Mounam Sammadham is a 1990 Indian Tamil-language legal thriller film written by S. N. Swamy, directed by K. Madhu and produced by Kovai Chezhiyan. The film stars Mammootty and Amala. It revolves around a lawyer representing a wrongfully convicted man.

The legal thriller genre is a type of crime fiction genre that focuses on the proceedings of the investigation, with particular reference to the impacts on courtroom proceedings and the lives of characters.