Arunachalam is a 1997 Indian Tamil-language masala film directed by Sundar C. and written by Crazy Mohan. The film stars Rajinikanth, Soundarya and Rambha, with Jaishankar, Ravichandran and Visu in supporting roles. It revolves around a village simpleton, who later discovers he is the heir of a deceased billionaire, but must go to great lengths to claim his father's inheritance.

Vinayagar Sundar Vel, known professionally as Sundar C., is an Indian film director, writer, actor and producer who works in Tamil cinema. He has directed over 30 films and received the Kalaimamani award.