| Abbreviation | Definition |
|---|---|
| HBOI-AD | Harbor Branch Oceanographic Institution - Aquaculture Division |
| HCA | Head of Contracting Activity |
| HCBP | Hexachlorobiphenyl |
| HCFC | Hydrochlorofluorocarbon |
| HCO | Head of Contracting Office |
| HDA | Hail Detection Algorithm |
| HDF | Hierarchical Data Format |
| HDGECP | Human Dimensions of Global Environmental Change Program |
| HEW | Health, Education and Welfare |
| HFC | HydroFluoroCarbon |
| HGA | High Grown Atlantic |
| HHWLT | Higher High Water, Large Tide (water elevation level) |
| HIBU | Hydrological Institute and Belgrade University |
| HIF | Horizontal Integral Float |
| HIFT | Heard Island Feasibility Test |
| HIMB | Hawai'i Institute of Marine Biology |
| HIP | Highly Improvised Performance |
| HIRIS | High-resolution Imaging Spectrometer |
| HIRS | High-resolution Infrared Sounder |
| HIRT | Hurricane Intercept Research Team |