| Abbreviation | Definition |
|---|---|
| NHMS | Nathan Hale Middle School |
| NHMS | New Heights Middle School |
| NHMS | Niguel Hills Middle School |
| NHMS | North Hall Middle School |
| NHPS | New Haven public schools |
| NHS | National High School |
| NHS | Navarre High School |
| NHS | Nederland High School |
| NHS | Neverland High School |
| NHS | Newington High School |
| NHS | Newport High School |
| NHS | Newtown High School |
| NHS | Nimitz High School |
| NHS | North High School |
| NHS | Northeast High School |
| NHS | Northville High School |
| NHSCA | National High School Coaches Association |
| NHSS | Nangkor Higher Secondary School |
| NHSTA | Nebraska High School Theatre Awards |
| NIBS | Network of International Business Schools |