Former Owner
- Jacques Auguste de Thou1
- Jacques Rosenthal1
- James & Mary Lee Tregaskis (Firm)1
- James Halliwell-Phillipps1
- James K. Moffitt1
- James Ley, 1st Earl of Marlborough1
- James Lyell1
- James Rathwell Page1
- James Rimell & Son1
- James Stevens-Cox1
- Jan Six VII1
- Jean-Jacques Charron1
- Jeremy C. Jackson1
- Joachim Guerrinus de Montefegatesio1
- Joannes Aloysius Brochman1
- Johann Heinrich van Ess1
- Johannes Vivianus1
- Johannes Wigg1
- John Josias Conybeare1
- John Milne Buckie1