Udhayan () is a 2011 Indian Tamil-language action film directed by Chaplin and produced by Prabhakaran. The film stars Arulnithi (in dual roles) and Pranitha in her Tamil debut, with Santhanam in a supporting role. The film was released on 29 June 2011.
The film was launched on 17 January 2011. The film featured Arulnidhi in dual roles for first time.
The songs were composed by Manikanth Kadri in his Tamil debut. The lyrics were written by Vaali, Yugabharathi, Annamalai, Surya and Muthamil.
A critic from The New Indian Express noted "with a story-line that is oft-repeated and predictable, it's a passable entertainer". The Hindu wrote "Settling scores in a bloody fashion can get you nowhere says Udhayan (U/A). It has been said several times before but director Chaplin, a Pandiraj associate, who takes off on his own for the first time tries to impart the same with a storyline that juxtaposes sickle culture of the small town with the values of an average city household, thus keeping viewer interest alive". The film did not perform well at the box office.