Howard Ensign Evans (February 23, 1919 – July 18, 2002) was an American entomologist who chiefly studied wasps.
Born in East Hartford, Connecticut, the son of Archie and Adella (Ensign) Evans, he developed an interest in natural history, and insects in particular, as a child on his parents' tobacco farm. He attended the University of Connecticut, and obtained his Ph.D. from Cornell University. During World War II, he served as an army parasitologist, doing pioneering work on the Giardia parasite while stationed in St. John's, Newfoundland. He held academic positions at Kansas State University, Cornell University, Harvard University and Colorado State University. Evans's passions included field biology, writing, teaching, the American West, backpacking, fishing, classical music, environmental conservation, and his family. Howard and Mary Alice Evans raised three children.
Numbered among his accomplishments in hymenopteran taxonomy was the novel family Scolebythidae in addition to 31 genera and almost 800 species. In addition to taxonomy, Evans produced important work on insect behavior and evolution.
A fellow at the National Academy of Sciences, he received a number of honors, including the William J. Walker Prize of the Boston Museum of Science (1967) and the Daniel Giraud Elliot Medal from the National Academy of Sciences (1976).