Former Owner
- Camilla Doria Pallavicini1
- Carl Alphons Geigy-Hagenbach1
- Carl Frederick Haussmann1
- Carl Reinhardt2
- Carlo Archinto, 2nd Marquess of Parona, 3rd Count of Trainate2
- Carlo Morbio5
- Carlton Lake2
- Castelluci1
- Catherine Conduitt1
- Cecil H. Clough1
- Charles Alexander de Cosson1
- Charles Augustus Stoddard1
- Charles Bruce, 3rd Earl of Ailesbury1
- Charles Butler1
- Charles Chardin1
- Charles Coffin Little1
- Charles D. Humberd1
- Charles Eliot Norton3
- Charles F. Gunther1
- Charles Fairfax Murray1