Former Owner
- John McRay1
- John Morley1
- John Pery1
- John Roland Abbey1
- John Ruskin1
- John Shirley1
- John Sidney Hawkins1
- John Singer Sargent1
- John Stirton1
- John Stow1
- John Taylor1
- Joseph Barrois1
- Joseph H. Haines1
- Joseph Jekyll1
- Julian I. Edison1
- Julie Florence de Cossette1
- Julius Heinrich Jeidels1
- Justin MacCarthy Reagh1
- Jān Sipār Khān ibn Rustamdilkhān1
- Karbalāʼī Muḥammad Ḥusayn Qāsimʹābādī1