Oru Kaidhiyin Diary is a 1985 Indian Tamil-language action thriller film directed by Bharathiraja and co-written by K. Bhagyaraj.
The film stars Kamal Haasan, Radha, and Revathi, and was released on January 14, 1985.
David, the protagonist, is a prisoner who devises a plan to take revenge on those responsible for his wife's death after she is raped by a politician. The film follows David's journey as he navigates his way through prison and ultimately seeks justice.
The movie was remade in Hindi as Aakhree Raasta (1986) and in Telugu as Marana Homam (1987). It completed a 175-day run in theatres, becoming a silver jubilee film.
