- Hafok AB
- Hakai Institute
- Hamburg University of Applied Sciences [Hamburg]
- Harvard T.H. Chan School of Public Health
- Harvard University
- Hatherly Laboratories [Exeter]
- Haute Ecole du Paysage, d'Ingénierie et d'Architecture de Genève
- Hawai'i Institute of Marine Biology
- Helenic Centre for Marine Research
- Hellenic Centre for Marine Research
- Helmholtz Centre for Ocean Research [Kiel]
- Helmholtz-Gemeinschaft = Helmholtz Association
- Helmholtz-Zentrum Geesthacht
- Helmholtz-Zentrum Hereon
- Helsingin yliopisto = Helsingfors universitet = University of Helsinki
- Heriot-Watt University [Edinburgh]
- Hokkaido University [Sapporo, Japan]
- Hopkins Marine Station [Stanford]
- Horn Point Laboratory
- Human Computer Technology Laboratory
- HYDRECO
- Hydrosystèmes continentaux anthropisés : ressources, risques, restauration