Former Owner
- Paul Durrieux1
- Percy Mordaunt Barnard2
- Petrus Hofstede1
- Philadelphia Rare Books & Manuscripts Company1
- Philip C. Duschnes2
- Philip C. Duschnes Rare Books & First Editions1
- Philip Kerr, 11th Marquess of Lothian1
- Philip Milburn2
- Philip Sills1
- Philippe de Béthune1
- Phillip J. Pirages Fine Books & Manuscripts15
- Pierleone Leoni1
- Pierre Gorman1
- Pierre Gélis-Didot1
- Pierre Picard le Jeune1
- Pierre Pithou1
- Placida Mahl1
- Pontigny Abbey1
- Prieuré Saint-Louis de Poissy1
- Prince Augustus Frederick, Duke of Sussex2