Former Owner
- John Eliot Hodgkin1
- John Frederick Lewis66
- John Roland Abbey1
- John Ruskin4
- John Topham1
- John Trotter Brockett1
- John West, 1st Earl De La Warr1
- John Wright1
- Joseph E. Widener8
- Joseph François René de Kergariou1
- Joseph Jekyll1
- Josephine Widener Wichfield2
- Juan Burgueño1
- Juan de Londono1
- Julian Burgueño1
- Justin MacCarthy Reagh1
- Katherine Petersen1
- King Lawrence Parker1
- Kloster Kuringen1
- Konrad von Maurer1