| Abbreviation | Definition |
|---|---|
| AA | Arakan Army |
| ABC | A Bunch of Communists |
| ABCD | Another Bad China Day |
| ABNJ | Areas Beyond National Jurisdiction |
| ABRS | Area-Based Return Support |
| ABS | Access and Benefit Sharing |
| ABS | Air Breathing System |
| AC | Armed Constabulary |
| ACBC | African Capacity Building Centre |
| ACC | Administrative Committee on Coordination |
| ACHR | Asian Coalition for Housing Rights |
| ACO | Allied Command Operations |
| ACT | Access to COVID-19 Tools |
| ACT | Artemisinin-based combination therapies |
| ACTA | Access to COVID-19 Tools Accelerator |
| ADB | Asian Development Bank |
| ADO | Administrative Duty Officer |
| AFEJ | Asian Forum of Environmental Journalists |
| AFICS | Association of Former International Civil Servants |
| AFP | Agency of Funds and Programmes |