| H | Henry | - | Business and Finance |
| H | Hecto | - | Business and Finance |
| H/W | Hardware | - | Business and Finance |
| HAC | Heads And Chairs | - | Business and Finance |
| HADS | Hydrometeorological Automated Data System | - | Business and Finance |
| HAILSWATH | South Dakota Hail Studies | - | Business and Finance |
| HALIFF | N/A | - | Business and Finance |
| HALOE | Halogen Occultation Experiment | - | Business and Finance |
| HANK | N/A | - | Business and Finance |
| HAO | High Altitude Observatory | - | Business and Finance |
| HAPEX | Hydrological Atmospheric Pilot Experiment | - | Business and Finance |
| HARP | Hawaiian Rainband Project | - | Business and Finance |
| HARS | High-Altitude Route Structure Workstation | - | Business and Finance |
| HARVARD | Harvard/Smithsonian Center For Astrophysics | - | Business and Finance |
| HB | Hard Black | - | Business and Finance |
| HBCUS | Historically Black Colleges And Universities | - | Business and Finance |
| HCN | Historical Climatology Network | - | Business and Finance |
| HCSN | High-Capacity Satellite Network | - | Business and Finance |
| HDF | Hierarchical Data Format | - | Business and Finance |
| HDGCP | Human Dimensions Of Global Change Program | - | Business and Finance |
| HDGEC | Human Dimension Of Global Environment Change | - | Business and Finance |
| HDLC | High Level Data Link Control | - | Business and Finance |
| HDS | High-resolution Data Service | - | Business and Finance |
| HEAO | High Energy Astronomy Observatory | - | Business and Finance |
| HEIFE | Heihe Basin Field Experiment | - | Business and Finance |
| HELLO | N/A | - | Business and Finance |
| HEOS | Highly Eccentric Orbit Satellite | - | Business and Finance |
| HEOS-A2 | Highly Eccentric Orbit Satellite | - | Business and Finance |
| HERS | Human Ecology Research Service | - | Business and Finance |
| HESP | High-Energy Solar Physics | - | Business and Finance |
| HESS | Health | - | Business and Finance |
| HEW | Health | - | Business and Finance |
| HF | High Frequency | - | Business and Finance |
| HF | High Frequency | - | Business and Finance |
| HI | Human Interface | - | Business and Finance |
| HIAPER | High-Performance Instrumented Airborne Platform For Environmental Research | - | Business and Finance |
| HIGH-SLIP | Or High Slip | - | Business and Finance |
| HIMSS | High Resolution Microwave Spectrometer Sounder | - | Business and Finance |
| HIPLEX | High Plains Experiment | - | Business and Finance |
| HIPPI | High Performance Parallel Interface | - | Business and Finance |
| HIRDLS | High-Resolution Dynamics Limb Sounder | - | Business and Finance |
| HIRIS | High Resolution Imaging Spectrometer | - | Business and Finance |
| HIRRLS | High Resolution Research Limb Sounder | - | Business and Finance |
| HIRS | High Infrared Radiometer (or Radiation) Sounder | - | Business and Finance |
| HIRS | High-resolution Infrared Radiation Sounder | - | Business and Finance |
| HIS | High-resolution Interferometer Sounder | - | Business and Finance |
| HIS | High-resolution Infrared Sounder | - | Business and Finance |
| HKUST | Hong Kong University Of Science And Technology | - | Business and Finance |
| HL | Half Life | - | Business and Finance |
| HMES | Hough Mode Extensions | - | Business and Finance |
| HMMR | High Resolution Multifrequency Microwave Radiometer | - | Business and Finance |
| HMS | High-altitude Multispectral Sounder | - | Business and Finance |
| HMS | Hungarian Meteorological Service | - | Business and Finance |
| HOL | Higher Order Language | - | Business and Finance |
| HOS | Hydrocarbon Oxidation Studies | - | Business and Finance |
| HP | Hewlett-Packard | - | Business and Finance |
| HP | Horse Power | - | Business and Finance |
| HPA | High Power Amplifier | - | Business and Finance |
| HPCC | High-performance Computing And Communications | - | Business and Finance |
| HPCS | High-performance Computing Section | - | Business and Finance |
| HPD | Hourly Precipitation Data | - | Business and Finance |
| HPO | High Performance Option | - | Business and Finance |
| HPPI | High Performance Parallel Interface | - | Business and Finance |
| HPS | High Performance Systems | - | Business and Finance |
| HR | Human Resources | - | Business and Finance |
| HRD | Hurricane Research Division | - | Business and Finance |
| HRDI | High Resolution Doppler Imager | - | Business and Finance |
| HRDI | High Resolution Doppler Interferometer | - | Business and Finance |
| HRDL | High-resolution Doppler Lidar | - | Business and Finance |
| HRIR | High-resolution Infrared Radiometer | - | Business and Finance |
| HRIS | High-Resolution Infrared Radiation Sounder | - | Business and Finance |
| HRM | High Rate Multiplexer | - | Business and Finance |
| HRPT | High Resolution Picture Transmission | - | Business and Finance |
| HRS | High-resolution Data Service | - | Business and Finance |
| HRS | Hardwae Requirements Specification | - | Business and Finance |
| HRSO | High Resolution Solar Observatory | - | Business and Finance |
| HRSR | High Resolution Scanning Radiometer | - | Business and Finance |
| HRT | High Rate Tape | - | Business and Finance |
| HRTS | High-resolution Telescope Spectrograph | - | Business and Finance |
| HRV | High-resolution Visible | - | Business and Finance |
| HS | High Speed | - | Business and Finance |
| HSC | High Speed Channel | - | Business and Finance |
| HSCT | High Speed Civil Transport | - | Business and Finance |
| HSI | High-speed Interferometer | - | Business and Finance |
| HSM | Hierarchical Storage Management | - | Business and Finance |
| HSMT | Helical Scan Magnetic Tape | - | Business and Finance |
| HSRP | High Speed Research Program | - | Business and Finance |
| HST | Hubble Space Telescope | - | Business and Finance |
| HTML | Hypertext Mark-up Language | - | Business and Finance |
| HTO | Tritiated Water | - | Business and Finance |
| HTTP | Hypertext Transfer Protocol | - | Business and Finance |
| HVPS | High-volume Precipitation Spectrometer | - | Business and Finance |
| HWCI | Hardware Configuration Item | - | Business and Finance |
| HYPERCHANNNEL | High-speed Communications Link | - | Business and Finance |
