Naalai Unathu Naal (transl. Tomorrow is your day) is a 1984 Indian Tamil-language mystery thriller film, written and directed by A. Jagannathan. The film stars Vijayakanth, Nalini and Jaishankar. It is a remake of the Hindi film Gumnaam (1965), itself heavily inspired by Agatha Christie's novel And Then There Were None (1939). The film is about a group of people being murdered one by one while on a free vacation. It was released on 7 September 1984, and performed averagely at the box office.