Former Owner
- John Singer Sargent1
- John Taylor1
- John Thomas Beer1
- John Towneley1
- Joseph Anton Koch1
- Joseph Ernst Koch-Sternfeld1
- Joseph Halle Schaffner1
- Joseph Pope1
- Joseph ben Aryeh1
- Joseph-Félix Allard1
- Juan Antonio de la Reguera1
- Juan Burgueño1
- Juan de Gayferos de Eguiraum1
- Juana I of Castile1
- Judah ben Moses, ha-Rofe, ha-Kohen1
- Julian Burgueño1
- Julius de Cardelinis1
- Jérôme Bignon1
- Kartause Erfurt1
- Kenneth X. Robbins1