- CA-MI S.r.l.
- CERN [Genève]
- Cardiff University
- Carleton University
- CentraleSupélec
- Centre National de la Recherche Scientifique
- Centre for Interactive Systems Research
- Chebyshev Laboratory
- Christian Doppler Laboratory for Security and Quality Improvement and Quality Improvement in the Production System Lifecycle
- City University of London
- College of Engineering and Science [Louisiana]
- College of Mathematics, Physics and Information Engineering [Jinhua]
- Colombian Center of Excellence and Appropriation on Big Data and Data Analytics
- Commonwealth Scientific and Industrial Research Organisation [Australia]
- Computer Science [Louisiana]
- Council for Scientific and Industrial Research [Pretoria]
- Council for Scientific and Industrial Research [South Africa]
- Coventry University