| Abbreviation | Definition |
|---|---|
| HSIN | Homeland Security Information Network |
| HSL | Hardware Systems Laboratory |
| HSMN | Homeland Security Management |
| HSNI | Homeland Security for Networked Industries |
| HSO | Health and Safety Officer |
| HSOC | Hispanic Statement Of Cooperation |
| HSR | Hart-Scott-Rodino |
| HSSEDI | Homeland Security Systems Engineering and Development Institute |
| HST | Harry S. Truman Scholarship Foundation |
| HTA | Hell To Abolish |
| HTH | Happy To Help |
| HTHC | Hand To Hand Combat |
| HUA | Heard, Understood, and Acknowledged |
| HUAC | House Un-American Activities Committee |
| HUB | Historically Underutilized Businesses |
| HUD | Department of Housing and Urban Development |
| HUD | Housing and Urban Development |
| HV | Handicapped Veteran |
| HVAC | House Veterans' Affairs Committee |
| HW | Hrsc Waoss |