Prince Sri Nagendra Singh (18 March 1914 – 11 December 1988) was an Indian lawyer and administrator who served as President of the International Court of Justice from 1985 to 1988.^[1] He was one of the four judges from India to have been Judges of the International Court of Justice in The Hague, the others being B. N. Rau (1952–1953), R. S. Pathak (1989–1991) the 18th Chief Justice of India, and Dalveer Bhandari (2012–), former Justice of the Supreme Court of India.^[2]

Nagendra Singh was born on 18 March 1914 in the State of the Kingdom of Dungarpur, to King Vijay Singh I and his wife Queen Davendra; his elder brother was Laxman Singh I, the last monarch of Dungarpur.^[3] Before joining the Civil Service he was educated at St John's College, Cambridge.^[4]

He joined the Indian Civil Service and served as Regional Commissioner for the Eastern States, a member of the Constituent Assembly of India, joint secretary for India's Defense Ministry, Director-General of Transport, and special secretary in the Ministry of Information and Broadcasting.^[5]

Between 1966 and 1972 Singh was secretary to the President of India,^[5] then from 1 October 1972 to 6 February 1973 he was Chief Election Commissioner of India.^[6] In 1966, 1969, and 1975, he was appointed a representative of India in the United Nations Assembly and served on the United Nations International Law Commission on a part-time basis from 1967 to 1972. He was also elected as secretary of the International Bar Association. In 1973, he moved to The Hague to become a judge of the International Court of Justice and was its president between February 1985 and February 1988, when he retired.^[5] He continued to live at the Hague and died there in December 1988.

Singh was awarded the Kama award in 1938, and in 1973 he received the Padma Vibhushan from the Government of India.^[7]