Former Owner
- Johannes Wesbach1
- Johannes, de Sancto Nabore1
- John Carter1
- John Edgar Ker1
- John Frederick Lewis1
- John Henry Nash1
- John Hunt1
- John Jarsey1
- John Lee1
- John Roland Abbey1
- John Rolls, 1st Baron Llangattock1
- John Ruskin1
- Joost Ritman1
- Julia Burgess1
- Karen L. Gould1
- Katherine Petersen1
- Katherine Somerset Wyttenbach Fenwick1
- Kenneth Hyde1
- Kloster Bredelar1
- Leo S. Olschki Editore1