Thirumalai is a 2003 Indian Tamil-language masala film written and directed by Ramana. The film stars Vijay and Jyothika, with Manoj K. Jayan, Avinash (in his Tamil debut), Vivek, Raghuvaran, Kausalya and Karunas in supporting roles. Produced by Kavithalayaa Productions banner, filming began in May 2002 and was planned for a 2002 Christmas release, along with the Suriya starrer Mounam Pesiyadhe, but the delays due to the replacement of actors caused it to release in October 2003, coinciding with Diwali.

Thirumalai was declared as a blockbuster at the box office alongside positive reviews from critics. The film became a turning point in Vijay's career as he transitioned himself into a leading action hero from a romantic hero in his career.The film was remade in Telugu as Gowri with Sumanth and Charmme Kaur in 2004. It was also remade in Bengali in 2007 as Kotha Dao Sathi Hobe starring Shakib Khan and Apu Biswas.