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 M. Brown (Illinois politician), Illinois state senator William Mason Brown (1828–1898), American artist