| Abbreviation | Definition |
|---|---|
| AYMN | Australian Youth Mentoring Network |
| AYN | Aboriginal Youth Network |
| AYOF | Australian Youth Olympic Festival |
| AZA | Australian Zoroaster Association |
| BA | Brilliant Aussie |
| BACR | Boeing Australia Component Repairs |
| BACWA | Banning And Censoring Wowser Agenda |
| BAEP | Bennelong Australian Equity Partners |
| BAMOS | Bulletin of the Australian Meteorological and Oceanographic Society |
| BANA | British, Australasian, and North American |
| BAPA | Birds Australia Parrot Association |
| BARA | Board of Airline Representatives of Australia |
| BATA | British American Tobacco Australia |
| BATAS | British American Tobacco Australia Services |
| BAWA | Badminton Association of Western Australia |
| BAWA | Bridge Association of Western Australia |
| BBFA | Berean Bible Fellowship of Australia |
| BBFANSW | Bed & Breakfast and Farm-stay Association of New South Wales (Australia) |
| BCNA | Breast Cancer Network Australia |
| BCSA | Bible College of South Australia |