Former Owner
- Carlo Francesco Frasconi1
- Carlo Morbio1
- Cecil Deedes1
- Charles Alexander de Cosson1
- Charles Allen Munn1
- Charles Archibald Stonehill1
- Charles B. Hoyt1
- Charles Joseph Harford1
- Charles Sauvageot1
- Charles William Dyson Perrins1
- Chiaravalle della Colomba Abbey1
- Christiania Kathedralskoles Bibliothek1
- Cini Johan de Barisani1
- Clarence Howard Clark, Sr.1
- Clarence S. Bement1
- Claude Augustin de Cosson1
- Clement XI1
- Clemente Carilli1
- Coluccio Salutati1
- Compagnia della Vergine Maria (Cento, Italy)1