Former Owner
- Paul Gottschalk1
- Paul Louis Feiss1
- Paul Riant2
- Pease, John William, 1820-19001
- Peter Arrell Brown Widener2
- Peter Arrell Brown Widener II2
- Peter Ludwig3
- Petrus Jensenius1
- Petrus Leonardus1
- Petrus Martinotius1
- Petrus Ysermans1
- Philip Carteret Webb1
- Philippe de Béthune1
- Phillip J. Pirages Fine Books & Manuscripts1
- Phyllis Walter Goodhart Gordan9
- Pierre Fraenkel1
- Pierre de La Vacherie1
- Pietro1
- Pietro Odescalchi1
- Prieuré Saint-Louis de Poissy1