Former Owner
- Catharine Wisser1
- Caxton Club1
- Cecil Deedes1
- Chapelle du monastère du Carmel de Nantes1
- Charles Bruce, 3rd Earl of Ailesbury1
- Charles Butler1
- Charles D. Humberd1
- Charles Hope, 3rd Marquess of Linlithgow1
- Charles Hurleston1
- Charles Marriette1
- Charles Stephen Ascherson1
- Christian Gottlieb Schwarz1
- Chrétien-François II de Lamoignon1
- Claude Joseph Constant Despine1
- Collegium Germanicum et Hungaricum1
- Coluccio Salutati1
- Coppo family1
- Cordwainer Smith1
- Cornelius John Hauck1
- Count Johann Nepomuk Wilczek1