Former Owner
- John Roland Abbey1
- John Ruskin1
- John Shelton Lawrence1
- John Sotheby1
- John Towneley1
- John Ward, 1st Earl of Dudley1
- Joseph Ernst Koch-Sternfeld1
- Juan Burgueño1
- Juan de Gayferos de Eguiraum1
- Juana I of Castile1
- Julian Burgueño1
- Justin MacCarthy Reagh1
- Jérôme Pichon1
- Kang Youwei1
- Karl Hermann Berendt1
- Katherine Somerset Wyttenbach Fenwick1
- Konrad von Maurer1
- L. Paganthus1
- Lambach Abbey1
- Lathrop C. Harper, Inc.1