| Datacube Pty Ltd | Western Australia |
| DataDot Technology Ltd | New South Wales |
| DataFactory | |
| Datafast | Queensland |
| Datalabs Agency | Victoria |
| Dataline ​Networks Pty Ltd | Victoria |
| Datalink Internet Systems Pty Ltd | Victoria |
| Datalust | |
| Datamine | |
| 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 | |
| Dawpro Solutions Pty Ltd | |
| Day3 Solutions Pty Ltd | Victoria |
| DB Engineers | Western Australia |
| DB Gurus Pty Ltd | New South Wales |
| DB Results | Victoria |
| DBCom | New South Wales |
| DBG Technologies | South Australia |
| DCS Australia Pty Ltd | Victoria |
| DDLS | New South Wales |
| Deakin College | |
| Deakin University | Victoria |
| Dealer I.T. | Victoria |
| Decade Technology | |
| Decant Digital | South Australia |
| Deciphr | Victoria |
| Decision, Inc. | New South Wales |
| Deeligence | |
| deepC | |
| Deepend | New South Wales |
| DeeperLook Web Design Pty Ltd | |
| Defencebyte Pty Ltd | New South Wales |
| Defyn | |