Former Owner
- Laurence Hilliard1
- Laurence William Hodson1
- Leicester Harmsworth1
- Leonardo Lapiccirella1
- Lima Public Library1
- Lionel Tollemache, 4th Earl of Dysart1
- Llanthony Priory1
- Louis II, Count of Flanders1
- Louis N. Cassett1
- Lucrezio Palladio degli Olivi1
- Ludwig Rosenthal1
- Lyon Cathedral1
- Léon Gruel1
- L’Art Ancien1
- Maksymilian Mielzynski1
- Mannheimer Hofbibliothek1
- Margaret Anna Hazard1
- Martin Schøyen1
- Mary Bloch1
- Mayfair Rare Books and Manuscripts1