- McCombs, Robert S. (Robert Shelmerdine), 1880-, author1
- McCoy, Frank, author1
- McCutcheon, John T. (John Tinney), 1870-19491
- McDonald, Archibald Leete, 1879- author1
- McDougall, William, 1871-1938, author2
- McEwen, Robert Stanley, 1888-1967, author1
- McFarland, Joseph, 1868-1945 author1
- McKeever, William A. (William Arch), 1868-1940 author1
- McKenzie, R. Tait (Robert Tait), 1867-1938, author1
- McLaughlin, Allan J. (Allan Joseph), 1872-1961, author1
- McLean, McDugald, 1886-1922 author1
- McNair, James Birtley, 1889-1967, author1
- McNamara, Frank P., author1
- McQuillan, Arthur H. (Arthur Harold), 1895-1976, author1
- Meagher, John F. W. (John Francis Wallace), 1880-19311
- Meller, Josef, 1874- author1
- Melville, Norbert J. (Norbert John), 1884-, author1
- Millberry, Guy S. (Guy Stillman), 1872-1952, author1
- Mills, Philo Laos, author1
- Missouri Tuberculosis Association, author.1