| American Association of Applied Psychology | Academic & Science |
| Amino Acid Auxin Permease | Academic & Science |
| Alumni Admissions Ambassador Program | Academic & Science |
| Associate of The Association of Accountancy Practitioners | Accounts and Finance |
| Art Agency And Production | Business |
| American Academy of Addiction Psychiatry | Business |
| American Association of Avian Pathologists | Business |
| American Association of Applied Psychologists | Community |
| Association for the Advancement of AcuEnergetics® Practitioners | Community |
| American Association for Applied Psychology | Community |
| Alberta Association of Aquatic Professionals | Community |
| Amateur Astronomers Association of Pittsburgh | Community |
| Amateur Astronomers Association of Princeton | Community |
| Arizona Association of Activity Professionals | Community |
| Association of Administrators in Academic Pediatrics | Community |
| Asociación de Atletismo del Alto Paraná | General |
| Automated Advanced Acquisition Platform | General |
| Aortic Aneurysm Antigenic Proteins | General |
| As Accurate As Possible | General |
| Australasian Association of Animal Production | General |
| Analytics and AI Accelerate Program | General |
| Asociaci de Atletismo del Alto Paran·The full form of AAAP is about the meaning of AAAP abbreviation in the Miscellaneous field in general and in the Unclassified in particular. | General |
| Automated Advanced Acquisition Program | General |
| Adult Archery Achievement Program | General |
| Auckland Action Against Poverty | General |
| Atheists & Agnostics Alliance Pakistan | Governmental |
| Alliance for Arizona Animal Protection | Governmental |
| Atheist Agnostic Alliance Pakistan | Governmental |
| Atheist and Agnostics Alliance Pakistan | Governmental |
| Alabama Autism Assistance Program | Medical |
| Africa Adaptation Acceleration Program | Regional |