Former Owner
- Carlo Archinto, 2nd Marquess of Parona, 3rd Count of Trainate1
- Carlo Francesco Frasconi1
- Carlos José Gutiérrez de los Ríos y Rohan Chabot Fernán-Núñez1
- Casey Albert Wood1
- Caspar René Gregory1
- Castel-Lodève family1
- Catharine Wisser1
- Catherina van Drenckwaert1
- Catherine de' Medici1
- Cecil Deedes1
- Cecil Dunn Gardner1
- Cecil Mallaby Firth1
- Chacère Family1
- Champmol1
- Chapelle du monastère du Carmel de Nantes1
- Charles Archibald Stonehill1
- Charles B. Hoyt1
- Charles Brodrick1
- Charles Busnel1
- Charles Deane1