| 2BC | To be continued. | |
| AAAB | Asian American Advisory Board | |
| AAAB | Accounting Alumni Advisory Board | |
| AAAC | Affirmative Action Advisory Committee | |
| AAAC | AI in Advancement Advisory Council | |
| AAB | Associates Advisory Board | |
| AABS | Assurance and Advisory Business Services | |
| AAC | Administrative Advisory Committee | |
| AAC | Aging Advisory Council | |
| AAC | Aquaculture Advisory Council | |
| AACSCEDR | Associate and Advisory Committee to the Special Committee on Electronic Data Retrieval | |
| AACTI | Apex Advisory Council for Telecom in India | |
| AAG | Accreditation Advisory Group | |
| ABAB | Administrative Burdens Advisory Board | |
| ABAB | Administrative Burden Advisory Board | |
| ABAB | Australasian BIM Advisory Board | |
| ABAC | American Bioethics Advisory Commission | |
| ABAS | Assurance Business Advisory Services | |
| ABBF | Advisory Board for Banking Frauds | |
| ABCAB | Amgen Bioprocessing Center Advisory Board | |
| ABCAN | Advisory Board on Child Abuse and Neglect | |
| ABCC | Advisory Board on Compensation Claims | |
| ABDI | Advisory Board for Defence Information | |
| ABDM | Advisory Board On Disarmament Matters | |
| ABLM | Advisory Body on Legal Matters | |
