- Catholic Church. Archdiocese of Lyon (France)1
- Catholic Church. Archdiocese of Mexico City (Mexico)1
- Catholic Church. Archdiocese of Oaxaca (Mexico)1
- Catholic Church. Archdiocese of Siena (Italy)5
- Catholic Church. Archdiocese of Wrocław (Poland)1
- Catholic Church. Cancellaria Apostolica4
- Catholic Church. Diocese of Pistoia (Italy)3
- Catholic Church. Diocese of Sigüenza-Guadalajara (Spain)1
- Catholic Church. Province of Santiago de Compostela (Spain)1
- Catholics1
- Catiline, approximately 108 B.C.-62 B.C.3
- Caucasus1
- Cavalcanti, Aldobrandino, 1217-12791
- Cavallero, Diego1
- Cecchi, Giovannino1
- Cecco, Antonio1
- Cecco, Nato di1
- Cecco, d'Ascoli, 1269-13271
- Ceccoli, Baldo1
- Ceccoli, Bartolo1