Former Owner
- 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
- Lajos Graf Apponyi de Nagy-Appony1
- Lancino Curti1
- Lathrop C. Harper, Inc.1
- Laurence Claiborne Witten II1
- Laurence Kirby1
- Laurence William Hodson1
- Laurentius van der Torqel1