S. Rajasekar (19 August 1957 – 8 September 2019) was an Indian cinematographer, film director, and actor. He collaborated with director Robert under the name Robert–Rajasekar.

Career
Rajasekar's first break happened with Kudisai, followed by Oru Thalai Ragam as he worked as cinematographer along with Robert Ashirwatham. Bharathiraja's Nizhalgal provided him the break as a lead actor. He has co-directed many successful films along with Robert Ashirwatham as a director duo known as Robert–Rajasekar.

Later, he acted in many TV serials, notably Thendral, Saravanan Meenatchi, Valli, and Sathya. His role in Saravanan Meenatchi was liked by many, as he portrayed a comedic, friendly dad with ease. This made him a recognizable face among the new generation audience.

Personal life
Rajasekar married Tara Begam in 1990. The couple had no children.

Death
On 8 September 2019, Rajasekar died of an illness while he was getting treated at Ramachandra Hospital in Chennai. He was 62 years old, and a resident of Valasaravakkam, Chennai.