NHAA
| 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 |