Former Owner
- Nicolaus de Monte Murro1
- Norman H. Strouse1
- Novalesa Abbey1
- Omaha Public Library1
- Orlandus de Fatiis1
- Otto Vollbehr1
- Paolo Vimercati Sozzi1
- Parroco di Taviano, Luigi Bruno, active 20th century1
- Paul Gottschalk1
- Paul III1
- Paul Joseph Sachs1
- Pazzi family1
- Petrus Molitor1
- Petrus de Thureyo1
- Pettini Libraria di Antonio Pettini1
- Philip Augustus Hanrott1
- Philip Hofer1
- Philippe Desportes1
- Pierleone Leoni1
- Piero Ginori Conti1