| Abbreviation | Definition |
|---|---|
| ATNF | Australia Telescope National Facility |
| ATO | Australian Tax Office |
| ATO | Australian Taxation Office |
| ATO | Australian Transport Office |
| ATOA | Australia Telescope Online Archive |
| ATOD | Australian Teachers of Dancing |
| ATOD | Australian Theatre of the Deaf |
| ATOS | Australian Treatment Outcome Study |
| ATPI | Australian Technology Park Innovations |
| ATPR | Australian Trade Practices Reporter |
| ATPR | Australian Trade Practices Reports |
| ATSA | Accountants Technology Showcase Australia |
| ATSB | Australian Transport Safety Bureau |
| ATSI | Aboriginal And Torres Strait Islander |
| ATSI | Aboriginal And Torres Straits Islander |
| ATSIP | Australian Tropical Sciences and Innovation Precinct |
| ATSO | Australian Technical Standard Order |
| ATSO | Australian Technical Standard Orders |
| ATTA | Australian Time Trials Association |
| ATTC | Australian Trade Training College |