- Maclean, Donald, M.D., author4
- Maisch, John M. (John Michael), 1831-18934
- Mall, Franklin P. (Franklin Paine), 1862-1917, author4
- Mallet, John William, author4
- Mann, Matthew D. (Matthew Darbyshire), 1845-1921, author4
- Marshall, John, 1855-1925, author4
- Martinez del Rio, Pablo, 1805-1882, author4
- Mason, John J., author4
- Massachusetts College of Pharmacy.4
- Massachusetts, enacting jurisdiction.4
- Massey, G. Betton (George Betton), 1856-19274
- Mastin, William McDowell, author4
- Mattson, M. (Morris), 1809?-18854
- May, Charles Henry, 1861-1943 author4
- McLaughlin, J. W. (James Wharton), 1840-1909, author4
- McMurtry, L. S. (Lewis Samuel), 1850-1924, author4
- McNutt, W. F. (William Fletcher), 1839- author4
- McQuillen, J. H. (John Hugh), 1826-18794
- McQuillen, J. H. (John Hugh), 1826-1879 author4
- Medico-Legal Society of New York, author.4