| Abbreviation | Definition |
|---|---|
| HSED | High School Equivalency Diploma |
| HSED | High School Equivilancy Diploma |
| HSEE | High School Equivalency Exam |
| HSEE | High School Equivalency Examination |
| HSEE | High School Exit Exam |
| HSEF | High School of Economics and Finance |
| HSEF | Hillsborough School Employees Federation |
| HSEI | High School Engineering Immersion |
| HSEI | High School Engineering Institute |
| HSEL | Harrow School Enterprises Limited |
| HSEL | Harrow School Enterprises Ltd |
| HSEL | High School Esports LeagueHome |
| HSEP | High School Equivalency Preparation |
| HSEP | High School Equivalency Program |
| HSEP | High School Exploration Program |
| HSEP | High School Extension Program |
| HSEPP | High School Equivalency Preparation Program |
| HSES | Hartford Sumner Elementary School |
| HSES | Heath Springs Elementary School |
| HSES | High School for Environmental Studies |