Brigadier William Harry Evans CSI CIE DSO (born 22 July 1876 in Shillong – died 13 November 1956, Church Whitfield ) was a lepidopterist and British Army officer who served in India. He documented the butterfly fauna of India, Burma and Ceylon in a series of articles in the Journal of the Bombay Natural History Society. Brigadier Evans was especially interested in the taxonomy and systematics of the butterfly families Lycaenidae and Hesperiidae an example being his A revision of the Arhopala group of Oriental Lycaenidae (Lepidoptera: Rhopalocera) Bull. British Mus. (Nat. Hist.), Ent., vol. 5: pp. 85–141 (1957).