Walter Samuel Millard (1864–1952) was a British entrepreneur and naturalist who was honorary secretary of the Bombay Natural History Society, editor of the Journal of the Bombay Natural History Society from 1906 to 1920, co-author (with Ethelbert Blatter) of the classic, Some Beautiful Indian Trees, and the driving force behind the Mammal Survey of the Indian subcontinent conducted by the society between 1911 and 1923.