| Abbreviation | Definition |
|---|---|
| AAMH | Association For Advancement Of Mental Health |
| AAMH | Australian Association for Maritime History |
| AAMIF | Aplastic Anemia and MDS International Foundation |
| AAMMP | Association of Air Medical Membership Programs |
| AAMP | Austin Art + Music Partnership |
| AAMS | Association of Air Medical Services |
| AAN | Adopt America Network |
| AAN | Allergy and Asthma Network |
| AAN | American Association of Nurserymen |
| AANE | Asperger / Autism Network |
| AANMA | Allergy and Asthma Network Mothers of Asthmatics |
| AAOC | Alzheimer's Association Of Orange County |
| AAOE | Association for African-Owned Enterprises |
| AAOF | American Association of Orthodontists Foundation |
| AAOF | Autism Association for Overseas Families |
| AAOM | Association of Acupuncture and Oriental Medicine |
| AAP | Abortion Access Project |
| AAP | Adopt A Pet |
| AAPA | American Association of Port Authorities |
| AAPA | Australian Aborigines Progressive Association |