Mangai Oru Gangai is a 1987 Indian Tamil-language legal drama film directed by T. Hariharan and produced by Kovaithambi.
The film stars Saritha and Nadhiya, and follows Radha Ranganathan, an advocate who becomes cynical after failing to get a criminal convicted for the murder of her brother-in-law.
The screenplay was written by T. Hariharan, based on a story by Motherland Pictures' Story Department, with dialogue written by M. G. Vallabhan. Cinematography was handled by U. Rajagopal, and editing by M. S. Money.
The soundtrack was composed by the duo Laxmikant–Pyarelal.
Mangai Oru Gangai was released on 24 July 1987.
