Former Owner
- Coella Lindsay Ricketts8
- Coggeshall Abbey1
- Collegium Agennensis societatis Jesu (Agen, France)1
- Collegium Germanicum et Hungaricum1
- Collège Saint-Clément1
- Cologne Charterhouse2
- Coluccio Salutati2
- Convent of San Domenico1
- Coppo family1
- Cordwainer Smith1
- Cornelius John Hauck1
- Count Johann Nepomuk Wilczek1
- Couvent des pères Franciscains (Monte-Carlo, Monaco)1
- Cox Macro2
- Craven Ord1
- Cristoferus Chrewczer1
- Curt H. Reisinger1
- Cyrus Adler2
- D. Andreas Parisino1
- D. Manning1