Former Owner
- John Ruskin2
- John Vyfyan1
- Joseph Barrois5
- Joseph E. Widener1
- Joseph Pope3
- José Antonio Conde1
- Judah ben Moses, ha-Rofe, ha-Kohen1
- Justin MacCarthy Reagh1
- Karen L. Gould4
- Keith Jarvis1
- Kenneth X. Robbins1
- Kloster Rebdorf1
- L. C. Harper1
- Lane Theological Seminary2
- Lathrop Colgate Harper2
- Laurence Hilliard1
- Laurence William Hodson2
- Lawrence J. Schoenberg15
- Leicester Harmsworth1
- Leonardo Lapiccirella1