| NHSA | National Head Start Association 
| Others |
| NHSA | National Healthcare Security Administration
| Others |
| NHSA | National Healthcare Staffing Association
| Others |
| NHSA | National Healthy Start Association
| Others |
| NHSA | National Hellenic Student Association
| Others |
| NHSA | National High School Association
| Others |
| NHSA | National Highway Safety Administration
| Others |
| NHSA | National Homeland Security Association
| Others |
| NHSA | National Human Services Assembly
| Others |
| NHSA | National Hunting and Shooting Association
| Others |
| NHSA | New Hampshire Snowmobile Association
| Others |
| NHSA | New Hampshire Soccer Association
| Others |
| NHSA | New Hampshire Storytelling Alliance
| Others |
| NHSA | New Hampshire Swim Association
| Others |
| NHSA | North Hudson Sewerage Authority
| Others |
| NHSA | Northern Health Science Alliance
| Others |
| NHSA | Nursing Health Systems Administration
| Others |