Mystics in Bali (Indonesian: Mistik (Punahnya Rahasia Ilmu Iblis Leak)), also released as Leák and Balinese Mystic, is a 1981 Indonesian supernatural horror film directed by Tjut Djalil. Based on the novel Leák Ngakak by Putra Mada, the film stars Ilona Agathe Bastian, Yos Santo, Sofia W.D., and W.D. Mochtar.

Mystics in Bali follows an anthropologist named Cathy (Bastian) who travels to Bali to research black magic, eventually becoming the disciple of a witch and transforming into a bloodthirsty disembodied head, with her organs and entrails hanging from her neck. The film borrows elements from Southeast Asian folklore and Balinese mythology, including the Leyak and the penanggalan, entities which have in common that they take the form of flying heads with innards still attached. The film has been called a cult classic of Indonesian horror cinema.