William M. Brown

William M. Brown may refer to:
 * William M. Brown (Pennsylvania politician) (1850–1915), Republican political official from Pennsylvania
 * William Brown (British Columbia politician) (1838– after 1882), English-born political figure in British Columbia
 * William M. Brown (businessman), chief executive officer and chairman of L3Harris Technologies
 * 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