Former Owner
- Paul Joseph Sachs1
- Paul Louis Feiss1
- Paul Riant4
- Paul Sabatier1
- Pedro García de Montoya1
- Peter Le Neve1
- Petrus Giraud1
- Petrus Hofman Peerlkamp1
- Petrus Hofstede1
- Petrus Molitor1
- Philadelphia Rare Books & Manuscripts Company1
- Philip C. Duschnes1
- Philip C. Duschnes Rare Books & First Editions1
- Philip Hofer2
- Philip Kerr, 11th Marquess of Lothian1
- Philip van Alfen1
- Philippe de Béthune1
- Phillip J. Pirages Fine Books & Manuscripts1
- Pietro Odescalchi1
- Pius XI1