- Maguire, David, author4
- Maine. State Board of Health, author.4
- Maisch, John M. (John Michael), 1831-18934
- Manley, Thomas H. (Thomas Henry), 1851-1905 author4
- Marsh, Elias J. (Elias Joseph), 1835-1908, author4
- Martin, Alejandra, author4
- Martin, H. Newell (Henry Newell), 1848-18964
- Massachusetts Medical Society, author.4
- Medical Society of the County of New York.4
- Medico-Legal Society of New York, author.4
- Meigs, J. Forsyth (John Forsyth), 1818-18824
- Miller, W. D. (Willoughby Dayton), 1853-1907, author4
- Mitchell, Clifford, 1854-1939, author4
- Morris, Henry, 1855-19294
- Morse, D. A. (David Appleton), 1840-4
- Morton, William J. (William James), 1846-1920, author4
- Moschzisker, F. A. von (Franz Adolph)4
- Moss, Kellie, author4
- Mudrazija, Stipica, author4
- Mutual Life Insurance Company of New York, author.4