Thawan Thamrongnawasawat (also spelt Thawal Thamrongnavaswadhi or Thawal Thamrongnavasawat; Thai: ?????? ???????????????, IPA: [t?à .wan t?am.ro?.na?.wa?.sà .wà t]; Chinese: ???; pinyin: Zhèng Liándà n), born Thawan Tharisawat (Thai: ?????? ???????????, IPA: [t?à .wan t?a?.ri?.sà .wà t]; 21 November 1901 – 3 December 1988), was the eighth Prime Minister of Thailand from 1946-1947.
Before becoming a politician, he was a naval officer, holding the rank of rear admiral.
A career naval officer of Chinese ancestry, Thamrong was a leading member of the anti-Japanese Free Thai Movement resistance movement during World War II.
He became Thailand's elected prime minister on 23 August 1946, replacing Pridi Banomyong.
However, he was removed from office by a military coup orchestrated by Field Marshal Plaek Phibunsongkhram on 8 November 1947.
Abhaiwongse then assumed the post of prime minister.