| Absolutely Group Pty Ltd | Victoria |
| ABTC Group | New South Wales |
| Abtrac | New South Wales |
| Abyss Solutions | New South Wales |
| AC&E Telecommunications | New South Wales |
| ACAC Innovation | Queensland |
| Acacia Business Systems | New South Wales |
| Academies Australasia Polytechnic | |
| Academy IT | South Australia |
| Academy of Interactive Technology Pty Ltd | |
| Academy Xi | |
| ACAP University College | |
| Acce Communications | Victoria |
| Accel IT | |
| Accelerate IT Solutions | |
| Acceleration | Victoria |
| Accentuate | Queensland |
| Access Data Systems | New South Wales |
| Access Internet | Western Australia |
| Acclaim Accounting Software Pty Ltd | Queensland |
| Accounting Addons | South Australia |
| Ace Internet Services Pty Ltd | New South Wales |
| Ace Web Design Adelaide | South Australia |
| Achyut Labs | |
| Acidgreen | New South Wales |
| ACJ Creative | |
| ACK IT Services Pty Ltd | New South Wales |
| Acknowledge Education Pty Ltd | |
| Acorn | |
| Acquire BPO Pty Ltd | |
| acQuire Technology Solutions Pty Ltd | |
| Across Technology | Victoria |
| Acrotec Pty Ltd | New South Wales |
| Acrux | Victoria |
| ACS Distance Education | Queensland |
| ACS Distance Education - Information Technology Courses | Queensland |
| ACSIS Technologies | |
| ACT Apple Users Group | Australian Capital Territory |
| ACT Education and Training Pty Ltd | Western Australia |
| ACT Government Open Data Portal | Australian Capital Territory |
| Act Today | New South Wales |
| ACTEK Business Solutions | |
| Acterys | |
| Actinogen Medical | New South Wales |
| Action Websites | Victoria |
| Activa Pty Ltd | New South Wales |
| ActivePipe Group Pty Ltd | Victoria |
| Actual Size | Victoria |
| Actualise Design | |
| Actuator Digital Pty Ltd | |