| Abbreviation | Definition |
|---|---|
| HJHS | Hook Junior High School |
| HJPS | Hertsmere Jewish Primary School (Borehamwood, Hertfordshire, UK) |
| HJS | Henleaze Junior School |
| HKIS | Hong Kong International School |
| HKJS | Hong Kong Japanese School |
| HKMS | Haddam Killingworth Middle School |
| HKMS | Helen Keller Middle School |
| HKS | Harvard Kennedy School |
| HKSC | Hong Kong School of Commerce |
| HKSS | Hong Kong Sea School |
| HLBC | Haller Lake Baptist Church |
| HLCS | Hadley Luzerne Central School |
| HLCS | Houghton Lake Community Schools |
| HLHS | Hunters Lane High School |
| HLMS | Horn Lake Middle School |
| HLPS | High Level Public School |
| HLS | Harvard Law School's |
| HLSA | Harvard Law School Alumni |
| HLSS | Heart Lake Secondary School |
| HMHS | Haddonfield Memorial High School |