Former Owner
- Luini, Pacifico (Franciscan priest), active 19th century1
- Luther Albertus Brewer1
- Lutheran Theological Seminary at Philadelphia1
- Lydia Thompson Morris1
- Lyon Cathedral1
- Lālajī Śarmaṇ1
- Mahdī ibn Muṣṭafá al-Ḥusaynī1
- Maksymilian Mielzynski1
- Marchese Porri-Carcani1
- Margaret Le Seigneur1
- Margaret of Croy1
- Marguerite of Lorraine1
- Mary Schell Collins1
- Mary Talbot, Countess of Shrewsbury1
- Mayer Sulzberger1
- Mercantile Library Company1
- Minnis, Katherine1
- Morot1
- Morris Harold Saffron1
- Mortimer Loeb Schiff1