Former Owner
- Robert Brodhead Honeyman2
- Robert H. Sayre1
- Robert Hoe III9
- Robert Manning Strozier Library1
- Robert Williams1
- Rudolf Busch1
- Rush Hawkins1
- Ruth Cheney Streeter1
- Sabin1
- Saluti, Tomasso, active 20th century1
- Sam Fogg Rare Books & Manuscripts1
- Samuel Dennis1
- Samuel Whitaker Pennypacker1
- Sandbergs Bokhandel1
- Sather, Eugene E. (Eugene Earl), 1924-19861
- Sebastienne Boscher1
- Simon Gratz2
- Sir Godfrey Webster1
- Sir Henry St John-Mildmay, 4th Baronet1
- Sir John Peachey1