Kaadhal Kondein (transl. I Fell In Love) is a 2003 Indian Tamil-language romantic psychological thriller film written and directed by Selvaraghavan, credited as his directorial debut. The film stars his brother Dhanush and newcomers Sonia Agarwal and Sudeep Sarangi, while Nagesh and Daniel Balaji play supporting roles. The film, which has music scored by Yuvan Shankar Raja and cinematography handled by Aravind Krishna, released on 4 July 2003, becoming a critical and commercial success upon release. The film is considered a breakthrough for Dhanush as it catapulted him into the league of lead actors in the Tamil film industry.

The film was remade in Telugu in 2004 as Nenu, in Bangla in 2004 as Onno Manush, in Kannada in 2009 as Ravana and in Bengali in 2010 as Amanush.