| High Resolution Spectrometer | Academic & Science |
| House Rabbit Society | Academic & Science |
| Heart Rhythm Society | Academic & Science |
| Habitat Restoration Sciences | Academic & Science |
| Harrismith | Airport Code |
| Harris Corporation of Delaware | Business |
| Hudson Resources Ltd | Business |
| Horses Allowed | Business |
| High Risk Security | Business |
| High Reliability Schools | Community |
| Holland Residential Services | Community |
| Hotel Reservations Service | Community |
| Hotel Reservation System | Community |
| Holy Redeemer School | Community |
| Hair Replacement Systems | Computing |
| High Resolution System | Computing |
| Recruitment software | Computing |
| Holographic Readout System | Electronics |
| Heat Rejection System | General |
| Hydrogen Refueling Station | General |
| Human Resources Solutions | General |
| Human Relations Service | General |
| Human Resource Specialist | General |
| Helmholtz Resonator Speaker | General |
| Hankook Runflat System | General |
| Hdb Record Status | General |
| Helmet Removal System | General |
| Hassle Roust Steal | General |
| Hours of Service | General |
| Hot Roddicus Supersonicus | General |
| Headrest | General |
| Hyundai Rally Series | General |
| Hot Rolled Steel | General |
| Heated Rear Seats | General |
| Hydro Reacting Steering | General |
| Hagelands Rallysport Team | General |
| Honda Research and Development Southeast Asia | General |
| High Roof Sleeper | General |
| Hawaii Revised Statutes | General |
| Harness Release System | General |
| Human Resource System | General |
| Human Resources Survey | General |
| Harmonic Resolution Systems | General |
| High Resolution Spectrograph | General |
| Heel Retention System | General |
| Higher Replica Sector | General |
| Human Resources Services | General |
| Human Resource Systems | General |
| Human Resource Services | General |
| Hellenic Register of Shipping | General |
| Human Resources Specialists | General |
| Hair Restoration Specialists | General |
| Heavy Rocket System | General |
| Hazard Ranking System | General |
| Highest Reasonable Score | General |
| Heat Recovery Solutions | General |
| Human Rights Service | General |
| Human Resources Specialist | General |
| Household Responsibility System | General |
| Hermes Repository Services | General |
| Human Recreational Services | General |
| Human Review System | General |
| Handgun Reflex Sight | General |
| Harry R Schwartz | General |
| HATHRAS JN | Indian Railway Station |
| Hotel Reservation Service | Internet |
| Help Recover Storage | Internet |
| hepatorenal syndrome | Medical |
| Health and Retirement Study | Medical |
| Health Recovery Services | Medical |
| Health Resource Services | Medical |
| Health Resource Solutions | Medical |
| Health Recovery Solutions | Medical |
| Harm Reduction Services | Medical |
| Haw River Syndrome | Medical |
| Health Rehabilitative Services | Medical |
| High- Resolution Scenarios | Military and Defence |
| Horizon Reference System | Military and Defence |
| Holidaysburg and Roaring Spring Railroad Company | Regional |
| Hollidaysburg and Roaring Spring Railroad | Regional |
| Hamburger Rail Service | Regional |
| Hathras Junction | Transport & Travel |
