| Homological Algebra Programming | Academic & Science |
| Long Island | Airport Code |
| Hamster Alliance Productions | Business |
| Human Advertising Project | Business |
| Highly-Automated Process | Business |
| Horizons AlphaPro Income Plus Fund | Business |
| High Age Profile | Chemistry |
| Holographic Assistance Program | Chemistry |
| Handicapped Adoption And Poverty | Community |
| Homework Accountability Program | Community |
| Home After Program | Community |
| Hyper-accelerated Protean | Community |
| Humanities Arts Performance | Community |
| High Attaining Pupils | Community |
| Health Administration Press | Community |
| Hold And Protect | Computing |
| Host Access Protocol | Computing |
| High Availability Package | Computing |
| Horizontal Attack Profile | Computing |
| Hybrid Access Point | Computing |
| Compressed File Archive (hap) | File Type |
| Herbalife Advantage Program | General |
| Huntsville Assistance Program | General |
| Hexing Accidental Petz | General |
| Help A Person | General |
| Homeless Advocacy Project | General |
| Homeless Advocacy | General |
| Humanitarian Accountability Partnership | General |
| HomeKit Accessory Protocol | General |
| Homebuyer Assistance Program | General |
| Happy Adoptive Parent | General |
| Higher Achievement Program | General |
| Hague Appeal for Peace | General |
| Homeless Assistance Program | General |
| Homeless Action Partnership | General |
| Homeownership Assistance Program | General |
| Handicap Are Producers | General |
| Html Asp Php | General |
| Hydrometeorological Applications Program | General |
| Hazardous Air Pollutants | General |
| Hitachi Automotive Products | General |
| Hapville Assembly Plant | General |
| Handicap Accessible Parking | General |
| Honda Accord Passion | General |
| Hyundai Access Point | General |
| The Hind And The Panther | General |
| Hmong American Partnership | General |
| Homeowners Assistance Program | General |
| Home Away Pattern | General |
| Houston Achievement Place | General |
| Hourly Analysis Program | General |
| Heating Assistance Program | General |
| Hardware Assisted Paging | General |
| Hoosier Assurance Plan | General |
| Hazardous Air Pollutant | Governmental |
| Health And Progress | Medical |
| Hospital Accreditation Program | Medical |
| Hospital Accreditation Programme | Medical |
| Hospital-acquired pneumonia | Medical |
| Healthcare Administrative Partners | Medical |
| Human Anatomy and Physiology | Medical |
| Health Alliance Plan | Medical |
| Hospital Association of Pennsylvania | Medical |
| HIV AIDS Prevention | Medical |
| Humanitarian Assistance Program | Military and Defence |
| High Altitude Prototype | Military and Defence |
| Housing Assistance Payment | Real Estate |
| Housing Assistance Program | Real Estate |
| Housing Assistance Payments | Real Estate |
| Healthy Alaskans Program | Regional |
| Heure Avancée du Pacifique | Regional |
| Heure Avanc? du Pacifique | Regional |
| Long Island, Queensland, Australia | Regional |
| Hardware Allocation Panel | Space Science |
| Heuristic Astronomy Project | Space Science |
| High-altitude Platform | Space Science |
| Hunting Access Program | Sports |