Former Owner
- Pascal Gay1
- Paul Gottschalk1
- Peter Arrell Brown Widener1
- Petrus Giraud1
- Petrus Hofstede1
- Philadelphia Rare Books & Manuscripts Company1
- Philip C. Duschnes1
- Philip C. Duschnes Rare Books & First Editions1
- Philip Hurd1
- Philip Kerr, 11th Marquess of Lothian1
- Philippe Hurault de Cheverny1
- Philippe de Béthune1
- Phyllis Walter Goodhart Gordan1
- Pierleone Leoni1
- Pierre Gorman1
- Pierre Picard le Jeune1
- Pierre Pithou1
- Pierre de La Vacherie1
- Pietro Antonio Crevenna1
- Pius XI1