Former Owner
- Philadelphia Rare Books & Manuscripts Company1
- Philibert-Charles-Marie Varenne de Fenille1
- Philip C. Duschnes2
- Philip C. Duschnes Rare Books & First Editions1
- Philip Hurd1
- Philip Kerr, 11th Marquess of Lothian1
- Philip Milburn3
- Philip Sills1
- Philippe Hurault de Cheverny1
- Philippe de Béthune1
- Phillip J. Pirages Fine Books & Manuscripts15
- Phyllis Walter Goodhart Gordan1
- Pierleone Leoni1
- Pierre Gorman1
- Pierre Gélis-Didot2
- Pierre Picard le Jeune1
- Pierre Pithou1
- Pierre de La Vacherie1
- Pietro Antonio Crevenna1
- Pius XI1