Former Owner
- Lisa Norris Elkins1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Lodovicus Saltariellus1
- Louis Bourguet1
- Louis César de La Baume Le Blanc1
- Louis XII of France1
- Ludwig Rosenthal1
- Luigi Arrigoni1
- Lydia Thompson Morris1
- Maksymilian Mielzynski1
- Mannheimer Hofbibliothek1
- Marcantonio Contarini1
- Marchese Linterno1
- Margaret Le Seigneur1
- Marguerite of Lorraine1
- Marie-François Duchesne de Beaumanoir1
- Menno Hertzberger1
- Mercantile Library Company1
- Monastery of Benevívere1
- Morot1