- Lowther, Hugh Cecil, Earl of Lonsdale--Bookplate1
- Majūsī, ʻAlī ibn al-ʻAbbās, active 10th century-11th century.1
- Marbot, Jean Antoine de, 1754-1800--Portraits1
- Marshall, Harold--Bookplate1
- Marshall, J. T.--Autograph1
- Marston, Thomas E.--Bookplate.1
- Maskell, William,--1814?-1890--Autograph1
- Medici, House of1
- Merriam, Olin Lane--Autograph.1
- Merriam, Olin Lane--Bookplate.1
- Milbourn, Emma--Autograph1
- Milward, Ri.--(Richard),--1609-16801
- Moore, Henry, 1831-1895--Autograph1
- Newcastle, John,--Duke of--Bookplate.1
- North, Frederick, Earl of Guilford, 1766-1827, bookplate.1
- Paganini, Nicolò, 1782-1840--Portraits1
- Pazzi family1
- Pico della Mirandola, Giovanni, 1463-1494.1
- Pope, Alexander,--1688-1744--Ms. notes1
- Rastell, William, 1508?-1565.1
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