William R. Allen is the name of: William R. Allen (economist) (1924–2021), American economist, professor and author William Allen (Canadian politician) (1919–1985) William Allen (Montana politician) (1871–1953), American politician and businessman William Allen (Utah architect) (1849–1928) William Reginald Allen (English cricketer) (1893–1950) William Rodney Allen, American author and former professor of English