Former Owner
- Paolino Gianfilippi1
- Parroco di Taviano, Luigi Bruno, active 20th century1
- Paul Gottschalk1
- Paul Sabatier1
- Paul de Berthou1
- Peter Ludwig1
- Petrus Hofstede1
- Petrus de Thureyo1
- Pettini Libraria di Antonio Pettini1
- Philadelphia Rare Books & Manuscripts Company1
- Philip C. Duschnes Rare Books & First Editions1
- Philip Hofer1
- Pierre Pithou1
- Pietro Antonio Crevenna1
- Pietro Antonio Maffei1
- Pietro Canal1
- Pietro Giometti1
- Pius VI1
- Prince Augustus Frederick, Duke of Sussex1
- Quinton Edward Gurney1