R. Sundarrajan is an Indian film director, actor, comedian and writer for Tamil language films. Active primarily in the 1980s and the 1990s as a filmmaker, he appeared more often as an actor thereafter. Sundarajan is known for his silver jubilee films such as Payanangal Mudivathillai (1982), Vaidehi Kathirunthal (1984), Rajadhi Raja (1989) and Thirumathi Palanisamy (1992). During his career as a director, he frequently collaborated with veteran actor Mohan.

Payanangal Mudivathillai is a 1982 Indian Tamil-language romantic drama film written and directed by R. Sundarrajan. The film stars Mohan and Poornima Jayaram, with Rajini, S. Ve. Shekher, Poornam Viswanathan, Rajesh and Goundamani in supporting roles. Its plot revolves around a woman who falls in love with a singer whom she helped to rise to fame but struggles to declare her love for him.