Former Owner
- Cosimo de' Medici1
- Count Alexis de Golowkin1
- Count Johann Nepomuk Wilczek1
- Couvent des Minimes (Clermont-Tonnerre, France)1
- Cox Macro1
- Craven Ord1
- Cristoferus Chrewczer1
- Curt H. Reisinger1
- Cyrus Adler1
- D'Assonleville family1
- D. D. Horatius Bosner1
- D. Manning1
- Dahīʹzādah1
- Dame Margery Byrkenhed1
- Damiano Muoni1
- Dana Hill1
- Daniele Florio1
- Darvīsh Asʻad ibn ʻAbd al-Karīm ʻArab1
- David Gordon Lyon1
- David Pulsifer1