Atheis (literally Atheist, also known as Kafir) is a 1974 Indonesian film directed by Sjumandjaja and adapted from Achdiat Karta Mihardja's novel of the same name. It follows a young Muslim man named Hasan who, through his interactions with others, loses his faith.

Shot on a budget of Rp. 80 million and starring Deddy Sutomo, Emmy Salim, Kusno Sudjarwadi, and Farouk Afero, Atheis was intended to be a challenge to Indonesia's religious communities. It was controversial upon release, at one point being refused by the country's censorship bureau. A box-office failure upon release, the film has since become one of Sjumandjaja's best known.