- Hadley Centre for Climate Prediction and Research
- Hanoi Institute of Geophysics
- Hanscom Air Force Base
- Harpeth Hall School
- Harvard-Smithsonian Center for Astrophysics
- Harvard University
- Helmholtz zentrum für Schwerionenforschung GmbH
- Helmholtz-Zentrum Geesthacht
- HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université
- HE Space Operations BV for ESA|ESTEC
- High Altitude Observatory
- Hôpital de la Timone [CHU - APHM]
- Hôpital Henri Mondor
- Huazhong University of Science and Technology [Wuhan]
- Hughes Aircraft Company
- Hughes Research Laboratories
- Hungarian Academy of Sciences
- Hydrologie
- Hydrologie-Hydraulique
- Hydrology Laboratory [Beltsville]
- Hydroscience and Engineering [Iowa City]
- Hydrosciences Montpellier
- Hydrosystèmes et Bioprocédés