Aalavandhan (Tamil: ஆளவந்தான்) is a Indian Tamil Thriller film released in 2001. Directed by Suresh Krishna, it stars Kamal Haasan in a dual role, with Raveena Tandon and Manisha Koirala as his love interests. The film's soundtrack was composed by Shankar-Ehsaan-Loy and the background score by late Mahesh Mahadevan. Actor Jayam Ravi served as an assistant director for this film.

This movie was simultaneously released in Telugu and Hindi as Abhay. The film is an adaptation of a novel titled Dayam that was written by Kamal Haasan in 1984.,

Vijay (Kamal Haasan) is the commander of an anti-terrorist squad. He gets engaged to Tejaswini (Raveena Tandon) who is pregnant with their child. Vijay's brother Nandu (also played by Haasan) is psychotic and is in a mental asylum. Vijay takes Tejaswini to the asylum so that Nandu can meet her. In his delusions, Nandu decides that she is his evil stepmother. Nandu, who killed his stepmother when he was twelve, decides that he must kill Tejaswini to protect Vijay.