Former Owner
- Oliver Henry Perkins1
- Oliver R. Barrett1
- Omaha Public Library1
- Otto Jahn1
- Otto Schäfer1
- P. Desq1
- Paolo Giovio1
- Paul III1
- Peretz ben Yehuda Mintz Ashkenazi1
- Philip Augustus Hanrott1
- Philip Hurd1
- Philip Kerr, 11th Marquess of Lothian1
- Philip of the Palatinate1
- Philippe Hurault de Cheverny1
- Philippe II de Croÿ1
- Phyllis Walter Goodhart Gordan1
- Pierre Gélis-Didot1
- Pierre Tassel1
- Pietro Antonio Crevenna1
- Pietro Giuseppe Ignati Mattei Cattochii1