S. C. Krishnan (1929-1983) was an Indian actor and playback singer who worked mainly in Tamil dramas and films.

Kalyani is a 1952 Indian Tamil-language psychological drama film directed by Acharya and M. Masthan, and produced by T. R. Sundaram of Modern Theatres. The film portrays the life of a mentally-deranged man and is heavily inspired by 1948 American film The Snake Pit. It was later remade in Telugu as Atthainti Kaapuram in 1952. Kalyani stars M. N. Nambiar. B. S. Saroja, D. Balasubramaniam, M. G. Chakrapani and T. P. Muthulakshmi had supporting roles.