Former Owner
- John Caryll1
- John D. Stanitz1
- John Harvey Treat1
- John Haskell Shedd1
- John Henry Ellis1
- John James Lewis1
- John Rolls, 1st Baron Llangattock1
- John Thomas Beer1
- John William Harshberger1
- Joseph Pope1
- Lane Theological Seminary1
- Laurence Kirby1
- Leonello d'Este, Marquis of Ferrara1
- Lorenzo de Olivera1
- Louis Charles Elson1
- Louis N. Cassett1
- Luigi Serra di Cassano1
- Lyon Cathedral1
- Maggs Bros Ltd1
- Manookjee Sorabjee Ashburner1