Former Owner
- Paul Sabatier1
- Peter Arrell Brown Widener2
- Peter Arrell Brown Widener II2
- Peter Le Neve1
- Petrus Hofstede1
- Petrus Jensenius1
- Petrus Ysermans1
- Philadelphia Rare Books & Manuscripts Company1
- Philip C. Duschnes1
- Philip Hofer1
- Philip Hurd1
- Philip Kerr, 11th Marquess of Lothian2
- Philip Robinson1
- Philippe Hurault de Cheverny1
- Philippe de Béthune1
- Phillip J. Pirages Fine Books & Manuscripts2
- Phyllis Walter Goodhart Gordan8
- Pierre Gélis-Didot1
- Pierre Pithou1
- Pierre de La Vacherie1