Former Owner
- Patrick Brady1
- Paul Grinke1
- Paul Gruel1
- Paul Riant1
- Paul Sabatier1
- Payre-Grolée-Virville family1
- Penzance Library1
- Percy Mordaunt Barnard1
- Petrus Giraud1
- Petrus Hofman Peerlkamp1
- Philip C. Duschnes2
- Philip Hofer1
- Philip Robinson1
- Philip Sills1
- Phillip J. Pirages Fine Books & Manuscripts5
- Pierleone Leoni2
- Pierre Gorman1
- Pierre Gélis-Didot1
- Placida Mahl1
- Poblet Monastery1