Gunaa is a 1991 Indian Tamil-language psychological romantic drama film directed by Santhana Bharathi and co-written by Sab John. The film stars Kamal Haasan, Rekha and newcomer Roshini. It revolves around a newly released psychiatric patient (Haasan) who kidnaps an heiress (Roshini) to make her fall in love with him. He believes she is an avatar of goddess Abhirami and it is his destiny to marry her.

Haasan and John initially planned to make a film set in Sri Lanka during a time of insurgency, but the project was dropped over story concerns. John later developed the story of Gunaa, inspired partly by a mentally-ill person he knew. The dialogues were written by Balakumaran, cinematography was handled by Venu and editing by B. Lenin and V. T. Vijayan. The film was mostly shot around Kodaikanal, including a cave then known as Devil's Kitchen.

Gunaa was released on 5 November 1991, Diwali day. It was critically acclaimed for its unique theme and performances, but had an average run at the box office. The film won a Tamil Nadu State Film Award, a Filmfare Award, and two Cinema Express Awards. It acquired cult status in Tamil cinema and inspired similar films about mentally obsessed lovers, while Devil's Kitchen became a popular tourist spot after the film's release and later known as "Guna Caves".