NHSAA
| Acronym | Definition |
|---|---|
| NHSAA | New Hampshire School Administrators Association |
| NHSAA | Norwalk High School Alumni Association (Norwalk, CT) |
| NHSAA | Nacogdoches High School Alumni Association (Nacogdoches, TX) |
| NHSAA | National Horse Show Association of America Ltd. |
| NHSAA | National Heron Sailing Association of Australia |