- Calvin
- Calvin
- Campbell
- Capadocians Fathers
- Cardinal Cajetan
- Cassian
- Catherine of Aragon
- Caxton
- Cerularius
- Charlemagne
- Charles Martel
- Charles V
- Chaucer
- Clement I
- Clement of Alexandria
- Clement of Rome
- Clement V
- Clement VII
- Clement VIII
- Clovis
- Cohen
- Constans
- Constantine
- Copernicus
- Cortes
- Cranmer
- Cromwell
- Cromwell
- Cyprian
- Cyril
- Cyril of Thessalonica
Note: Ancient and medieval figures, as well as popes, are typically listed by first name. For ancient theologians, where exact dates of birth and death are often unknown, “c.” (Latin for circa) means “approximately” and “fl.” (for “flourished”) refers to the period at which time this person was known to be active.