William Malet may refer to:
William Malet (companion of William the Conqueror) (died 1071), Norman lord who fought in the Battle of Hastings William Malet (exile) (died c. 1121), Norman lord who forfeited his English lands and was banished from England William Malet (Magna Carta baron) (fl. 1195–1215), guarantor of Magna Carta
See also Billy Mallett, Coronation Street character