- Cosimo III, Grand-Duke of Tuscany, 1642-17231
- Costapellegrina, Giovan Andrea1
- Cottricciaio, Mariotto1
- Council of Vienne1
- Covoni, Luigi de1
- Cresci, Mariotto1
- Crespo, Johannes1
- Cristofano, Filippo di1
- Cristoforo, Pietro di1
- Criticism, Textual1
- Criticism, interpretation, etc.1
- Croatia--Šibenik1
- Cryptography1
- Cueva y de Castilla, Beltrán III de la, Duke of Alburquerque, -16121
- Cueva, Andrea della1
- Customary law1
- Customs administration1
- Cynics (Greek philosophy)1
- Dal Borgo family1
- Dati, Agostino, 1420-14781