Former Owner
- Coggeshall Abbey1
- Collège Saint-Clément1
- Compagnia della Vergine Maria (Cento, Italy)1
- Comte André de Riaucourt1
- Comte Chandon de Briailles1
- Comte d'Aspremont-Lynden1
- Condat Abbey1
- Confraternity of the Five Wounds at the Church of Saint-Pierre-La-Tour, Le-Puy-en-Velay1
- Constance de Foix1
- Convent San Marco1
- Convent of San Domenico1
- Convento di San Paolo1
- Coppo family1
- Cordwainer Smith1
- Cornelius John Hauck1
- Cosimo de' Medici1
- Count Alexis de Golowkin1
- Couvent des pères Franciscains (Monte-Carlo, Monaco)1
- Cristoferus Chrewczer1
- Curt H. Reisinger1