Former Owner
- Omaha Public Library1
- Otto Orren Fisher1
- Otto Schäfer1
- Paolo Giovio1
- Paul III1
- Peretz ben Yehuda Mintz Ashkenazi1
- Philip Hurd1
- Philip Kerr, 11th Marquess of Lothian1
- Philip of the Palatinate1
- Philippe Hurault de Cheverny1
- Phillip J. Pirages Fine Books & Manuscripts1
- Phoebe Hearst1
- Phyllis Walter Goodhart Gordan1
- Pierre Gélis-Didot1
- Pietro Antonio Crevenna1
- Pietro Giuseppe Ignati Mattei Cattochii1
- Pietro Millini1
- Poor Clares1
- Prince Augustus Frederick, Duke of Sussex1
- Prosper Blanchemain1