Former Owner
- John III of Portugal2
- John Ives2
- John Lee2
- John Roland Abbey2
- John Rolls, 1st Baron Llangattock2
- John Thomas Beer2
- John Topham2
- John Towneley2
- John Wright2
- Joseph Haslewood2
- Josephine Widener Wichfield2
- Kaikhusroo Minocher Jamaspasa2
- Karl F. Morrison2
- Karva, Lakṣmaṇabhaṭṭa2
- Katharinenkirche, Nuremberg2
- Kenneth J. "Bud" Jennings2
- Lambach Abbey2
- Leonardo Lapiccirella2
- Lew David Feldman2
- Libreria la Bibliofila2