| 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 |