Authors: O
- Maginn, William 1793-1842
- Mailand, Oszkár 1858-1924
- Maillard, Olivier -1502
- Manninen, Otto 1872-1950
- Mantere, Oskari 1874-1942
- Marden, Orison Swett 1848-1924
- Marden, Thomas Owen, Sir 1866-
- Marinelli, Olinto 1874-1926
- Martin, O. B. (Oscar Baker) 1870-1935
- Mary Agnes, Sister, O.S.B. -
- Mason, Otis Tufton 1838-1908
- Mason, R. Osgood (Rufus Osgood) 1830-1903
- Masson, Rosaline 1867-1949
- Masterman, Charles F. G. (Charles Frederick Gurney) 1873-1927
- Mattsson, Gustaf 1873-1914
- Matull, Kurt 1872-1920
- Mayer, Otto -
- Mayreder, Rosa 1858-1938
- Mazengarb, O. C. (Oswald Chettle) 1890-1963
- McCannell, Otway 1883-1969
- McGrew, Paul O. (Paul Orman) 1909-1983
- McKay, David O. (David Oman) 1873-1970
- McWhorter, Lucullus Virgil 1860-1944
- Mencken, H. L. (Henry Louis) 1880-1956
- Merriman, Owen -
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