T. K. S. Elangovan (Tamil: தி.கோ.சீ இளங்கோவன்) (born 30 August 1954 in Thanjavur, Tamil Nadu, India) is a member of parliament in India. He is also the Organisation Secretary of DMK. He is the son of Late TK Srinivasan also popularly known as Thathuva Medhai TK Srinivasan (Ex Rajya Sabha MP).
He was actively participating in politics since school days. He became the Organisation Secretary of DMK after quitting his job. He was elected Member of Parliament in May 2009.
In June 2016, he was announced as the party's candidate for the Rajya Sabha biennial polls. On 3 June 2016 he was elected unopposed along with R. S. Bharathi.
Elangovan is the one of the eldest son of Thathuva Medhai TK Srinivasan and Saraswathi Srinivasan. He moved to Chennai in 1962 with his family. After completing his post graduation he went to USA to continue his studies. He later came back to India and worked in Indian Overseas Bank, where he met his wife M G Nalini, who happened to be his colleague and got married on 23 January 1984.