Former Owner
- Petrus Jensenius1
- Petrus Joseph Puccius1
- Petrus Molitor1
- Petrus Ysermans1
- Petrus de Thureyo1
- 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 Carteret Webb1
- Philip Hofer1
- Philip III the Good1
- Philip Jacob Grangier1
- Philip Kerr, 11th Marquess of Lothian1
- Philip van Alfen1
- Philippe de Béthune1
- Phoebe Hearst1
- Piero Ginori Conti1
- Pierre Fraenkel1