Kriangsak Chamanan (Thai: ???????????? ?????????, pronounced [kria??.sà k t??a.má(?).nan]; 17 December 1917 – 23 December 2003) served as prime minister of Thailand from 1977 to 1980.
After staging a successful coup, he was asked to become Prime Minister in 1977, he ruled till 1980 and is credited with "helping steer Thailand to democracy" in a time where internally, communist insurgents are rampant and neighbouring countries have turned to communist rule following the communist takeover of Vietnam: South Vietnam (by the Viet Cong), Laos (by the Pathet Lao), and Cambodia (by the Khmer Rouge).
He died on 23 December 2003, aged 86.
A professional soldier, in WWII he was posted in occupied Shan State.
He fought against the French in the Franco-Thai War from 1940–43, serving as platoon leader, and against the communists in both the Korean War and the Vietnam War.
In Korea, he served as Commander of Infantry Battalion III.