| Abbreviation | Definition |
|---|---|
| HOS | Head Of School |
| HOS | High Order Software |
| HOSC | Huntsville Operations Support Center |
| HOT | Hypertension Optimal Treatment |
| HOTOL | HOrizontal TakeOff And Landing |
| HOTS | Hypercalcemia-osteolysis-T-cell Syndrome |
| HOW | Honest Openness And Willingness |
| HP | Himachal Pradesh |
| HP | Harmonic Progression |
| HP | Horse Power |
| HP | hire purchase |
| HP | Horse Power |
| HP | High Precision |
| HP | Half Precision |
| HP | Hemipelvectomy |
| HP | Headache Prone |
| HP | Hypothalamic- Pituitary- Adrenal (axis) |
| HP | Perigee Altitude |
| HP | Hydrogen Purge |
| HP | High Pressure |
| HP | Hewlett Packard |
| HP | Handling Procedure |
| HP | Hepatic Porphyria |
| HPA | High Performance Addressing |
| HPA | Humeroscapular Periarthritis |
| HPAE | Human Pulmonary Arterial Endothelial |
| HPAS | Hypothalamic Pituitary Adrenocortical System |
| HPAS | High Performance Adhesive System |
| HPBF | Hepatotrophic Portal Blood Factor |
| HPBL | Human Peripheral Blood Leukocyte |
| HPC | High - Performance Computing |
| HPC | Heterotrophic Plate Count |
| HPCC | High Performance Computing and Communications |
| HPCL | Hindustan Petroleum Corporation Limited |
| HPD | Hot Plug Detect |
| HPD | Highest Posterior Density |
| HPD | Hearing Protection Device |
| HPE | History and Physical Examination |
| HPET | High Precision Event Timer |
| HPF | High Power Field |
| HPF | Horizontal Processing Facility |
| HPF | Hepatic Plasma Flow |
| HPFC | Hire Purchase Financing Company |
| HPFD | High Pressure Fuel Duct |
| HPFTP | High Pressure Fuel Turbopump |
| HPG | Hypothalamic-Pituitary-Gonadal Axis |
| HPG | High Pressure Gas |
| HPGS | High Pressure Gas System |
| HPI | History of Present Illness |
| HPI | High Performance Indicator |