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- Macfarlan, Malcolm, 1841-1
- Maisch, John M. (John Michael), 1831-1893, author1
- Martius, Karl Friedrich Philipp von, 1794-18681
- Massachusetts Medical Society.1
- McCorkle, John A.1
- McKesson and Robbins, Inc. author.1
- McVickar, J. A. (John Augustus), 1812-18921
- Medical Society of the State of New York (1807- )1
- Mello Moraes, A. J. de (Alexandre José), 1816-18821
- Merrell, Albert, author1
- Merwin, John C.1
- Miles, Charles, medical botanist1
- Mitchell, Thomas D. (Thomas Duché), 1791-18651
- Mohr, Charles, 1844-19071
- Monroe, A. L. (Andrew Leight), 1856-1
- Najīb al-Dīn al-Samarqandī, Muḥammad ibn ʻAlī, -12221
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