Administrative
| Acronym | Full Form |
| ADMIN- | Administration, Administrative |
| ADMIN- | ASEAN Disaster Management Information Network |
| AAA- | Autonomous Administrative Authority |
| AAHK | Airport Authority Hong Kong |
| AAI |
Airports Authority of India |
| AAIA | Air Accident Investigation Authority |
| AALA | Adventurous Activities Licensing Authority |
| AAOCC | Authority Accuracy Objectivity Currency and Coverage |
| AATA | Arizona Automobile Theft Authority |
| AATT | Airports Authority of Trinidad and Tobago |
| ABCD | Authority Bias Coverage And Date |
| ABEI | Authority of Broadcasting and Electronic Information |
| ABIM | American Board of Internal Medicine |
| ABO | Authorities Budget Office |
| ABRS | Authority of British Riding Schools |
| ADEWA |
Abu Dhabi Electricity and Water Authority |
| ADRA | Addictive Disorder Regulatory Authority |
| AEA |
Alaska Energy Authority |
| 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 |
| AHJ | Authority Having Jurisdiction |
| AHSP | Authority Holding Sealed Particulars |
| AIA | Authority Information Access |
| AIDEA | Alaska Industrial Development Export Authority |
| AMLA | Anti Money Laundering Authority |
| ANUM | Authority Need Urgency and Money |
| APM | Angkatan Pertahanan Awam Malaysia |