Mahanadhi is a 1994 Indian Tamil-language crime drama film directed by Santhana Bharathi and co-written by Kamal Haasan. The film stars Haasan and Sukanya, with S. N. Lakshmi, Tulasi, Shobana Vignesh, Dinesh, Poornam Viswanathan, Rajesh and V. M. C. Haneefa in supporting roles. It revolves around a widower and his family going through many miseries due to the machinations of a con artist.

Santhana Bharathi is an Indian film director and actor who has primarily worked in Tamil cinema. He directed Gunaa (1991), which won third prize for the Tamil Nadu State Film Award for Best Film. He also directed Mahanadhi (1994), which won the National Film Award for Best Feature Film in Tamil and the Tamil Nadu State Film Award Special Prize.