- Catholic University of Rennes DEQARINST0951 FR0065 Institut catholique de Rennes Bruz (France)
- Catholic University of Portugal DEQARINST2139 PT0041 Universidade Católica Portuguesa Lisboa (Portugal)
- Catholic University of Lyon DEQARINST1040 FR0156 Institut catholique de Lyon Lyon (France)
- Catholic University of Eichstätt-Ingolstadt DEQARINST0333 DE0019 Katholische Universität Eichstätt-Ingolstadt (KU) Eichstätt (Germany)
- Catholic University of Avila, Faculty of Social and Legal Sciences DEQARINST5591 Facultad de Ciencias Sociales y Jurídicas Ávila (Spain)
- Catholic University of Avila, Faculty of Sciences and Arts DEQARINST5590 Facultad de Ciencias y Artes Ávila (Spain)
- Catholic University of Avila, Faculty of Health Sciences DEQARINST9442 Facultad de Ciencias de la Salud Ávila (Spain)
- Catholic University of Avila DEQARINST0824 ES0054 Universidad Católica Santa Teresa de Jesús de Ávila Ávila (Spain)
- Catholic University of Applied Sciences Freiburg DEQARINST0515 DE0220 Katholische Hochschule Freiburg i.Br. Freiburg im Breisgau (Germany)
- Catholic University in Ružomberok DEQARINST2387 SK0005 Katolická Univerzita v Ružomberku Ružomerok (Slovakia)
- Catholic University for Applied Sciences Berlin DEQARINST0552 DE0263 Katholische Hochschule für Sozialwesen Berlin (FH) Berlin (Germany)
- Catholic University College Vives Zuid (Hogeschool VIVES) DEQARINST0127 BE0080 Katholieke Hogeschool Vives Zuid Kortrijk (Belgium (Flemish Community))
- Catholic University College Vives Noord (Hogeschool VIVES) DEQARINST0123 BE0074 Katholieke Hogeschool Vives Noord Brugge (Belgium (Flemish Community))
- Catholic Private University Linz DEQARINST0023 AT0023 Katholische Privatuniversität Linz Linz (Austria)
- Catholic Institute of Higher Studies DEQARINST1121 FR0237 Institut catholique d'études supérieures La Roche-sur-Yon (France)
- Catholic Academy in Warsaw DEQARINST1918 PL0817 Akademia Katolicka w Warszawie Warszawa (Poland)
- Caspian Public University DEQARINST3171 Каспий қоғамдық университеті Kazakhstan
- Casimir Pulaski Radom University DEQARINST1931 PL0142 Uniwersytet Radomski im. Kazimierza Pułaskiego Radom (Poland)
- Casa College DEQARINST0231 CY0016 Nicosia (Cyprus)
- Carlos III University of Madrid, Higher Polytechnic School DEQARINST5434 Escuela Politécnica Superior Spain