Former Owner
- Robert Dechert1
- Robert Devereux, 2nd Earl of Essex1
- Robert Fyncham1
- Robert Lenkiewicz1
- Robert Neville1
- Robert Ranshaw1
- Robert Stayner Holford1
- Robert Wyer1
- Robert de Mol1
- Rosamond B. Loring1
- Ross Winans1
- Rugby School1
- Rushton Mather Dorman1
- Rāma Śarmmaṇ1
- Rāmeśara1
- S. Ereilter1
- Saeed Nafisi1
- Sakhārāmabhāṭṭa1
- Sam Fogg Rare Books & Manuscripts1
- Samuel Allan1