- CA3, Uninova, Campus New University of Lisbon|FC
- CAS Software [Karlsruhe]
- CEDOC - Department of Rheumatology
- CEMOP
- CIDESI Texas
- CIEB-ISEL
- CPFL Energia
- CTS - Uninova
- CTS, UNINOVA – Campus FCT|UNL
- CTS-UNINOVA
- CTS|UNINOVA, Faculty of Sciences and Technology
- Center for Computacional and Stochastic Mathematics
- Center for GeoBioSciences, GeoTechnologies and GeoEngineering
- Center for Innovation in Electrical and Energy Engineering [Lisboa]
- Center of Electronics Optoelectronics and Telecommunications [Faro]
- Center of Technology and Systems
- Centre National de la Recherche Scientifique
- Centre de Développement des Technologies Avancées
- Centre for Energy and Environment Research
- Centre of Physics of the University of Minho
- Centre of Technology and Systems
- Centre of Technology and Systems, CTS, UNINOVA
- Centre of Technology and Systems, Faculdade de Ciências e Tecnologia
- Centro Algoritmi [Guimarães]
- Centro Nacional de Microelectronica [Spain]
- Centro de Electrónica, Optoelectrónica e Telecomunicações, Departamento de Física
- Centro de Estudos de Doenças Crónicas
- Centro de Física Nuclear da Universidade de Lisboa
- Centro de Informática e Tecnologia Informação
- Centro de Investigación de Gestión e Ingenieria de la Producción [Valencia]
- Centro de Investigación en Gestión e Ingeniería de Producción [Valencia]
- Centro de Investigação em Energia REN-State Grid, S. A.
- Chernihiv National University of Technology
- Chernihiv State Technological University
- Chronic Diseases Research Center
- Cie3 - Center for Innovation in Electrical and Energy Engineering
- Clausthal University of Technology
- Coburg University of Applied Sciences and Arts
- Complejo Hospitalario Universitario de Albacete
- Computational Intelligence Research Group
- Computer and Automation Research Institute [Budapest]
- Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain]
- Consiglio Nazionale delle Ricerche
- Cranfield University
- Critical Health [Coimbra]
- Câmara Municipal de Évora