Former Owner
- Claude Augustin de Cosson1
- Claude Joseph Constant Despine1
- Cloître de la Chartreuse du Val de Bénédiction1
- Coggeshall Abbey1
- Collegium Agennensis societatis Jesu (Agen, France)1
- Collegium Germanicum et Hungaricum1
- Collège Saint-Clément1
- Coppo family1
- Cornelius John Hauck1
- Count Johann Nepomuk Wilczek1
- Cox Macro1
- Craven Ord1
- Cristoferus Chrewczer1
- Curt H. Reisinger1
- Cyrus Adler1
- D. Andreas Parisino1
- D. Manning1
- Dadabhoy Framji Rustamji Darabji1
- Dahīʹzādah1
- Dame Margery Byrkenhed1