Former Owner
- Otto Haas1
- Parroco di Taviano, Luigi Bruno, active 20th century1
- Paul Gottschalk1
- Paul Gruel1
- Paul Sabatier3
- Peter Le Neve2
- Petrus Hofstede1
- Pettini Libraria di Antonio Pettini1
- Philadelphia Rare Books & Manuscripts Company1
- Philip C. Duschnes1
- Philip C. Duschnes Rare Books & First Editions1
- Philip Hofer1
- Philip van Alfen1
- Phillip J. Pirages Fine Books & Manuscripts2
- Pierre Pithou1
- Poor Clares1
- Quinton Edward Gurney1
- Québriac family1
- R. Stora and Company2
- Ramsau Monastery1