Iltis may refer to:
People Ana S. Iltis, American philosophy professor at Wake Forest College Fred Iltis (1923–2008), American entomologist at San Jose State University, son of Hugo Iltis Hugh Iltis (1925–2016), American botanist at the University of Wisconsin–Madison, son of Hugo Iltis Hugo Iltis (1882–1952), Czech-American biologist and professor at Mary Washington College
Military German torpedo boat Iltis, a 1920s German ship , several ships of the Imperial German navy Volkswagen Iltis, a military vehicle
Other Delias iltis, a butterfly