Former Owner
- Paul Riant6
- Paul Sabatier1
- Paul Viollet1
- Percy Mordaunt Barnard1
- Peter Arrell Brown Widener1
- Peter Arrell Brown Widener II2
- Petrus Hofstede1
- Philadelphia Rare Books & Manuscripts Company1
- Philibert-Charles-Marie Varenne de Fenille1
- Philip C. Duschnes1
- Philip C. Duschnes Rare Books & First Editions1
- Philip Hofer1
- Philip Hurd1
- Philip Kerr, 11th Marquess of Lothian1
- Philippe Desportes1
- Philippe Hurault de Cheverny1
- Philippe de Béthune1
- Phillip J. Pirages Fine Books & Manuscripts1
- Phyllis Walter Goodhart Gordan1
- Pierleone Leoni1