| Acronym | Meaning |
 | HALIFF | N/A |
| HALOE | Halogen Occultation Experiment |
| HANK | N/A |
| HAO | High Altitude Observatory |
| HAPEX | Hydrological Atmospheric Pilot Experiment |
| HARP | Hawaiian Rainband Project |
| HARS | High-Altitude Route Structure Workstation |
| HARVARD | Harvard/Smithsonian Center For Astrophysics |
| HB | Hard Black |
| HBCUS | Historically Black Colleges And Universities |
| HCN | Historical Climatology Network |
| HCSN | High-Capacity Satellite Network |
| HDF | Hierarchical Data Format |
| HDGCP | Human Dimensions Of Global Change Program |
| HDGEC | Human Dimension Of Global Environment Change |
| HDLC | High Level Data Link Control |
| HDS | High-resolution Data Service |
| HEAO | High Energy Astronomy Observatory |
| HEIFE | Heihe Basin Field Experiment |
| HELLO | N/A |
| HEOS | Highly Eccentric Orbit Satellite |
| HEOS-A2 | Highly Eccentric Orbit Satellite |
| HERS | Human Ecology Research Service |
| HESP | High-Energy Solar Physics |
| HESS | Health |
| HEW | Health |
| HF | High Frequency |
| HF | High Frequency |
| HI | Human Interface |
| HIAPER | High-Performance Instrumented Airborne Platform For Environmental Research |
| HIGH-SLIP | Or High Slip |
| HIMSS | High Resolution Microwave Spectrometer Sounder |
| HIPLEX | High Plains Experiment |
| HIPPI | High Performance Parallel Interface |
| HIRDLS | High-Resolution Dynamics Limb Sounder |
| HIRIS | High Resolution Imaging Spectrometer |
| HIRRLS | High Resolution Research Limb Sounder |
| HIRS | High Infrared Radiometer (or Radiation) Sounder |
| HIRS | High-resolution Infrared Radiation Sounder |
| HIS | High-resolution Interferometer Sounder |
| HIS | High-resolution Infrared Sounder |
| HKUST | Hong Kong University Of Science And Technology |
| HL | Half Life |
| HMES | Hough Mode Extensions |
| HMMR | High Resolution Multifrequency Microwave Radiometer |
| HMS | High-altitude Multispectral Sounder |
| HMS | Hungarian Meteorological Service |
| HOL | Higher Order Language |
| HOS | Hydrocarbon Oxidation Studies |
| HP | Hewlett-Packard |
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