| Hydrometeorological Prediction Center | Academic & Science |
| Hydrological Processes and Climate | Academic & Science |
| Heterotrophic Plate Count (microbiology) | Academic & Science |
| High-Performance Coaching | Business |
| Hearth Products Controls | Business |
| High Performance Computer | Business |
| Hercules, Inc. | Business |
| High Productive Cutting | Business |
| High Performance Coating | Business |
| Hosting Provider Company | Business |
| Hydraulic Press Channel | Community |
| High Performance Culture | Community |
| Hyde Park Cafe | Community |
| The Human Preservation Council | Community |
| Healing Place Church | Community |
| Highland Park Continuation | Community |
| High Probability of Completion | Computer and Networking |
| High Productivity Computing | Computing |
| Highly Painful Computer | Computing |
| Hot Plug Controller | Computing |
| Handheld Pc | Computing |
| Home Personal Computer | Computing |
| Highly Predictable Clusters | Computing |
| Heat Pipe Conduit | Computing |
| Hasty Pudding Cipher | Computing |
| Highly Parallel Computing | Computing |
| Handheld Personal Computer | Computing |
| High Pin Count | General |
| Heterotrophic Plate Count | General |
| High Precision Calibration | General |
| Heavy Passenger Car | General |
| High Pressure Cutoff | General |
| Harold Pike Construction | General |
| High Performance Course | General |
| Hairpin Corner | General |
| High Performance Concept | General |
| Hummer Parts Club | General |
| High Performance Car | General |
| High Pressure Chamber | General |
| Heavy Paraffin Conversion | General |
| High Performance Caterham | General |
| High Power Charger | General |
| Highway Patrol Car | General |
| Honda Performance Club | General |
| Hanggar Peugeot Community | General |
| Head Performance Criterion | General |
| Highway Pilot Connect | General |
| High Performance Club | General |
| Historical Piano Collection | General |
| High Performance Chromatography | General |
| High Performance Cow | General |
| High-Performance Cocktail | General |
| Hefler Performance Coaching | General |
| Hearth Products | General |
| High Pressure Compatible | General |
| Habitación propia compartida | General |
| High Performance Concrete | General |
| High Performance Cluster | General |
| Hate Priscilla Crew | General |
| High Pressure Compressor | General |
| Haskell program coverage | General |
| Hole Position Coefficient | General |
| High Performance Connection | General |
| High Performance Centre | General |
| High Performance Copper | General |
| Hematopoietic Progenitor Cells | Governmental |
| Human Progenitor Cell | Governmental |
| Health Policy Commission [Massachusetts] | Governmental |
| Police Head Constable | Indian Police Rank |
| High-Performance Computing | Information Technology |
| Hayat Pharma Canada | Medical |
| History of Presenting Complaint | Medical |
| Hemangiopericytoma | Medical |
| Hematopoietic progenitor cell | Medical |
| hypopharyngeal carcinoma | Medical |
| hydrogenated phosphatidylcholine | Medical |
| Health Professions Council | Medical |
| Healthcare Purchasing Consortium | Medical |
| Health Policy Commission | Medical |
| Homemaker Personal Carer | Medical |
| Health Care Professional | Medical |
| History of Present Complaint | Medical |
| Head Phone Clique | Messaging |
| Hindustan Paper Corporation Limited | Miniratna Central Public Sector Enterprise |
