Former Owner
- Buxheim Charterhouse1
- Carleton Rubira Richmond1
- Carlo Archinto, 2nd Marquess of Parona, 3rd Count of Trainate1
- Carlo Bonaparte1
- Carlo Morbio1
- Cecil Deedes1
- Charles Alexander de Cosson1
- Charles Archibald Stonehill1
- Charles B. Hoyt1
- Charles Burr1
- Charles Fairfax Murray1
- Charles Joseph Harford1
- Charles William Dyson Perrins1
- Chiaravalle della Colomba Abbey1
- Christiania Kathedralskoles Bibliothek1
- Cini Johan de Barisani1
- Claude Augustin de Cosson1
- Clement XI1
- Compagnia della Purificazione di Maria e di San Zanobi1
- Compagnia della Vergine Maria (Cento, Italy)1