Mangai Oru Gangai is a 1987 Indian Tamil-language legal drama film directed by T. Hariharan and produced by Kovaithambi.

Radha Ranganathan, an advocate, becomes cynical after failing to get a criminal convicted for the murder of her brother-in-law.

Mangai Oru Gangai was directed by T. Hariharan and produced by Kovaithambi of Motherland Pictures.

[4] On 7 August, N. Krishnaswamy of The Indian Express wrote, "I was pleased that the makers of the film had done their homework on the script and had here something that was intellectually simulating", and praised the performances of Saritha, Charan Raj, Nadhiya and Viswanathan.

[5] Jayamanmadhan of Kalki, however, reviewed the film more negatively, feeling the court scenes were excessively stretched and inducing uncontrollable yawn.