Paramasivan is a 2006 Indian Tamil-language action thriller film written and directed by P. Vasu and produced by S. Ramesh Babu.

[1] The film stars Ajith Kumar in the main lead role alongside Jayaram, Laila, Vivek and Prakash Raj.

He decides to employ unconventional methods to fulfill his mission and engages Siva to assist him, renaming him Paramasivan, changing his look (cutting his Jaṭā hair), and giving him a single-point agenda – trace out and erase the people responsible for the Coimbatore blasts.

The fly in the ointment is played by CBI officer Nair, who is out to trace Paramasivan and stop his unlawful activities.

[3] The project was initially taken up by director Bala's production house, B Studios, and was titled Idi (Thunder), with Laila selected to play the leading female role.

[10] The film was released on 14 January 2006 on the eve of Pongal along with Vijay's Aathi and Simbu's Saravana.