Sathru  is an upcoming 2019 Indian Tamil language action thriller film written and directed by Naveen Nanjundan on his directorial debut.  The film stars Kathir, Srushti Dange  in the lead roles while Neelima Rani, Suja Varunee, Ponvannan  play supportive roles.

The film will be released on 8 March 2019. Following the success of Pariyerum Perumal, actor Kathir decided to shift his acting career into a commercial flick for the first time by signing to act in an action thriller film directed by debutant Naveen Nanjundan in around 2018 with the actor agreed to have portrayed the role of a police cop for the first time in his career through this project.

The official teaser of the film was launched by actor Jayam Ravi  on 5 January 2019.  The official trailer of the film was unveiled by director Atlee Kumar  on 22 February 2019.

The film was earlier planned for a theatrical release in around February 2019 but was postponed to have its release on 1 March 2019 due to tight race on the box office.  The film was later confirmed to hit the screens on 8 March 2019.