Affiliations with the Letter C
- Calgon Carbon Corporation -- United States
- California Institute of Technology -- United States
- CambridgeSoft Corporation -- United States
- Campus Universitario de Tarifa -- Spain
- Canada Colors and Chemicals, Ltd. -- Canada
- Canadian Food Inspection Agency -- Canada
- Canadian Plastics Industry Association -- Canada
- CanTox Health Sciences International -- Canada
- Cape Peninsula University of Technology -- South Africa
- Carnegie Mellon University -- United States
- Case Western Reserve University -- United States
- Cawthron Institute -- New Zealand
- CEA Saclay -- France
- Center for Macromolecular Science -- Poland
- Central Drug Research Institute -- India
- Central Salt and Marine Chemicals Research Institu -- India
- Central Science Laboratory -- United Kingdom
- Centralsygehuset i Naestved -- Denmark
- Centre d'Études du Bouchet -- France
- Centre d'Études Nucléaires -- France
- Centre de Biochimie Structurale -- France
- Centre de Recherches sur la Physique -- France
- Centre National d'Etudes Veterinaires et Alimentaires -- France
- Centre National de la Recherche Scientifique (CNRS) -- France
- Centro Comune di Ricerca, Scienze della Vita -- Italy
- Centro de Investigaciones Bioenergéticas -- Argentina
- Centro Nacional De Metrologia (CENAM) -- Mexico
- Cerex Agri, Inc. -- United States
- Ceská Zemedelská Univerzita -- Czech Republic
- Chalk River Laboratories/AECL -- Canada