Nandu (transl. Crab) is a 1981 Indian film written and directed by Mahendran. The film stars Ashwini and newcomer Suresh. It is based on the 1975 novel of the same name by Sivasankari. The film, primarily in Tamil, contains significant dialogue in Hindi due to the story being set in Lucknow, Uttar Pradesh. It was released on 17 April 1981, and failed commercially.