| Abbreviation | Definition |
|---|---|
| HLCA | High Level Clearance Authority |
| HLCG | High Level Contact Group for Drug Control |
| HLS | HomeLand Security |
| HLSA | HomeLand Security Act |
| HLSS | Household Living Standard Servey |
| HMI | Hazardously Misleading Information |
| HMIS | Homeless Management Information System |
| HMO | Health Maintenance Organisation |
| HMO | House of Multiple Occupants |
| HMSE | Hazard Mitigation and Structural Engineering |
| HNAG | Household Non-AGriculture |
| HNS | Hazardous And Noxious Substances |
| HNT | Hostage Negotiation Team |
| HOA | Hearing On Assets |
| HOB | House Office Building |
| HOC | House Oversight Committee |
| HOEPA | Home Ownership and Equity Protection Act of 1994 |
| HOH | Head Of Household |
| HOH | Heard On the Hill |
| HOHCFC | Heart Of Ohio Combined Federal Campaign |