Sattam Oru Iruttarai is a 1981 Indian Tamil-language vigilante action film written and directed by S. A. Chandrasekhar, based on a story by his wife Shoba.
The film stars Vijayakanth in the lead role alongside Poornima Devi and Vasumathi, with Sangili Murugan, Nithin, and Chowdry in supporting roles.
The plot revolves around Vijay's quest to kill three men in revenge for the murder of his father and elder sister. His younger sister, who is a police inspector, attempts to bring her brother's actions against the law through official channels.
The film was released on 14 February 1981 and achieved significant commercial success, inspiring more Tamil films with themes about the law system that were mostly directed by Chandrasekhar.