| Abbreviation | Definition |
|---|---|
| HSLE | High School Lake Ecology |
| HSLI | High School Law Institute |
| HSLI | High School Leadership Initiative |
| HSLI | High School Leadership Institute |
| HSLI | High School of Language and Innovation |
| HSLJ | High School for Law and Justice |
| HSLS | High School Longitudinal Study |
| HSMA | High School Mid Atlantic |
| HSMP | High School for Medical Professions |
| HSMT | High School Mission Team |
| HSMT | High School Missions Team |
| HSMT | High School Mock Trial |
| HSNM | High School non Musical |
| HSO | High School Outreach |
| HSOB | High School Old Boys |
| HSOC | High School on Campus |
| HSOD | Hawthorne School Of Dance |
| HSOD | Hoylake School of Dance |
| HSOG | Hertie School of Governance |
| HSOG | High School of Glasgow |