Rasathi Varum Naal is a 1991 Indian Tamil-language horror film directed by Maniyan Sivabalan.
The film stars Nizhalgal Ravi, Kasthuri, and Balambika, with Nassar, Radha Ravi, Thyagu, and Rajeshkumar playing supporting roles.
Radha (Kasthuri) lives a luxurious life with her widower father Rajasekhar (Nassar) in a palace. She will marry the Inspector of Police Vijay (Nizhalgal Ravi) after finishing her studies.
During a college tour in Pachaimalai Hills, Radha is saved from a near-drowning experience by her college mates. She then finds a pendant in her pocket and brings it home.
Radha starts to have creepy nightmares in the night, and her pet dog dies in a mysterious way. One night, a spirit flees from the pendant and it enters into Radha's body.
The possessed spirit of the girl-victim Rasathi (Balambika) wants to take revenge for a gang-rape that happened 19 years ago; the tormentors were Rajasekhar (Nassar).
Rasathi Varum Naal was released on 13 December 1991.