Siruthai (transl. Cheetah) is a 2011 Indian Tamil-language action film written and directed by Siva. It is a remake of the 2006 Telugu film Vikramarkudu, directed by S. S. Rajamouli. It stars Karthi playing dual roles, alongside Tamannaah and comedian Santhanam. The film was produced by K. E. Gnanavelraja and features music by Vidyasagar. The story revolves around "Rocket" Raja, a petty thief who comes across a little girl says that he's her father. When he learns the truth about his lookalike Rathnavel Pandian, who's an honest cop, he decides to turn a new leaf and help get rid of a crime gang.

It was released during Pongal on 14 January 2011. Generally the film got positive responses, the film was a success at the box office.