| Abbreviation | Definition |
|---|---|
| HSDA | Hawaii School of Dental Arts |
| HSDA | High School Democrats of America |
| HSDB | Hawaii School for the Deaf and the Blind |
| HSDC | High School Dual Credit |
| HSDM | Hawaii School Digital Media |
| HSDM | Hawaii Schools Digital Media |
| HSDO | High School Diploma Option |
| HSDO | High School District Organization |
| HSDO | High School Drop Out |
| HSDP | High School Diploma Program |
| HSE | Harmony School of Excellence |
| HSE | High School Equivalency |
| HSE | Higher School of Economics |
| HSEA | High School Early Acceptance |
| HSEA | High School Early Admit |
| HSEA | High School Equivalency Assessment |
| HSEA | Home School Enrichment Academy |
| HSEAS | Harvard School of Engineering and Applied Sciences (Harvard University; Cambridge, MA) |
| HSEC | High School Engineering Competition |
| HSEC | High School Equivalency Certificate |