Former Owner
- John Shirley1
- John Sidney Hawkins1
- John Singer Sargent1
- John Stirton1
- John Stow1
- John Taylor1
- Joseph Barrois1
- Joseph H. Haines1
- Joseph Jekyll1
- Julian I. Edison1
- Julius Heinrich Jeidels1
- Justin MacCarthy Reagh1
- Jān Sipār Khān ibn Rustamdilkhān1
- Karbalāʼī Muḥammad Ḥusayn Qāsimʹābādī1
- Kartause Erfurt1
- Khouri, Elias Alexander1
- Klaus Dieter Dahmen1
- Lambach Abbey1
- Laurence Kirby1
- Laurence Vaux1