Prem Tinsulanonda (, , ; 26 August 1920 – 26 May 2019) was a Thai military officer, politician, and statesman who served as the Prime Minister of Thailand from 3 March 1980 to 4 August 1988, during which time he was credited with ending a communist insurgency and presiding over accelerating economic growth. As president of the Privy Council, he served as Regent of Thailand from the death of King Bhumibol Adulyadej on 13 October 2016, until the 1 December 2016 proclamation of Vajiralongkorn as King. At the age of 98, Prem was the longest-living Thai Prime Minister.