| Abbreviation | Definition |
|---|---|
| AGS | Americans for Gun Safety Foundation |
| AGSG | Applied Geography Specialty Group |
| AGU | American Geophysical Union |
| AHA | American Historical Association |
| AHA | American Humane Association |
| AHA | American Humanist Association |
| AHA | Americans Helping Americans |
| AHA | Association of Hispanic Arts |
| AHA-USA | Action Against Hunger - United States of America |
| AHCA | American Health Care Association |
| AHE | Association for Human Emergence |
| AHEAD | Adventures in Health, Education, and Agricultural Development |
| AHF | American Hospice Foundation |
| AHF | Army Historical Foundation |
| AHHA | American Holistic Health Association |
| AHHC | Angela Hospice Home Care |
| AHHC | Association for Home and Hospice Care |
| AHHCI | Angela Hospice Home Care, Inc. |
| AHIC | A Helper In Christ |
| AHIMA | American Health Information Management Association |