Former Owner
- Brayton C. Ives3
- Bruce P. Ferrini6
- C Traylen Bookshop1
- Catherine de' Medici1
- Caxton Club1
- Certosa di Farneta, Province of Lucca2
- Chapelle du monastère du Carmel de Nantes1
- Charles Butler1
- Charles Eliot Norton3
- Charles Kothen1
- Charles Lormier1
- Charles Sessler1
- Charles Sumner7
- Charles-Adrien Picard1
- Charles-Gilbert Morel de Vindé1
- Charlier de Namur1
- Chartreuse de Val-Saint-Esprit1
- Chasseigne family1
- Chiswick Book Shop1
- Christian Friedrich August Günther1