Former Owner
- Jay Gould1
- Jean-Frédéric Waldeck1
- Jo. Otho1
- Johann Egolph1
- John Alexander Stewart1
- John Bellingham Inglis1
- John Bulkeley1
- John Camp Williams1
- John D. Stanitz1
- John Fenn1
- John Holt1
- John Ruskin1
- John Sidney Hawkins1
- John Sotheby1
- Joseph L. Lilly1
- Joseph Mayner1
- Juan Burgueño1
- Judith Lady Montefiore College1
- Julian Burgueño1
- Kenneth Hyde1