Former Owner
- John Bulkeley1
- John Camp Williams1
- John Sidney Hawkins1
- Joseph L. Lilly1
- Judith Lady Montefiore College1
- Kenneth Hyde1
- Konrad von Maurer1
- Lancino Curti1
- Laurence Kirby1
- Law Society1
- Leicester Harmsworth1
- Leonard Grey, 1st Viscount Grane1
- Lionardo di Paolo Adimari1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Lodovicus Saltariellus1
- Lorenzo Antonio da Ponte1
- Louis César de La Baume Le Blanc1
- Louis Thompson Rowe1
- Ludwig Rosenthal's Antiquariaat1
- Luigi Clerici1