| Abbreviation | Definition |
|---|---|
| ACPA | Allegheny County Port Authority |
| ADEWA | Abu Dhabi Electricity and Water Authority |
| ADIA | Abu Dhabi Investment Authority |
| ADRA | Addictive Disorder Regulatory Authority |
| ADTA | Abu Dhabi Tourism Authority |
| AEMCO | Administrative Enhanced Movement Control Order| Perintah Kawalan Pergerakan Diperketatkan Secara Pen |
| AERA | Airport Economic Regulatory Authority |
| AFAB | Authority of the Freeport Area of Bataan |
| AFAC | Australasian Fire Authorities Council |
| AFDA | Administrative Functions Disposal Authority |
| AFE | authority for expenditure |
| AFLA | Association of Finnish Local Authorities |
| AFMA | Australian Fisheries Management Authority |
| AFSA | Astana Financial Services Authority |
| AFSA | Australian Financial Security Authority |
| AHJ | Authority having |
| AHJ | Authority Having Juridiction |
| AHJ | Authority Having Jurisdiction |
| AIA | Authority Information Access |
| AIDEA | Alaska Industrial Development and Export Authority |