Ratchagan is a 1997 Indian Tamil-language romantic action film directed by Praveen Gandhi in his directoral debut.
The music and background score was composed by A. R. Rahman, with the film starring Nagarjuna and Sushmita Sen in their Tamil debuts, alongside Raghuvaran, S. P. Balasubrahmanyam, Vadivelu, and Girish Karnad in supporting roles.
Ajay is an unemployed youth who takes the law into his own hands when he encounters anyone committing a crime. His father tries to change his behavior through various means.
The film was released on 30 October 1997 and was the most expensive Indian film at the time of release, with Sushmita Sen being in a lead role for the first time in a Tamil film.