Former Owner
- C.B1
- Caesareum Societatis Jesu Collegium Viennense1
- Camillo Riccio1
- Carleton Rubira Richmond1
- Carlo Archinto, 2nd Marquess of Parona, 3rd Count of Trainate3
- Carlo Bonaparte1
- Carlo Francesco Frasconi1
- Carlo Morbio1
- Castelluci1
- Catharine Wisser1
- Catherina van Drenckwaert1
- Caxton Club1
- Cecil Brent1
- Cecil Deedes1
- Cecil H. Clough1
- Chacère Family1
- Chapelle du monastère du Carmel de Nantes1
- Charles Augustus Stoddard1
- Charles B. Hoyt1
- Charles Brodrick1