Thawan Thamrongnawasawat (also spelt Thawal Thamrongnavaswadhi or Thawal Thamrongnavasawat; Thai: ถวัลย์ ธำรงนาวาสวัสดิ์, IPA: [tʰà.wǎn tʰam.roŋ.naː.waː.sà.wàt]; Chinese: 郑连淡; pinyin: Zhèng Liándàn[3][4]); 21 November 1901 – 3 December 1988), also known by his noble title as Luang Thamrongnawasawat, was the eighth Prime Minister of Thailand from 1946–1947.

However, he was removed from office by a military coup orchestrated by Field Marshal Plaek Phibunsongkhram on 8 November 1947.

[5] After King Rama VII abdicated the throne, Thamrong was appointed by the government to be the leader of a faculty of representatives to travel to invite Prince Ananda Mahidol, who was living in Switzerland with his mother and two siblings, to ascend to the throne as King Rama VIII of the Chakri dynasty.

However, due to political fluctuations, a coup eventually occurred originating from within a group of soldiers led by Phin Choonhavan on 8 November 1947, resulting in Thamrong having to leave the country and stay in Hong Kong for a period.

Thawan Thamrongnawasawat died on 3 December 1988 at Phramongkutklao Hospital, aged 87 years, being the first and only naval officer to date who has served as prime minister.