Former Owner
- 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
- Samuel Dennis1
- Samuel P. Avery Jr.1
- Samuel Putnam Avery1
- Samuel Whitaker Pennypacker1
- Sandbergs Bokhandel1
- Sebastienne Boscher1
- Simon Gratz2