Former Owner
- C.J. Spence1
- Caesareum Societatis Jesu Collegium Viennense1
- Cambrai Cathedral1
- Cambron Abbey1
- Camillo Riccio1
- Carl Alphons Geigy-Hagenbach1
- Carl Frederick Haussmann1
- Carl Reinhardt4
- Carleton Rubira Richmond1
- Carlo Archinto, 2nd Marquess of Parona, 3rd Count of Trainate3
- Carlo Francesco Frasconi1
- Carlo Morbio7
- Carlos José Gutiérrez de los Ríos y Rohan Chabot Fernán-Núñez1
- Casey Albert Wood1
- Caspar René Gregory1
- Castel-Lodève family1
- Castelluci1
- Catharine Wisser1
- Catherina van Drenckwaert1
- Catherine de' Medici1