Former Owner
- John Morley1
- John Pery1
- John Roland Abbey1
- John Rolls, 1st Baron Llangattock1
- John Ruskin1
- John Shirley1
- John Sidney Hawkins1
- John Stow1
- John Taylor1
- Joseph H. Haines1
- Joseph Jekyll1
- José Fernando Ramírez1
- Juan de Gayferos de Eguiraum1
- Justin MacCarthy Reagh1
- Jān Sipār Khān ibn Rustamdilkhān1
- Kaikhusroo Minocher Jamaspasa1
- Karbalāʼī Muḥammad Ḥusayn Qāsimʹābādī1
- Khouri, Elias Alexander1
- King Lawrence Parker1
- Laurence Vaux1