- Hadley Centre for Climate Prediction and Research
- HafenCity University
- Hainan University
- Halmos College of Natural Sciences and Oceanography
- Hanyang University
- Harbin Institute of Technology
- Harbor Branch Oceanographic Institute [Fort Pierce]
- Harry Oppenheimer Okavango Research Centre
- Harvard John A. Paulson School of Engineering and Applied Sciences
- Harvard University
- Hatfield Marine Science Center [Newport, USA]
- Hawai'i Institute of Marine Biology
- Hawaii Pacific University
- Health Department, Direction of Health and Social Affairs of New Caledonia
- Hebei Normal University
- Heilongjiang Institute of Science and Technology
- Hélium : du fondamental aux applications
- Hellenic Centre for Marine Research
- Helmholtz Centre for Ocean Research [Kiel]
- Helmholtz-Gemeinschaft = Helmholtz Association
- Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg
- Helmholtz-Institut Mainz
- Helmholtz zentrum für Schwerionenforschung GmbH
- Helmholtz Zentrum für Umweltforschung = Helmholtz Centre for Environmental Research
- Helmholtz-Zentrum Geesthacht
- Helmholtz-Zentrum Hereon
- Helsingin yliopisto = Helsingfors universitet = University of Helsinki
- Helsinki Institute of Sustainability Science
- Herbário do Lubango
- Herbarium et Bibliothèque de Botanique africaine
- Herbier National du Cameroun
- Heriot-Watt University [Edinburgh]
- HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université
- Hessisches Landesamt für Naturschutz, Umwelt und Geologie
- High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC)
- Hisashi Nakamura Laboratory
- Histoire naturelle de l'Homme préhistorique
- Hitotsubashi University
- HMCI
- Hochschule Mannheim - University of Applied Sciences
- Hohai University
- Hokkaido Information University
- Hokkaido University of Science
- Hokkaido University [Sapporo, Japan]
- Hong Kong University of Science and Technology
- Hôpital Cimiez [Nice]
- Hopkins Marine Station [Stanford]
- Horn Point Laboratory
- Hospices Civils de Lyon
- HT Harvey and Associated
- H.T. Harvey & Associates
- H.T. Harvey & Associates [CA, USA)
- Huazhong Agricultural University [Wuhan]
- Huazhong University of Science and Technology [Wuhan]
- Humboldt State University
- Humboldt-Universität zu Berlin = Humboldt University of Berlin = Université Humboldt de Berlin
- Humbolt State University
- Hungarian Academy of Sciences
- HYBIS
- Hydrobiologie
- Hydrologic Research Center
- Hydrologie-Hydraulique
- Hydrometeorological Service [Georgetown]
- Hydroptic
- Hydrosciences Montpellier
- Hydrosystèmes et Bioprocédés
- HYGEOS (SARL)
- HZ University of Applied Sciences