Former Owner
- Philippe de Béthune1
- Phillip J. Pirages Fine Books & Manuscripts1
- Phyllis Walter Goodhart Gordan1
- Pierleone Leoni1
- Pierre Gélis-Didot1
- Pierre Pithou1
- Pierre Tassel1
- Pierre de La Vacherie1
- Prieuré Saint-Louis de Poissy1
- Québriac family1
- R. A. Godwin-Austen1
- Raymond Oliver1
- René Antoine Thoué1
- Ricardo, Conde de Benahavis Heredia1
- Richard Heber1
- Robert H. Sayre1
- Robert Lehman1
- Roderick Terry1
- Ross Winans1
- Royaumont Abbey1