- Correspondence71
- Correspondence (Cyprian, Saint, Bishop of Carthage)1
- Correspondence (Namık Kemal)1
- Corró de Munt (Spain)1
- Corsini, Bartolomeo1
- Corsino, Pietro di1
- 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
- Cosmography23
- Cosmology9
- Cosmology, Ancient2
- Cosmology, Medieval1
- Cost1
- Costa, Gaspar, active 1533-15341