William Henry Dudley Le Souef (1856-1923) was a founding member and founding Secretary of the Royal Australasian Ornithologists Union (RAOU) in (1901), also serving as President of that body 1907-1909.
Le Souef was the son of Albert Alexander Cochrane Le Souef and brother of Ernest Albert Le Souef and Albert Sherbourne Le Souef.
Robin, Libby. (2001). The Flight of the Emu: a hundred years of Australian ornithology 1901-2001. Carlton, Vic. Melbourne University Press. ISBN 0-522-84987-3