Iltis
Iltis may refer to:
 Ana S. Iltis, a philosophy professor at Wake Forest College 
 Fred Iltis (1923-2008), an entomologist at San Jose State University, son of Hugo Iltis
 Hugh Iltis (1925-2016), a botanist at the University of Wisconsin–Madison, son of Hugo Iltis
 Hugo Iltis (1882-1952), a Czech-American biologist and professor at Mary Washington College

See also
 Delias iltis, a butterfly
 German torpedo boat Iltis, a 1920s German ship
 SMS Iltis, a late 1800s German gunboat
 Volkswagen Iltis, a military vehicle