Former Owner
- Paul Joseph Sachs1
- Paul Louis Feiss1
- Pauline Fore Moffitt1
- Paulus de Graecus1
- Pedro García de Montoya1
- Petrus Hofstede1
- Petrus Molitor1
- Pettini Libraria di Antonio Pettini1
- Philadelphia Museum of Art1
- Philadelphia Rare Books & Manuscripts Company1
- Philip Augustus Hanrott1
- Philip C. Duschnes Rare Books & First Editions1
- Philip Hofer1
- Philip Kerr, 11th Marquess of Lothian1
- Philip van Alfen1
- Phoebe Hearst1
- Pierre Fraenkel1
- Pierre Pithou1
- Pietro Antonio Crevenna1
- Pietro Bembo1