Karthik Sivakumar (born 25 May 1979), best known by his stage name Karthi is a Tamil film actor. He is the younger son of veteran actor Sivakumar and brother of Surya Sivakumar and best known for his critically acclaimed performance as the titular character in his debut film Paruthiveeran in 2007, for which he received the Filmfare Award for Best Actor.
