| Abbreviation | Definition |
|---|---|
| HASA | High Altitude Southern Appalachian |
| HASAP | High-Altitude Stereo Aerial Photograph |
| HCS | Hummocky Cross Stratification |
| HD | High Desert |
| HDD | Horizontal Directional Drilling |
| HDR | Hot Dry Rock |
| HEC | Hydrologic Engineering Center |
| HELP | Hydrologic Evaluation of Landfill Performance |
| HFL | High Flood Level |
| HI | Hotspot Implementation |
| HIG | Hawaii Institute of Geophysics |
| HIK | Hikone, Japan, Seismograph Station code |
| HIL | Hilo, Hawaii, Seismograph Station code |
| HIPP | Himalayan Interdisciplinary Paleoclimate Project |
| HMSZ | Hyde-Macraes Shear Zone |
| HOMS | Hydrological Operational Multipurpose System |
| HP | Highest Point |
| HPAA | High Plains Applied Anthropologist |
| HPT | Hydraulic Profiling Tool |
| HPT | Hydrocarbon Process Technology |