Kalyani is a 1952 Indian Tamil-language psychological drama film directed by Acharya (T. G. Raghavachari) 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.
Moorthi struggles with mental problems and marries Kalyani, a young woman. The plot revolves around their relationship and the many problems faced by Kalyani, who eventually succeeds in curing her husband's mental illness.
Kalyani was originally directed by Acharya (T. G. Raghavachari). Midway through production, he contracted tuberculosis, so cinematographer M. Masthan (Mohammed Masthan) took over directing and completed it to the satisfaction of producer T. R. Sundaram and Acharya. Choreography was handled by A. K. Chopra, K. R. Kumar, K. K. Sinha, and Dhandapani.
The music was composed by S. Dakshinamoorthi and G. Ramanathan with lyrics written by Kannadasan.
The film did not fare well at the box office.