- Milo, Professor1
- Minor, Thomas C. (Thomas Chalmers), 1846 or 1847-19122
- Mitchell, John K. (John Kearsley), 1859-19171
- Mitchell, S. Weir (Silas Weir), 1829-19142
- Mitchell, S. Weir (Silas Weir), 1829-1914 author3
- Mitchell, S. Weir (Silas Weir), 1829-1914, author1
- Mitchell, Thomas D. (Thomas DucheĢ), 1791-18651
- Mix, Charles L. (Charles Louis), 1869-1935, author1
- Montandon, A. L. (Arnold Lucien), 1852-1922, author1
- Montgomery, Joseph Fauntleroy, 1812-1883 author1
- Mooney, James, 1861-1921 author1
- Mooney, James, 1861-1921, author1
- Morton Testimonial Association.1
- Morton, Thomas G. (Thomas George), 1835-19032
- Morton, William J. (William James), 1846-19201
- Moschzisker, F. A. von (Franz Adolph)1
- Mott, Valentine, 1785-18651
- Mower Hospital (Philadelphia, Pa.)1
- Munford, Samuel E., 1837-1893, author1
- Munn, William P. (William Phipps), 1864-1903, author1