Former Owner
- Oswald Carl Friedrich von Seilern und Aspang1
- Owen D. Young1
- P. Desq1
- Pangracius Chrewczer1
- Paolo Gallo1
- Pascal Gay1
- Paul Gottschalk1
- Paul Sabatier1
- Pauline Fore Moffitt1
- Pedro García de Montoya1
- Peter Le Neve1
- Petrus Giraud1
- Petrus Molitor1
- Petrus de Thureyo1
- Philip Carteret Webb1
- Philip III the Good1
- Philip Kerr, 11th Marquess of Lothian1
- Philip Robinson1
- Philippe II de Croÿ1
- Phillip J. Pirages Fine Books & Manuscripts1