Thommayanti (Thai: ทมยันตี) is the pen name of Khun Ying Wimon Chiamcharoen (Thai: วิมล เจียมเจริญ), who was born 10 July 1937, as Wimon Siriphaibun (Thai: วิมล ศิริไพบูลย์, also Wimol Siripaiboon). She is a Thai novelist and has been a legislator several times in her career.
Among her works is the historical fantasy romance novel, Thawiphop, about a woman who time travels from the 20th century to Rama V-era Siam. The story was first adapted as a film by Cherd Songsri in 1990, and has since been adapted as a stage play, a musical, a television series, and a 2004 film (Siam Renaissance).
Another of Thommayanti's works is Khu Kam, about the romance of a Thai woman and a Japanese soldier during World War II in Thailand. It has been adapted into two films, Sunset at Chaophraya (in 1996 and 2013), a stage musical, and a television series. Another of her famous works is Dang Duang Haruethai.
Apart from her writing ability, she is a noted orator. On several occasions Wimon gave public speeches in favour of the military. During the coup d'état in the 6 October 1976 Massacre, Wimon played important role in the "housewife society", a group of wives of military generals. She also made public speeches against the students who agitated for democratic reform, saying that the students were destroying Thailand's good relationship with the United States. In that event, students were mass murdered and Wimon was appointed by the junta that took control of the country as a legislator and member of the National Reform Council. Later in 1979, Wimon was elected as a senator.
In 1986, the Supreme Court of Justice found Wimon, while serving as a senator, guilty of having committed adultery with Group Captain Akhom Atthawetworawut (นาวาอากาศเอก อาคม อรรถเวทย์วรวุฒิ), an officer who was also a senator, after Police Major Siwit Chiamcharoen (พันตำรวจตรี ศรีวิทย์ เจียมเจริญ), her husband, filed divorce proceedings and a claim for compensation. After the Supreme Court's judgment, the Senate resolved to dismiss Wimon from senatorial office.
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- บุญร่วม เทียมจันทร์. (2529). รวมคำพิพากษาฎีกาคดีดัง. กรุงเทพฯ : จงเจริญการพิมพ์. หน้า 336-355.
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