| Abbreviation | Definition |
|---|---|
| APSR | Asian Pacific Society of Respirology |
| APSS | Asian Pacific Student Services |
| APT | Asian Poker Tour |
| APTM | Asian Premium Travel Mart |
| APTTA | Australasian Piano Tuners and Technicians Association |
| ARD | Agricultural research for development |
| AREZ | Amateur Radio Emergency Services |
| ARF | Asian Rowing Federation |
| ARFU | Asian Rugby Football Union |
| ARGM | Asian rice gall midge |
| ARS | Asian Regional Section |
| ARSN | Asian Rotavirus Surveillance Network |
| ASAA | Asian Studies Association of Australia |
| ASALA | Armenian Secret Army for the Liberation of Armenia |
| ASBM | Asian School of Business Management |
| ASCEND | Asian Social Culture Empowerment Networking Development |
| ASCI | Asian Society of Cardiovascular Imaging |
| ASCM | Asian Society of Conservation Medicine |
| ASCM | Asian Symposium on Computer Mathematics |
| ASDC | Asian Schools Debating Championship |