Former Owner
- J. Techener2
- James & Mary Lee Tregaskis (Firm)2
- James Bowen2
- Jay Gould2
- Joaquín Gómez de la Cortina2
- Johan Meerman2
- John Boyd Thacher I2
- John III of Portugal2
- John Patrick Auguste Madden2
- John Rolls, 1st Baron Llangattock2
- John Thomas Beer2
- John Topham2
- John Wright2
- Josephine Widener Wichfield2
- Karl F. Morrison2
- Kartause Erfurt2
- Kenneth J. "Bud" Jennings2
- Kloster Rebdorf2
- Leonardo Lapiccirella2
- Lionel Tollemache, 4th Earl of Dysart2