Former Owner
- Rafael Floranes1
- Ramón de Mesonero Romanos1
- Raoul Chandon de Briailles1
- Raoul Léonor Lignerolles1
- Raphael de Mediolano1
- Renzo Rizzi libri antichi1
- Richard Ashurst Bowie1
- Robert Branthwait1
- Robert Charles Winthrop1
- Robert Forrer1
- Robert Wheeler Willson1
- Rolls1
- Rosamond B. Loring1
- Ross Winans1
- Rowland G. Hazard1
- Rudolf Busch1
- Saluti, Tomasso, active 20th century1
- Samuel Butler1
- Samuel Petit1
- Samuel Putnam Avery1