| Abbreviation | Definition |
|---|---|
| ATALA | Australian Travel Association for Latin |
| ATALA | Australian Travel Association for Latin America |
| ATAR | Australia Tertiary Admission Rank |
| ATAR | Australian Teritary Admission Rank |
| ATAR | Australian Tertiary Admission Rank |
| ATAR | Australian Tertiary Admissions Rank |
| ATAR | Australian Total Arrogance Rank |
| ATBC | Australia Taiwan Business Council |
| ATC | Australian Telecommunications Corporation |
| ATC | Australian Transport Council |
| ATCA | Australia Telescope Compact Array |
| ATCC | Australian Touring Car Championship |
| ATCCC | Australia Telugu Community and Cultural Centre |
| ATCSA | Australian Terrier Club of South Australia |
| ATD | Australia Travel Declaration |
| ATDF | Australian Tap Dance Festival |
| ATDN | Australian Tissue Donation Network |
| ATDS | Australian Total Diet Survey |
| ATDW | Australian Tourism Data Warehouse |
| ATE | Australian Tourism Exchange |