Former Owner
- Juan Rodriguez1
- Juan de Gayferos de Eguiraum1
- Juan de Iriarte y Cisneros1
- Juana I of Castile1
- Judith Lady Montefiore College3
- Julian Burgueño1
- Julian I. Edison1
- Julius Heinrich Jeidels1
- Justin MacCarthy Reagh1
- Jérôme Pichon2
- Jón Þorstensson1
- Kang Youwei1
- Karen L. Gould3
- Karl Hermann Berendt1
- Karl Wilhelm Hiersemann6
- Katharinenkirche, Nuremberg1
- Katherine Somerset Wyttenbach Fenwick1
- Konrad von Maurer3
- L. Paganthus1
- Lady Frances Bentinck1