|Language Worked in||Telugu, Tamil|
|Birth Place||Tamil Nadu, India|
|Education||St. Bede's Anglo Indian Higher Secondary School, Chennai. He gained a Bach|
|Favourite Cuisine||South Indian|
|Favourite Color||White, Pink|
Karthi (born Karthik Sivakumar on 25 May 1977) is an Indian film actor, who works in the Tamil film industry. The youngest son of actor Sivakumar, Karthi holds a Bachelor's degree in Mechanical Engineering and a Master's degree in Industrial Engineering. Since he had always wanted to become a film director, he returned to India and joined Mani Ratnam as an assistant director. He was offered acting roles and made his acting debut in Paruthiveeran in 2007 as the titular character, a careless village rowdy, winning critical acclaim and several accolades including the Filmfare Award for Best Actor and a Tamil Nadu State Film Award.
His next role was that of a coolie in Aayirathil Oruvan (2010), a fantasy-adventure film directed by Selvaraghavan. He achieved consecutive commercial successes with his subsequent releases – Paiyaa (2010), Naan Mahaan Alla (2010) and Siruthai (2011) which established him in the Tamil film industry.
Karthi has been involved in several charities and social service activities. On his 31st birthday, he inaugurated the Makkal Nala Mandram, in order to encourage his fans to become involved in welfare activities.
During the event, Karthi donated blood, donated bicycles to handicapped people, sewing machines to women and schoolbags to children. He presented a cheque of ₹ 50,000 to YRG Care Centre, which helps AIDS affected children.In 2011, Karthi became a cause ambassador for promoting awareness of lysosomal storage disease.
He had also adopted a white tiger cub at Vandalur Zoo and contributed 72,000 to protect and preserve the animal.On his birthdays, Karthi visits orphanages and donates funds to them.
He told Indiaglitz; "When I see people in need, I make sure I go and help. If I am going on birthdays to reach out to kids in orphanages, it is for my own satisfaction. I feel happier to be with them and it's nice to make them smile on that particular day.
Karthi was born to Sivakumar and his wife Lakshmi. Sivakumar is a veteran Tamil actor who has appeared in approximately 200 films. He has two siblings; an elder brother, Suriya, also a leading actor in the Tamil film industry, and a younger sister named Brindha.
Former leading Tamil film actress, Jyothika Sadanah is Karthi's sister–in–law. On 3 July 2011, Karthi married Ranjani Chinnasamy, who graduated with a Masters degree in English literature from Stella Maris College, Chennai.They were engaged on 29 April 2011 at Ranjani's native village, Goundampalayam in Erode District, and the wedding was held at the CODISSIA trade fair complex in Coimbatore.The wedding was arranged by the elders of the family.They were blessed with a baby girl on 11 Jan 2013.