| Abbreviation | Definition |
|---|---|
| AOMS | Australian Outback Medical Services |
| AONA | Australian Ophthalmic Nurses Association |
| AONA | Australian Orthopaedic Nurses' Association |
| AONM | Australian Obligated Nuclear Material |
| AOOP | Australian Ocean Observing Partnership |
| AOPC | Australian Offshore Powerboat Club |
| AOQ | Australian Organisation for Quality |
| AOR | Australian Off Road |
| AORA | Australian Oil Recyclers Association |
| AORA | Australian Organics Recycling Association |
| AORC | Australian Off Road Championship |
| AORS | Australian Ocean Racing Series |
| AOSM | Australian Operational Service Medal |
| AOTC | Australian And Overseas Telecommunications Corporation |
| AOVC | Australian Old Vine Collection |
| AOYF | Australian Olympic Youth Festival |
| AP | Australian Parents |
| APA | Aborigines Progressive Association |
| APAC | Australia Pacific Airports Corporation |
| APAC | Australian Partnership For Advanced Computing |