Former Owner
- Reiss & Son1
- Rendell1
- Reuschenberg, Margreta von1
- Rev. Frederick Collins Wilson1
- Richard Bennett1
- Richard McKeon1
- Rinaldo Ridolfini1
- Robert Lehman1
- Robert Samuel Turner1
- Robert Treswell1
- Robert Walker1
- Robert de Mol1
- Roderick Terry1
- Royal Monastery of Saint Mary of Guadalupe1
- Rudolf Busch1
- Rudolf Hofmeister1
- Ruth E. Adomeit1
- Sabina Sopheija Behren1
- Sam Fogg Rare Books & Manuscripts1
- Samuel Allan1