- CNR Istituto di Scienza e Tecnologie dell’Informazione “A. Faedo” [Pisa]
- Cap Gemini [Amsterdam]
- Carleton University
- Centre National de la Recherche Scientifique
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement
- Centre for Quantum Computation and Intelligent Systems &, School of Software
- Centrum Wiskunde & Informatica
- Centrum voor Wiskunde en Informatica
- Chennai Mathematical Institute [Inde]
- Chinese Academy of Sciences [Beijing]
- Chinese Academy of Sciences [Changchun Branch]
- Christian-Albrechts-Universität zu Kiel = Christian-Albrechts University of Kiel = Université Christian-Albrechts de Kiel
- Cluster of Excellence Multimodal Computing and Interaction
- Computing Science Department
- Concurrency, Mobility and Transactions
- Czech Academy of Sciences [Prague]