M-Q
- John D. MacDonald (1916–1986)
- Marianne Macdonald (born 1934)
- Philip MacDonald (1900–1980)
- Ross Macdonald (1915–1983)
- Charlotte MacLeod (1922–2005)
- Michael Mallory (born 1955)
- Margaret Maron
- Ngaio Marsh
- Edward Marston (pseudonym of Keith Miles)
- Lee Martin
- Rosemary Martin
- Sujata Massey
- Seicho Matsumoto
- Peter May - Writer (born 1951)
- James McClure (born 1939)
- Sharyn McCrumb (born 1948)
- Val McDermid
- Gregory McDonald (born 1937)
- Michael McGarrity
- Jean Henry Mead
- Zygmunt Miłoszewski
- Gladys Mitchell (1901–1983)
- Kirk Mitchell
- Miyuki Miyabe
- Christopher G. Moore, (born 1952)
- Colonel Robert Morris, (born 1954)
- John Mortimer (1923–2009)
- Marcia Muller
- Margaret Murphy
- Beverle Graves Myers (born 1951)
- Tim Myers
- Michael P. Naughton
- Phyllis Reynolds Naylor
- Katherine Neville
- Kyotaro Nishimura
- Joyce Carol Oates
- T. Lynn Ocean
- Baroness Orczy (1865–1947)
- Brian O'Hara
- Kido Okamoto
- Otsuichi
- Sara Paretsky (born 1947)
- Barbara Parker (1946/1947-2009)
- Robert B. Parker (1932–2010)
- Hayford Peirce (born 1942)
- Louise Penny (born 1958)
- Elizabeth Peters (born 1927), (pseudonym of Barbara Mertz)
- Ellis Peters (1913–1995), (pseudonym of Edith Pargeter)
- Nancy Pickard (born 1945)
- Edgar Allan Poe (1809–1849) The Murders in the Rue Morgue
- Martha Powers
- Bill Pronzini (born 1943)
- Ellery Queen, also wrote as Barnaby Ross
- Patrick Quentin (pseudonym for Hugh Wheeler and Richard Wilson Webb), also wrote as Quentin Patrick and Jonathan Stagge
- Qiu Xiaolong
- Edward Qiu
- Radine Trees Nehring
Read more about this topic: List Of Mystery Writers