Former Owner
- John Hope, 1st Marquess of Linlithgow1
- John Morgan1
- John Rolls, 2nd Baron Llangattock1
- John Rushout, 2nd Baron Northwick1
- John Ruskin1
- John Stanley, 18th Earl of Derby1
- John Thomas Beer1
- John Walker1
- John William Burns1
- Joseph E. Widener1
- Josiah H. Benton1
- Juana Mendel1
- Julie Florence de Cossette1
- Julius de Cardelinis1
- K-L1
- Karl F. Morrison1
- Keith Jarvis1
- Lancino Curti1
- Laura Hurd Motion1
- Laurence William Hodson1