Former Owner
- Charles D. Humberd1
- Charles E. Roseman Jr.1
- Charles Hurleston1
- Charles Kothen1
- Charles Marriette1
- Charles Seymour, 6th Duke of Somerset1
- Charles Singer1
- Charles Stephen Ascherson1
- Chartreuse Saint-Sixte de Rettel1
- Chasseigne family1
- Clarence S. Bement1
- Claude Augustin de Cosson1
- Clemente Carilli1
- Coella Lindsay Ricketts1
- Collegium Germanicum et Hungaricum1
- Count Johann Nepomuk Wilczek1
- Cristoferus Chrewczer1
- D. Andreas Parisino1
- Dean Putnam Lockwood1
- Dionysiĭ Vasilevich1