| Abbreviation | Definition |
|---|---|
| HCSD | Hillsborough County School District |
| HCSD | Hilton Central School District |
| HCSD | Hilton Central School District's |
| HCSD | Humboldt County School District |
| HCSI | Highline Creative Schools Initiative |
| HCSS | Hancock County School System |
| HCSS | Holy Cross Secondary School |
| HCSS | Hyde County School System |
| HCST | Hudson County Schools of Technology |
| HDES | Hall Dale Elementary School |
| HDES | Hillsboro Deering Elementary School |
| HDES | Hornsby Dunlap Elementary School |
| HDES | Hugh Dingess Elementary School |
| HDES | Huntington Drive Elementary School |
| HDHS | Haribhai Deokaran High School |
| HDHS | Harrow District High School |
| HDHS | Harwich and Dovercourt High School |
| HDHS | Hiwassee Dam High School |
| HDMS | Hillsboro Deering Middle School |
| HDSB | Halton District School Board |