Former Owner
- Petrus Leonardus1
- Petrus Martinotius1
- Phillip J. Pirages Fine Books & Manuscripts10
- Phoebe Hearst2
- Phyllis Walter Goodhart Gordan1
- Piero Ginori Conti1
- Pierre Fraenkel1
- Pieter Bondam1
- Pietro Dini1
- Pietro Giuseppe Ignati Mattei Cattochii1
- Pietro Millini1
- Prasana Kumar Bhallachiru1
- Prediger (Schwäbisch Gmünd)1
- Prince Augustus Frederick, Duke of Sussex2
- Prince Sadruddin Aga Khan6
- Puruṣottamadīkṣita1
- Pîrîzâde, Sayyid ʻAbd Allāh, Shaykh al-Islām1
- Pūrnnānanda Śarmmaṇ1
- Quinton Edward Gurney1
- Qusṭanṭīn ibn Lūdūlf1