| I Hate My PC | Tasmania |
| I-Nex Corporation | South Australia |
| I-Tech | New South Wales |
| I.T. Basecamp | New South Wales |
| I.W.S. Internet Web Solutions | Victoria |
| i2i Logic (Australia) Pty Ltd | Victoria |
| i4U | Queensland |
| IA Design | South Australia |
| IAMJAMES | |
| iBase Solutions | New South Wales |
| IBC Digital | Western Australia |
| IBISWorld | Victoria |
| iBoss | New South Wales |
| iBusiness Formula | |
| ICA Solutions | New South Wales |
| ICDB Sydney Branch | |
| Icelab | |
| iCetana Pty Ltd | Western Australia |
| Icom Australia Pty Ltd | Victoria |
| iComply Pty Ltd | Victoria |
| Icon Digital | |
| ICON Technologies | Western Australia |
| ICP GLOBAL Pty Ltd | New South Wales |
| iCreate Agency | |
| ID Digital Agency | |
| Idea Box Pty Ltd | Victoria |
| Ideagen Lucidity | |
| Idealpos Solutions | Queensland |
| IDEAQU | |
| Identitii Ltd | New South Wales |
| IDG Communications Pty Ltd | New South Wales |
| IDP Solutions Pty Ltd | New South Wales |
| IDrive | New South Wales |
| Idronic | Queensland |
| IDT Australia | Victoria |
| iExperts | New South Wales |
| If You Build It | New South Wales |
| iFactory Pty Ltd | Queensland |
| iFLYflat Pty Ltd | |
| iFour Technolab Pty Ltd | |
| Ignite Creative | New South Wales |
| Ignite Digital Solutions (Australia) Pty Ltd | |
| Ignite Search | |
| Ignition Creative | Queensland |
| Ignition Media | Queensland |
| Ignition Wealth Ltd | New South Wales |
| IGSME | |
| iiNet Ltd | Western Australia |
| Illume Marketing | |
| Illuminate Systems | New South Wales |