Former Owner
- Robert Williams1
- Robson & Kerslake1
- Rudolf Busch1
- Rush Hawkins1
- Ruth Cheney Streeter1
- Sabin1
- Saluti, Tomasso, active 20th century1
- Samuel Dennis1
- Samuel P. Avery Jr.1
- Samuel Putnam Avery1
- Sandbergs Bokhandel1
- Sebastienne Boscher1
- Simon Gratz1
- Sir Godfrey Webster1
- Sir Henry St John-Mildmay, 4th Baronet1
- Sir John Thorold, 10th Baronet1
- Sir William Henry Ingilby, 4th Bt.1
- Sir William Stirling-Maxwell, 9th Baronet1
- St. Mary's College1
- Stephen Butler Rare Books & Manuscripts1