Former Owner
- Rowland G. Hazard1
- Royal Library of Belgium1
- Rudolf Busch1
- Rudolph Feilding, 8th Earl of Denbigh1
- Rudolph Frederick Kelker1
- Rudolphus Rasser Donatus1
- Rugby School1
- Rush Hawkins1
- Rushton Mather Dorman2
- Ruth Cheney Streeter1
- Ruth E. Adomeit2
- Ruth Fowler Jarvis3
- Sabin1
- Saeed Nafisi1
- Saint Michael's Church, Ghent1
- Saint Mihiel Abbey1
- Saluti, Tomasso, active 20th century1
- Sam Fogg Rare Books & Manuscripts1
- Samuel Allen3
- Samuel Butler1