Former Owner
- Norman H. Strouse1
- Novalesa Abbey1
- Oliver Henry Perkins1
- Omaha Public Library1
- Orlandus de Fatiis1
- Otto Ege2
- Otto Jahn1
- Otto Vollbehr1
- Paolo Guerrini1
- Paolo Vimercati Sozzi1
- Parroco di Taviano, Luigi Bruno, active 20th century1
- Paul Gottschalk1
- Paul III1
- Paul Joseph Sachs1
- Paul Riant13
- Paul Sabatier2
- Pazzi family1
- Petrus Leonardus1
- Petrus Martinotius1
- Petrus Molitor1