Udhay Avishek Karthik is an Indian actor who has appeared in Tamil language films. Closely associated with director Gautham Vasudev Menon, Karthik has worked previously as Menon's assistant in the films Pachaikili Muthucharam (2007) and Vaaranam Aayiram (2008), before making a breakthrough as an actor through the director's experimental thriller Nadunisi Naaygal (2011).

Early life
Karthik was born to a Telugu father from Tirupathi, Mohan Reddy and Tamil mother from Sivakasi, Suryakala. He is the brother of actress Maheswari and the nephew of veteran actress Sridevi.