Sir BN Rao was the Constitutional Advisor to the Constituent Assembly of India. Bengal Narsing Rao was an Indian bureaucrat, jurist, diplomat and statesman known for his key role in drafting the Constitution of India.

He was also India's representative to the United Nations Security Council from 1950 to 1952. BN Rau was appointed as the constitutional adviser to the Constituent Assembly in formulating the Indian Constitution. He was responsible for the general, structure of the democratic Constitution.