- Hafok AB
- Hakai Institute
- Hamburg University of Applied Sciences [Hamburg]
- 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-Gemeinschaft = Helmholtz Association