Former Owner
- Raphael de Mediolano1
- Renzo Rizzi libri antichi1
- Richard Ashurst Bowie1
- Richard Bennett2
- Richard Heber11
- Richard Priestley1
- Riederer, Georg Wilhelm1
- Robert Branthwait1
- Robert Charles Winthrop1
- Robert Forrer1
- Robert Garrett5
- Robert Hoe III21
- Robert Lehman3
- Robert Wheeler Willson1
- Rolls1
- Rosamond B. Loring1
- Ross Winans1
- Rowland G. Hazard1
- Rudolf Busch1
- Saluti, Tomasso, active 20th century1