Elvio Herbert Sadun (December 9, 1918 – April 23, 1974) was an Italian-American parasitologist.
Educated at Harvard and Johns Hopkins University (ScD, zoology), he conducted most of his research as Chief of Medical Zoology at the Walter Reed Army Institute of Research (1959–1973).
A prolific scientist, he wrote or edited 3 books and 313 peer-reviewed articles in the fields of immunology and tropical medicine, and is known for the first application of fluorescent antibody imaging in the diagnosis of parasitic diseases.