•
Leonard Mackall (1879–1937; class of 1896), historian •
John Van Antwerp MacMurray (born 1881; class of 1898), diplomat •
Ricardo Maduro (born 1946; class of 1963), former
president of Honduras •
Reginald Marsh (1898–1954), painter •
Curtis McGraw (1895–1953), publisher and president of
McGraw-Hill 1950–1953 •
Donald C. McGraw (1897–1974; class of 1917), president of McGraw-Hill Companies •
James M. McIntosh (1828–1862; attended 1837–1840),
brigadier general in the
Confederate States Army •
Dennis Michie (1870–1898; class of 1888), first
football head coach at
Army, namesake of
Michie Stadium •
Clement Woodnutt Miller (1916–1962),
U.S. representative from
California •
Chi Modu (1966–2021), photographer known for his photos of various pioneering
hip-hop music entertainers •
Paul Moravec (born 1957), 2004
Pulitzer Prize for Music-winning composer •
Roland S. Morris (1874–1945), lawyer and diplomat; co-founded the law firm
Duane Morris in 1904;
U.S. ambassador to Japan 1917–1920 •
Geoff Morrell (class of 1987), former press secretary of the Department of Defense •
Paul Mott (born 1958), retired professional soccer player for the
Tampa Bay Rowdies, sports consultant and former professional sports executive •
Patrick Erin Murphy (born 1983; class of 2002), congressman (D-FL), representing Florida's 18th Congressional District ==N==