- Medical and Chirurgical Faculty of the State of Maryland. Library.1
- Meigs, James Aitken, 1829-18792
- Meigs, James Aitken, 1829-1879, author1
- Melendy, Mary Ries, 1841-1
- Mendenhall, George, 1814-18742
- Merlin, Lewis.1
- Metropolitan Life Insurance Company.1
- Miles, Charles, medical botanist1
- Miller, Edward, 1760-18121
- Miller, Henry Lewis.1
- Miller, Thomas, 1806-18731
- Millingen, J. G. (John Gideon), 1782-18621
- Mills, William, doctor1
- Miltenberger, G. W. (George Warner), 1819-1905 author1
- Minot, Charles Sedgwick, 1852-19141
- Mitchell, John Kearsley, 1793-18581
- Mitchell, S. Weir (Silas Weir), 1829-1914, compiler1
- Mitchell, William, M.D1
- Monnett, H.1
- Morgan, James E. (James Ethelbert), 1822-18891