| Acronym | Definition |
|---|
| NHAA➣National Herbalists Association of Australia (est. 1920) |
| NHAA➣National Hampton Alumni Association (Hampton University; Hampton, VA) |
| NHAA➣National Hydrogen Association of Australia |
| NHAA➣New Hampshire Area Assembly of Alcoholics Anonymous, Inc. |
| NHAA➣New Hampshire Adjusters Association (professional insurance group) |
| NHAA➣New Hampshire Aquaculture Association |