Natesan Rangabashyam (1936–2013), popularly known NR, was an Indian surgical gastroenterologist and medical academic, known for his pioneering efforts in the fields of surgical gastroenterology and proctology in India. He was known to have established the department of Surgical Gastroenterology at Madras Medical College and introduced the first MCh course in Surgical Gastroenterology in India. A former honorary surgeon to the President of India, he received B. C. Roy Award, the highest Indian award in the medical category, twice. The Government of India awarded him the third highest civilian honour of the Padma Bhushan, in 2002, for his contributions to medical science.