William Steuart may refer to:
Scotland William Steuart (British Army officer) (1643–1726), Scottish general William Steuart (Scottish politician) (1686–1768), Scottish lawyer, member of parliament 1713–41
Maryland William Frederick Steuart 1816–1889 (1816–1889), Confederate surgeon William Steuart (Mayor of Baltimore) (1754–1838), mayor of Baltimore William Steuart (planter) (1754–1838), Maryland planter
See also Billy Steuart (born 1936), South African swimmer William Stewart (disambiguation) William Stuart (disambiguation)