William M. Brown may refer to:
- William M. Brown (Pennsylvania politician) (1850–1915), Republican political official from Pennsylvania
- William Brown (British Columbia politician) (1838–1915), English-born political figure in British Columbia
- William M. Brown (businessman), chief executive officer of 3M
- William Brown (baseball) (1866–1897), Major League Baseball player
- William Montgomery Brown (1855–1937), Episcopal clergyman and author
- William Brown (headmaster) (1914–2005), headmaster of King's Ely, and of Bedford School
- William Mason Brown (1828–1898), American artist
This disambiguation page lists articles about people with the same name.
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