Former Owner
- Carlo Longland1
- Carlo Morbio7
- Carlos José Gutiérrez de los Ríos y Rohan Chabot Fernán-Núñez1
- Carlton Lake2
- Cartwright, Janet1
- Casey Albert Wood1
- Caspar René Gregory2
- Castel-Lodève family1
- Castelluci1
- Catharine Wisser1
- Catherina van Drenckwaert1
- Catherine Barton1
- Catherine Conduitt3
- Catherine de' Medici1
- Cati S Thomas1
- Caxton Club1
- Cecil Brent1
- Cecil Deedes1
- Cecil Dunn Gardner1
- Cecil H. Clough1