Former Owner
- Brick Row Book Shop1
- Bruce P. Ferrini1
- Burndy Library2
- Byron Reed1
- C. Bruscoli1
- C.J. Spence1
- Camilla Doria Pallavicini1
- Camillo Riccio1
- Carl Hermann Grabauer1
- Carlo Archinto, 2nd Marquess of Parona, 3rd Count of Trainate1
- Carlo Francesco Frasconi1
- Carlo Morbio1
- Castelluci1
- Cecil H. Clough1
- Certosa di Farneta, Province of Lucca2
- Charles Butler2
- Charles Carmichael Lacaita1
- Charles Edward Harris-St. John1
- Charles Eliot Norton11
- Charles F. Gunther1