Former Owner
- John Carter1
- John D. Stanitz1
- John Egerton, 1st Earl of Bridgewater1
- John Frederick Lewis29
- John Gunthorpe1
- John Henry Ellis1
- John Rushout, 2nd Baron Northwick1
- John Ruskin1
- John Stanley, 18th Earl of Derby1
- John Thomas Beer1
- John William Burns1
- Joost Ritman3
- Joseph Barrois9
- Juana Mendel1
- Judith Lady Montefiore College3
- Julia Burgess11
- Julius de Cardelinis1
- K-L1
- Karen L. Gould9
- Karl F. Morrison1