Former Owner
- Philippe II de Croÿ1
- Phillip J. Pirages Fine Books & Manuscripts2
- Phoebe Hearst2
- Phyllis Walter Goodhart Gordan1
- Piero Ginori Conti4
- Pierre Gélis-Didot1
- Pierre Tassel1
- Pietro Antonio Crevenna1
- Pietro Giuseppe Ignati Mattei Cattochii1
- Pietro Millini1
- Poor Clares1
- Prince Augustus Frederick, Duke of Sussex2
- Prince Sadruddin Aga Khan2
- Prosper Blanchemain1
- R. A. Godwin-Austen1
- Raffaello de’ Medici1
- Raoul Chandon de Briailles1
- Raoul Léonor Lignerolles1
- Raphael King1
- Raphael Nathan Nata Rabinowitz1