Clan - Come
- Clandestinity
- Clandestinity (in Canon Law)
- Clare of Assisi, Saint
- Clare of Montefalco, Saint
- Clare of Rimini, Blessed
- Claret y Clará, Saint Antonio María
- Clark, William
- Classical Latin Literature in the Church
- Claude Allouez
- Claude Bernard
- Claude Bernard, French physiologist
- Claude Buffier
- Claude Chantelou
- Claude d'Espence
- Claude Dablon
- Claude de la Colombière, Saint
- Claude de Lorrain
- Claude de Sainctes
- Claude de Visdelou
- Claude Estiennot de la Serre
- Claude Ferdinand Gaillard
- Claude Frassen
- Claude Judde
- Claude Le Coz
- Claude Maltret
- Claude Perrault
- Claude-Adrien Nonnotte
- Claude-Francois Menestrier
- Claude-Francois-Dorothee de Jouffroy
- Claude-Frederic Bastiat
- Claude-Goefroi Coquart
- Claudia
- Claudianus Mamertus
- Claudio Monteverde
- Claudiopolis
- Claudiopolis (Bithynia)
- Claudius Acquaviva
- Claudius Clavus
- Claver, Saint Peter
- Clavigero, Francisco Saverio
