- HE Space Operations BV for ESA|ESTEC
- HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université
- Hadley Centre for Climate Prediction and Research
- Hanoi Institute of Geophysics
- Hanscom Air Force Base
- Harpeth Hall School
- Harvard University
- Harvard-Smithsonian Center for Astrophysics
- Helmholtz zentrum für Schwerionenforschung GmbH
- Helmholtz-Zentrum Geesthacht
- High Altitude Observatory
- Huazhong University of Science and Technology [Wuhan]
- Hughes Aircraft Company