Former Owner
- Nicolai Briganti1
- Nicolaus de Monte Murro1
- Norman H. Strouse1
- Oliver Henry Perkins1
- Omaha Public Library1
- Orlandus de Fatiis1
- Otto Jahn1
- Otto Vollbehr1
- Paolo Vimercati Sozzi1
- Parroco di Taviano, Luigi Bruno, active 20th century1
- Paul Gottschalk1
- Paul III1
- Paul Joseph Sachs1
- Paul Sabatier1
- Pazzi family1
- Petrus Leonardus1
- Petrus Martinotius1
- Pettini Libraria di Antonio Pettini1
- Philip Augustus Hanrott1
- Philip Hofer1