Mukut Mithi (born 1 January 1954) is an Indian politician from the state of Arunachal Pradesh who is the incumbent Member of the Rajya Sabha. He is a former Chief Minister of Arunachal Pradesh. He served as an MLA consecutively from 1983 until his appointment as Lieutenant Governor of Puducherry in 2006. He was Chief Minister of Arunachal Pradesh from January 19, 1999 until August 3, 2003.

He was born on 1st January 1954 at Roing in Lower Dibang Valley district in Arunachal Pradesh and did his schooling from Ramakrishna Mission School, Narendrapur and his graduation from J.N.Agricultural University, Jabalpur. For much of his political career he was a member of the Indian National Congress and then the Arunachal Congress; he later broke from the Arunachal Congress in 1998 to form the Arunachal Congress-Mithi. Later Arunachal Congress-Mithi merged with Congress. He also held The Pradesh Congress Committee President Post and also served as Congress working Committee, Permanent Member Of the Indian National Congress.

In July 2006 the President of India appointed Mithi to be the Lieutenant Governor of Puducherry; he was sworn in on July 19, 2006. He is the youngest politician to be appointed to a gubernatorial role, which clearly speaks loudly of his credibility in the Congress Party to which he belongs.

On March 12, 2008, Mithi resigned as Lieutenant Governor in order to stand in the Rajya Sabha election in Arunachal Pradesh. Bhopinder Singh, the Lieutenant Governor of the Andaman and Nicobar Islands, was sworn in to replace Mithi on March 15. He was administered oath as a member of Parliament (Rajya sabha)from Arunachal Pradesh on 4/06/08.

He resides at Anakum, Ezengo, P.O.&P.S. – Roing, Lower Dibang Valley District, Arunachal Pradesh. He is married to Shrimati Pomaya Mithi and has three sons.