Former Owner
- John Roland Abbey1
- John Rolls, 1st Baron Llangattock1
- John Ruskin1
- John Shirley1
- John Sidney Hawkins1
- John Singer Sargent1
- John Stirton1
- John Stow1
- John Taylor1
- Joseph H. Haines1
- Joseph Jekyll1
- José Fernando Ramírez1
- Juan de Gayferos de Eguiraum1
- Julian I. Edison1
- Julie Florence de Cossette1
- Julius Heinrich Jeidels1
- Justin MacCarthy Reagh1
- Jān Sipār Khān ibn Rustamdilkhān1
- Kaikhusroo Minocher Jamaspasa1
- Karbalāʼī Muḥammad Ḥusayn Qāsimʹābādī1