Former Owner
- Charles Singer1
- Charles Stephen Ascherson1
- Claude Augustin de Cosson1
- Collegium Germanicum et Hungaricum1
- Cordwainer Smith1
- Cornelius John Hauck1
- Count Johann Nepomuk Wilczek1
- Cristoferus Chrewczer1
- D. Andreas Parisino1
- Dadabhoy Framji Rustamji Darabji1
- Dahīʹzādah1
- Damiano Muoni1
- David Solomon Sassoon1
- Dean Putnam Lockwood1
- Deva, Bālakṛṣṇa1
- Diego de Arce y Reinoso1
- Diego de Ayala1
- Domenico Silvio Passionei1
- Donaueschingen court library1
- Duncan Beresford-Jones1