Thirumalai is a 2003 Indian Tamil-language masala film directed by Ramana and produced by Kavithalayaa Productions. The film stars Vijay and Jyothika, alongside Manoj K. Jayan, Avinash Yelandur, Vivek, Raghuvaran, Kausalya and Karunas. The music was composed by Vidyasagar, while cinematography and editing were handled by R. Rathnavelu and Suresh Urs.

Filming began in October 2002 and was planned for a January 2003 release, coinciding with Thai Pongal, along with Vijay's other film Vaseegara. Eventually, the delays due to the replacement of some actors and actresses caused the film to release in 24 October 2003, coinciding with Diwali.

Thirumalai became commercially successful at the box office by completing more than 100 days in theatres. The film became a turning point in Vijay's career as he transformed into an action hero from a romantic hero in his career. The film was remade in Telugu as Gowri in 2004. It was also remade in Bengali in 2007 as Kotha Dao Sathi Hobe starring Shakib Khan.