Mohana Sundaram is a 1951 Indian Tamil-language crime thriller film written and directed by A. T. Krishnaswamy.

An adaptation of J. R. Rangaraju's detective novel of the same name, the film stars T. R. Mahalingam and S. Varalakshmi.

It was released on 21 July 1951, and became an average success.

The soundtrack was composed by T. G. Lingappa and the lyrics were written by K. D.

[5] The westernised song "Hello My Dear Darling", which contained many English words, attracted considerable attention.