Former Owner
- Herschel V. Jones1
- Horace de Landau1
- House of Bentivoglio1
- House of Colonna1
- House of Sforza1
- I. I. Middleton1
- Ioannis Gennadios1
- Ioannēs Grēgoropoulos1
- Isabella d'Este1
- Jacques Rosenthal1
- Jacques Vellekoop1
- James Ellsworth1
- Jean Bondieu1
- Johan Meerman1
- Johannes Cuno1
- Johannes, de Sancto Nabore1
- John Alfred Wigan1
- John B. Stetson Jr.1
- John Bellingham Inglis1
- John Couch Adams1