- Jacobellus Augustini, Paniscaldi (Notary, Archive of Ceccano) Previous Owner
- Jacques Bongars, 1554-1612 Previous Owner
- Jacques Giunta, 1486-1546 Previous Owner
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Jacques, Bongars
Bongars, Jacques (1554-1612) Previous Owner - Jakob Graviseth von Landeck, 1598-1658 Previous Owner
- Jan Deschamps, 1917-2004 Previous Owner
- Jan Jacques Lambin, 1765-1841 Previous Owner
- Jarman, John Boykett (1782-1864) Previous Owner
- Jesuiten Previous Owner
- Jesuitenkolleg Solothurn Previous Owner
- Jesuitenkollegium Previous Owner
- Joachim Görsch Räurigener (fl. 1537) Previous Owner
- Johannes Aal 1500 Previous Owner
- Johannes Fabri de Abensbergk (Baccalaureatus 1464) Previous Owner
- Johannes Held de Neuburg (Baccalaureatus 1464) Previous Owner
- John Frederick Lewis, 1860-1932 Previous Owner
- Jozef-Maria De Smet, 1916-1996 Previous Owner