Former Owner
- Otto Ege2
- Paolo Giovio2
- Paul Grinke1
- Paul Riant14
- Paul Sabatier1
- Peter Ludwig2
- Pettini Libraria di Antonio Pettini1
- Philip Kerr, 11th Marquess of Lothian1
- Phyllis Walter Goodhart Gordan4
- Piero Ginori Conti3
- Pierre Tassel1
- Pietro Antonio Maffei1
- Pietro Bembo1
- Pietro Civaleri1
- Prince Augustus Frederick, Duke of Sussex1
- Ramón de Mesonero Romanos1
- Raoul Chandon de Briailles1
- Rashīdī, Ibrāhīm ibn Yūsuf1
- Raymond Oliver1
- Reading Abbey1