- Maetzold, E. F. 1
- Magnus, Charles (publisher)1
- Manning, R. W. 1
- Martin, John1
- Martin, John Z. 1
- Mayer, Fred W. 1
- McCarron, Chas. R (Charles R.), 1891-1919 1
- McCollum, E. E.1
- McConnell, Geo. B. (George Burnham), 1894-1982 1
- McDowell, H. (publisher)1
- McHugh, Jimmy, 1894-19691
- McKenna, William J., 1881-1950 1
- McNaughton, Charles1
- Melish, John, 1771-18221
- Melish, John, 1771-1822 (cartographer)1
- Merrill, Blanche 1
- Meyer, George W. 1884-19591
- Mills, Joy 1
- Mills, Robert 1781-18551
- Mitchell, Sidney D., 1888-19421