Jagat Singh Mehta (17 July 1922 – 6 March 2014) was an Indian politician and diplomat who was Foreign Secretary of India from 1976 to 1979.

He served as a teacher in the Allahabad University and as an officer in the Indian Navy before joining the IFS.

[4] He had a meteoric rise when he and TAT Lodhi informed the government of British India of imminent mutiny in the Indian Navy which resulted in the trial and execution of naval officers, based on Mehta-Lodhi testimonies.

He was the Tom Slick Professor for World Peace at the Lyndon B. Johnson School of Public Affairs, the University of Texas at Austin, from 1983-1985.

His publications include: Militarization in the Third World (1985); The March of Folly in Afghanistan (2002); and Negotiating for India (2006).