Dilip Sinha, writer and former diplomat, joined the Indian Foreign Service in 1978. He was India's ambassador to the United Nations in Geneva and earlier to Greece. He served in India’s missions in Islamabad, Dhaka, Cairo, Bonn and Brasilia and was head of the United Nations and the Pakistan-Afghanistan-Iran divisions in the Ministry of External Affairs. He worked in the Prime Minister's Office during the term of Prime Minister P.V. Narasimha Rao.

He was also Chairman of the Manipur Public Service Commission.

He has authored two books:

 (i)Legitimacy of Power – The Permanence of Five in the Security Council, published by the Indian Council of World Affairs. 

  (ii)Imperial Games in Tibet – The Struggle for Statehood and Sovereignty, published by Pan Macmillan.