Former Owner
- Philip Augustus Hanrott1
- Philip C. Duschnes1
- Philip C. Duschnes Rare Books & First Editions1
- Philip Kerr, 11th Marquess of Lothian1
- Philip Robinson1
- Philip van Alfen1
- Philippe Desportes1
- Pierre Fraenkel1
- Pierre Gorman1
- Pierre Pithou1
- Pietro Antonio Crevenna1
- Pietro Bembo1
- Pius XI1
- Poblet Monastery1
- Poor Clares1
- Preston A. Perry1
- Quinton Edward Gurney1
- Québriac family1
- R. F. Pain1
- R. H. Fenn1