| HAINS | High Accuracy Inertial Navigation System | - | Atmospheric Research Center |
| HALOE | Halogen Occultation Experiment | - | Atmospheric Research Center |
| HAO | High Altitude Observatory | - | Atmospheric Research Center |
| HB | Horizontal Branch | - | Atmospheric Research Center |
| HCI | Highes Communications | - | Atmospheric Research Center |
| HCMM | Heat Capacity Mapping Mission | - | Atmospheric Research Center |
| HD | Henry Draper Catalog Entry | - | Atmospheric Research Center |
| HDE | Henry Draper Extension | - | Atmospheric Research Center |
| HDM | Hot Dark Matter | - | Atmospheric Research Center |
| HEAO | High Energy Astronomical Observatory | - | Atmospheric Research Center |
| HERA | Hermes Robotic Arm | - | Atmospheric Research Center |
| HF | High Frequency | - | Atmospheric Research Center |
| HGA | High Gain Antenna | - | Atmospheric Research Center |
| HH | Hitchhiker | - | Atmospheric Research Center |
| HIRDLS | High Resolution Dynamics Limb Sounder | - | Atmospheric Research Center |
| HIRIS | High Resolution Imaging Spectrometer | - | Atmospheric Research Center |
| HIRS | High Resolution Infrared Radiation Sounder | - | Atmospheric Research Center |
| HJD | Helicentric Julian Date | - | Atmospheric Research Center |
| HLC | Heavy Lift Capability | - | Atmospheric Research Center |
| HLV | Heavy Lift Vehicle | - | Atmospheric Research Center |
| HMC | Halley Multicolor Camera | - | Atmospheric Research Center |
| HOTOL | HOrizontal TakeOff And Landing | - | Atmospheric Research Center |
| HPFTP | High Pressure Fuel Turbopump | - | Atmospheric Research Center |
| HPOTP | High Pressure Oxidizer Turbopump | - | Atmospheric Research Center |
| HR | Hertzsprung-Russell | - | Atmospheric Research Center |
| HRDI | High Resolution Doppler Imager | - | Atmospheric Research Center |
| HRI | High Resolution Imager | - | Atmospheric Research Center |
| HRMS | High Resolution Microwave Survey | - | Atmospheric Research Center |
| HRPT | High Resolution Picture Transmission | - | Atmospheric Research Center |
| HRSC | High Resolution Stereo Camera | - | Atmospheric Research Center |
| HRSI | High-temperature Reusable Surface Insulation | - | Atmospheric Research Center |
| HRSR | High-Resolution Scanning Radiometer | - | Atmospheric Research Center |
| HSP | High Speed Photometer | - | Atmospheric Research Center |
| HST | Hubble Space Telescope | - | Atmospheric Research Center |
| HTHL | Horizontal Takeoff Horizontal Landing | - | Atmospheric Research Center |
| HTVL | Horizontal Takeoff Vertical Landing | - | Atmospheric Research Center |
| HUT | Hopkins Ultraviolet Telescope | - | Atmospheric Research Center |
| HV | High Voltage | - | Atmospheric Research Center |
