Former Owner
- John Roland Abbey1
- John Rolls, 1st Baron Llangattock1
- John Ruskin1
- John Towneley1
- John Wallop, Viscount Lymington1
- John Ward, 1st Earl of Dudley1
- Joost Ritman1
- Jorge de Ataíde1
- Joseph Neeld1
- Juan Burgueño1
- Juan de Gayferos de Eguiraum1
- Juan de Iriarte y Cisneros1
- Judith Lady Montefiore College1
- Julian Burgueño1
- Karen L. Gould1
- Karva, Lakṣmaṇabhaṭṭa1
- Katharinenkirche, Nuremberg1
- Katherine Petersen1
- Katherine Somerset Wyttenbach Fenwick1
- Kavīndrācārya, approximately 1600-approximately 16751