Former Owner
- J.J. Middleton1
- Jacob Henry Burn1
- Jacob Riegel1
- James K. Moffitt1
- Jean-Baptiste Huzard1
- Jesuit College of San Bartolomeo1
- Johannes Baptista Siccus1
- John C. Jackson1
- John Camp Williams1
- John D. Stanitz1
- John Lee1
- John Ruskin1
- John Ward, 1st Earl of Dudley1
- Katherine Somerset Wyttenbach Fenwick1
- Lathrop C. Harper, Inc.1
- Leo Olschki1
- Lionardo di Paolo Adimari1
- Lorenzo Antonio da Ponte1
- Ludwig Rosenthal's Antiquariaat1
- Luigi Celotti1