Ramanathan Sarathkumar is an Indian film actor, journalist, politician, former president of the South Indian Artistes' Association, and former bodybuilder. Sarathkumar has appeared in more than 130 Tamil, Malayalam, Telugu, and Kannada films. He is fluent in Tamil, Telugu, Malayalam, Kannada, and English.

In 1986, Sarathkumar began his acting career in the Telugu film Samajamlo Stri. He initially played negative roles and later supporting roles before establishing himself as a leading actor in the following years, earning the title "Supreme Star" in Tamil cinema. He has received two Tamil Nadu State Film Awards and three Filmfare Awards South.

In 2007, he founded a new political party, the All India Samathuva Makkal Katchi (AISMK), in Tamil Nadu, stating his intention to embody the ideals of K. Kamaraj. He is a former member of the Legislative Assembly for Tenkasi constituency. From 2006 to 2015, he served three consecutive terms as president of Nadigar Sangam.