| Abbreviation | Definition |
|---|---|
| ANTAG | United Nations Transition Assistance Group |
| AOSIS | Alliance Of Small Island developing States |
| AP2000 | United Nations Development Programme Asia-Pacific 2000 conference |
| APDC | Asia and Pacific Development Centre |
| APICM | Anti- Personnel Improved Conventional Munitions |
| APMEN | Asia Pacific Malaria Elimination Network |
| APOE | Aerospace Platform Of Earth |
| APTF | Asia Pacific Task Force |
| ARC | Action Reinhardt Camps |
| ARF | Asean Regional Forum |
| ARIA | A Road to Iranians Ability |
| ARISE | UNISDR Private Sector's Alliance for Disaster Resilient Societies |
| ARISE | UNISDR Private Sector's Alliance for Disaster Resilient Societies |
| ARMO | Aviation Risk Management Office |
| ARMY | Aren't Ready For Marines Yet |
| ART | Africa Resources Trust |
| ART | Anti-Retroviral Treatment |
| AS | Artillery Shelling |
| ASC | Area Security Coordinator |
| ASMT | Area Security Management Team |