- HABITER - EA 2076
- Hacettepe University = Hacettepe Üniversitesi
- Halfmoon Biosciences
- Halpin Wildlife Research
- Harvard University
- Háskóli Íslands [Reykjavik, Iceland]
- Hatfield Marine Science Center [Newport, USA]
- Hawai'i Institute of Marine Biology
- Hawk Mountain Sanctuary [Pennsylvania]
- HawkWatch International [USA]
- Hebei University
- Hellenic Centre for Marine Research
- Helmholtz Centre for Ocean Research [Kiel]
- Helmholtz-Gemeinschaft = Helmholtz Association
- Helmholtz Zentrum für Umweltforschung = Helmholtz Centre for Environmental Research
- Helsingin yliopisto = Helsingfors universitet = University of Helsinki
- Helsinki Institute of Life Science
- Hémostase & thrombose
- Herbier de Nouvelle-Calédonie
- Herdwangen-Schönach
- High North Research Centre for Climate and the Environment
- Hokkaido University [Sapporo, Japan]
- Holar University College
- Hong Kong University of Science and Technology
- Hôpital Bretonneau
- Hôpital de Hautepierre [Strasbourg]
- Hôpital Edouard Herriot [CHU - HCL]
- Hôpital universitaire Robert Debré [Reims]
- Hopkins Marine Station [Stanford]
- Horticultural Research Group
- Hospices Civils de Lyon
- Hospices Civils de Lyon, Lyon, France
- HT Harvey and Associated
- H.T. Harvey and Associates Ecological Consultants [USA]
- H.T. Harvey & Associates
- H.T. Harvey & Associates [CA, USA)
- H.T. Harvey & Associates Ecological Consultants [USA]
- Hudelson Consulting [Canada]
- Humboldt State University
- Humboldt-Universität zu Berlin = Humboldt University of Berlin = Université Humboldt de Berlin
- Hungarian Academy of Sciences
- Hungarian Natural History Museum (Magyar Természettudományi Múzeum)