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- Darko Macan (born 1966)
- James D. Macdonald (born 1954)
- John D. MacDonald (1916–1986)
- F. Gwynplaine MacIntyre (ca. 1948–2010?)
- R. W. Mackelworth (1930–2000)
- Katherine MacLean (born 1925)
- Ian R. MacLeod (born 1956)
- Ken MacLeod (born 1954)
- Angus MacVicar (1908-2001)
- Tom Maddox
- Charles Eric Maine (1921–1981) (pseudonym of David McIlwain)
- Donald Malcolm (1930–1975)
- Barry N. Malzberg (born 1939)
- Laurence Manning (1899–1972)
- Leo Margulies (1900–1975)
- Stephen Marley (born 1946)
- Paul Marlowe
- George R. R. Martin (born 1948)
- David Marusek (born 1951)
- Richard Matheson (born 1926)
- Julian May (born 1931)
- Paul J. McAuley (born 1955)
- Anne McCaffrey (1926–2011)
- Wil McCarthy (born 1966)
- David McDaniel (1944–1977)
- Jack McDevitt (born 1935)
- Ian McDonald (born 1960)
- Maureen F. McHugh (born 1959)
- J. T. McIntosh (born 1925)
- Vonda McIntyre (born 1948)
- Neil McMahon
- Sean McMullen (born 1948)
- Mike McQuay (1949–1995)
- John Meaney (born 1951)
- Capt. S.P. Meek (1894–1972)
- Richard C. Meredith (1937–1979)
- Robert Merle (1908–2004)
- Judith Merril (1923–1997)
- A. Merritt (1884–1943)
- Robert A. Metzger (born 1956)
- Gustav Meyrink (1868–1932)
- China Miéville (born 1972)
- P. Schuyler Miller (1912–1974)
- Walter M. Miller, Jr. (1923–1996) A Canticle for Leibowitz
- Edward Page Mitchell (1852–1927)
- Kirk Mitchell (born 1950)
- Syne Mitchell (born 1970)
- Naomi Mitchison (1897–1999)
- Premendra Mitra (1904–1988)
- L. E. Modesitt, Jr. (born 1943)
- Donald Moffitt (born 1936)
- Elizabeth Moon (born 1945)
- Michael Moorcock (born 1939)
- Alan Moore (born 1953)
- C. L. Moore (1911–1987)
- Patrick Moore (born 1923)
- Ward Moore (1903–1978)
- Daniel Keys Moran (born 1962)
- Dan Morgan (born 1925)
- Richard Morgan (born 1965)
- Chris Moriarty (born 1968)
- Chris Morris (born 1946)
- Janet Morris (born 1946)
- William Morrison, (1906–1982) (pseudonym of Joseph Samachson)
- James Morrow (born 1947)
- Sam Moskowitz (1920–1997)
- Pat Murphy (born 1955)
Read more about this topic: List Of Science Fiction Authors