |
| DevStack | Queensland |
| DevsTree Australia | |
| DevVibe | |
| Dewacorp Australia Pty Ltd | |
| Dewar Electronics Pty Ltd | Victoria |
| DEWC Systems | |
| DFSM Technologies | New South Wales |
| DGreat Solutions | South Australia |
| DHRP | |
| DHS International Pty Ltd | New South Wales |
| DI Management Services | |
| DI Management Services Pty Ltd | New South Wales |
| Diag-Nose Medical | |
| Diag-Nose.io | |