- Mackenzie, John N., author1
- Maclean, John, 1771-18141
- Magendie, François, 1783-18551
- Magill, Alfred T. (Alfred Thruston), 1804-18371
- Mallet, John William, author1
- Manton, Walter Porter, 1857-19251
- Manton, Walter Porter, 1857-1925, author1
- March, Alden, 1795-18691
- Marshall, N. B.1
- Martin, H. Newell (Henry Newell), 1848-18961
- Mason, Otis T., 1838-1908, author1
- Maupin, S. (Socrates), 1808-18711
- McDowell, Joseph N. (Joseph Nash), 1805-18681
- Mease, James, 1771-18461
- Merrill, A. P. (Ayres Phillips), 1793-18731
- Michael, Helen Abbott, 1857-1904, author1
- Miller, Henry, 1800-18741
- Mills, Charles K. (Charles Karsner), 1845-1931, author1
- Montgomery, Joseph Fauntleroy, 1812-18831
- Moore, William Oliver, author1