| Abbreviation | Definition |
|---|---|
| HHS | Helena High School |
| HHS | Hemlock High School |
| HHS | Henderson Handicapped School |
| HHS | Hendersonville High School |
| HHS | Heritage High School |
| HHS | Highland High School |
| HHS | Hillsdale High School |
| HHS | Holgate High School |
| HHS | Homestead High School |
| HHSC | Hamilton Heights School Corporation |
| HHSC | Healthy High School Challenge |
| HHSD | Haddon Heights School District |
| HHSD | Hasbrouck Heights School District |
| HHSD | Hatboro Horsham School District |
| HHSD | Hendrick Hudson School District |
| HIBA | High School Born-Againers |
| HIBS | Highlands International Boarding School |
| HIBS | Honduras Independence Bilingual School |
| HIBS | Hutt International Boys' School |
| HIMS | Hamilton International Middle School |