Former Owner
- John Lee1
- John Leeche1
- John Lumley, 1st Baron Lumley1
- John Patteson1
- John Roland Abbey1
- John Ruskin1
- John Savile1
- John Singer Sargent1
- John Thomas Beer1
- Joseph Anton Koch1
- Joseph L. Lilly1
- Joseph Pope1
- Joseph-Félix Allard1
- Juan Antonio de la Reguera1
- Judith Lady Montefiore College1
- Julius de Cardelinis1
- Jérôme Bignon1
- Kartause Erfurt1
- Kloster Bredelar1
- Kloster Rebdorf1