Mästlin,
Michael Marius,
Simon Maskelyne,
Nevil Maury,
Antonia Caetana de Paiva Pereira Mayer,
Christian Mayer,
Johann Tobias McCrae,
John McCrea,
William Hunter Menzel,
Donald Howard Mercator,
Gerardus Messier,
Charles Milne,
Edward Arthur Minkowski,
Rudolph Leo