- CAS Institute of Oceanology
- Center for Atmospheric and Oceanic Studies [Sendai]
- Center for Marine and Environmental Research “Ruðer Bošković” Institute
- CentraleSupélec
- Centre d'Ecologie marine expérimentale
- Centre de Physique des Particules de Marseille
- Centre d'études d'océanographie et de biologie marine
- Centre d'océanologie de Marseille
- Centre for Ecological Research
- Centre for Environment, Fisheries and Aquaculture Science [Lowestoft]
- Centre for Marine Science, School of Biological Sciences, University of Queensland
- Centre Hospitalier Régional Universitaire [CHU Lille]
- Centre Hospitalier Régional Universitaire de Nancy
- Centre Interdisciplinaire de Nanoscience de Marseille
- Centre National de la Recherche Scientifique
- Centre National d'Études Spatiales [Toulouse]
- Centro de estudios e investigaciones laborales [Buenos Aires]
- Centro de Geofisica de Évora = Centre of Geophysics of Evora
- Cheju National University
- Chimie Atmosphérique Expérimentale
- China Academy of Chinese Medical Sciences
- China Jiliang University
- Chinese Academy of Geological Sciences [Beijing]
- Chinese Academy of Sciences
- Chinese Academy of Sciences [Beijing]
- Chinese Academy of Sciences [Changchun Branch]
- Chinese Academy of Sciences [Qingdao]
- Chinese Academy of Sciences [Wuhan Branch]
- City University of Hong Kong [Hong Kong]
- College of Atmospheric Sciences [Lanzhou]
- College of Environmental Sciences and Engineering [Peking]
- College of Fisheries and Life Science
- College of Marine Life Science, Ocean University of China
- College of Marine Life Sciences [Ocean University of China]
- College of Marine Life Sciences [Qingdao]
- College of Marine Science [St Petersburg, FL]
- College of Oceanic and Atmospheric Sciences [Corvallis]
- College of William and Mary [Williamsburg]
- Commissariat à l'énergie atomique et aux énergies alternatives
- Commonwealth Scientific and Industrial Research Organisation [Australia]
- Commonwealth Scientific and Industrial Research Organisation Energy Technology
- Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires]
- Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain]
- Cooperative Institute for Research in Environmental Sciences
- Cyanobactéries des milieux aquatiques tropicaux peu profonds. Rôles et contrôles
- Cytometry Laboratories and School of Veterinary Medicine