Former Owner
- John Leeche1
- John M Cuthbert1
- John Patteson1
- John R. Anderson & Co1
- John Rolls, 1st Baron Llangattock1
- John Shirley1
- John Swyntoun1
- John Thomas Beer1
- John Towneley1
- John Trotter Brockett1
- John William Harshberger1
- Jonathan Peckover1
- Joseph Anton Koch1
- Joseph François René de Kergariou1
- Joseph Görres1
- Joseph L. Lilly1
- Joseph Whitney1
- Joseph ben Aryeh1
- José Antonio Conde1
- Juana I of Castile1