Former Owner
- Ludwig Rosenthal1
- Luigi Arrigoni1
- Luis Ordoñez1
- Luther Albertus Brewer1
- M. Louise Stowell1
- Maggs Bros Ltd4
- Mannheimer Hofbibliothek1
- Marcantonio Contarini1
- Marchese Linterno1
- Margaret Le Seigneur1
- Maria Riddell1
- Marie-François Duchesne de Beaumanoir1
- Martin Breslauer1
- Menno Hertzberger1
- Messieurs Du Trieu2
- Mitchell Starrett Buck1
- Monastery of Benevívere1
- Mushtaq Ali Khan I of Rampur1
- Muḥammad Bāqir1
- Muḥammad Bāqir Shīrāzī1