| Abbreviation | Definition |
|---|---|
| ABN | Australian Business Number?? |
| ABN | Australian Business Numbers |
| ABNA | Australian Biospecimen Network Association |
| Abo | an Australian Aborigine, Aboriginal, koori |
| ABO | Australian Beach Outdoor |
| ABRR | Australian Business Rescue and Repair |
| ABRS | Australian Biological Resources Study |
| ABS | Australian Bureau of Statistics |
| ABSA | Australian Bird Study Association |
| ABSA | Australian Boarding Schools Association |
| ABSA | Australian Building Sustainability Association |
| ABSF | Australian Bicentennial Scholarships and Fellowships |
| ABSF | Australian Blind Sports Federation |
| ABUD | Australian Built Urban Designs |
| ABW | Australian Business Week |
| ABWI | Australasian Bottled Water Institute |
| ABWI | Australia Business Week in India |
| AC | Australian Curriculum |
| AC | Companion of the Order of Australia |
| ACA | Australian Cricketers Association |