Former Owner
- Norman H. Strouse1
- Orlandus de Fatiis1
- Otto Ege1
- Paolo Guerrini1
- Parroco di Taviano, Luigi Bruno, active 20th century1
- Paul Gottschalk1
- Paul Joseph Sachs1
- Paul Sabatier1
- Pazzi family1
- Petrus Molitor1
- Petrus de Thureyo1
- Pettini Libraria di Antonio Pettini1
- Philip Augustus Hanrott1
- Philip Hofer1
- Piero Ginori Conti1
- Pierre Pithou1
- Pietro1
- Pietro Bembo1
- Pietro Odescalchi1
- Preston A. Perry1