- Cortesi, Girolamo1
- Cortigiani, Giovanni1
- Corvus3
- Cosimo I, Grand-Duke of Tuscany, 1519-15747
- Cosimo II, Grand Duke of Tuscany, 1590-16211
- Cosimo III, Grand-Duke of Tuscany, 1642-17231
- Cosmetics--Moral and ethical aspects1
- Cosmochronology1
- Cosmography24
- Cosmology10
- Cosmology, Ancient2
- Cosmology, Medieval1
- Cost1
- Costa, Gaspar, active 1533-15341
- Costapellegrina, Giovan Andrea1
- Costume2
- Costume--Kamakura-Momoyama periods1
- Coton, Pierre, 1564-16261
- Cotton trade1
- Cottricciaio, Mariotto1