Nagercoil Sudalaimuthu Krishnan, popularly known as Kalaivanar and also as 'NSK' was a leading Nagercoil Tamil film comedian, drama artist, playback singer and writer in the early stages of the Tamil film industry – in the 1940s and 1950s. He is considered as the "Charlie Chaplin of India".
Born in Ozhuginachery, Nagercoil, in the princely state of Travancore, India on 29 November 1908, his stage and cine-screen comedy performances were unique and always carried a message for the people. 'Kalaivanar' N. S. Krishnan died at the age of 49, on 30 August 1957.