| Abbreviation | Definition |
|---|---|
| HSCA | House Select Committee on Assassinations |
| HSEC | Homeland Security Executive Committee |
| HSESC | Human Subjects Ethics Sub committee |
| HSIC | Heads of State Implementation Committee |
| HSPIC | Human Services Partnership Implementation Committee |
| HSRC | Historic Sites Review Committee |
| HSRC | Human Subjects Review Committee |
| HSSC | Hydrographic Services and Standards Committee |
| HSTC | Hawaii State Training Committee |
| HTC | House Transportation Committee |
| HTOC | Halons Technical Options Committee |
| HTOC | Helicopter Tour Operators Committee |
| HTOC | Human Tissue Oversight Committee |
| HUAC | HOUSE Unamerican Activities Committee |
| HVEC | Human Values Ethics Committee |
| HVEC | Huron Valley Equestrian Committee |
| HVNC | HGVS Variant Nomenclature Committee |
| HWC | Health Work Committees |
| IACC | Interagency Air Cartographic Committee |
| IACUC | Ional Animal Care and Use Committee |