Former Owner
- Christine Blondeau1
- Christopher Cheney1
- Church of St James, Sarsden1
- Cini Johan de Barisani1
- City College of New York1
- Clarence Howard Clark, Sr.1
- Claude Joseph Constant Despine1
- Claude Le Muet1
- Claude de Fonsèque1
- Clemente Carilli1
- Collegium Germanicum et Hungaricum1
- Comte André de Riaucourt1
- Convent San Marco1
- Coppo family1
- Cordwainer Smith1
- Cornelius John Hauck1
- Cosimo de' Medici1
- Count Alexis de Golowkin1
- Count Johann Nepomuk Wilczek1
- Cristoferus Chrewczer1