Idhayam is a 1991 Indian Tamil-language romantic drama film directed by Kathir in his directorial debut.
The film stars Murali and Heera Rajagopal in her debut role, alongside Chinni Jayanth, Janagaraj, Manorama, and Vijayakumar in supporting roles.
The music was composed by Ilaiyaraaja. The story revolves around Raja, an introverted medical student who falls in love with his fellow college mate Geetha but does not express his love to her.
When he decides to convey his love, he misunderstands that Geetha is in love with someone else, but in fact, she was helping her sister and the latter's lover unite. Her father does not accept her sister's love, and the pair commits suicide.
On the last day of college, Raja finally conveys his love to Geetha when she is in the college mourning her sister's death. However, he learns that Geetha is about to be engaged soon to someone else, leaving him heartbroken.
The film was released on 6 September 1991.