Former Owner
- Richard Bennett1
- Richard Blount1
- Richard Linenthal1
- Robert Brodhead Honeyman2
- Robert Charles Winthrop1
- Robert H. Sayre1
- Robert Hoe III37
- Robert Lehman2
- Robert Williams1
- Robson & Kerslake1
- Rudolf Busch2
- Rudolph B. Gottfried1
- Rush Hawkins1
- Ruth Cheney Streeter1
- Ruth E. Adomeit3
- Ruth Fowler Jarvis3
- Sabin1
- Sabina Sopheija Behren1
- Saluti, Tomasso, active 20th century1
- Sam Fogg Rare Books & Manuscripts1