Regents of Thailand

Thai prime minister (1900-1983)

former Regent of Thailand (1920-2019)

Vajiravudh (1 January 188126 November 1925) was the sixth king of Siam from the Chakri dynasty, titled Rama VI. He reigned from 1910 until his death in 1925. King Vajiravudh is best known for his efforts to create and promote Siamese nationalism. His reign was characterized by Siam's further Westernization, minimal participation in World War I, and lavish spending on arts and culture. He had keen interests in Siamese history, archaeology, and literature, as well as economics, politics and world affairs, and founded the country's first university, Chulalongkorn University.

Sirikit (born Mom Rajawongse Sirikit Kitiyakara; 12 August 1932 – 24 October 2025) was Queen of Thailand from 28 April 1950 to 13 October 2016 as the wife of King Bhumibol Adulyadej (Rama IX).

Srinagarindra (; ; 21 October 1900 – 18 July 1995) born Sangwan Talapat (; ) was a member of the Royal Thai Family. She was part of the House of Mahidol, which is descended from the Chakri dynasty and was founded by Prince Mahidol Adulyadej. She was the mother of Princess Galyani Vadhana, King Ananda Mahidol (Rama VIII), and King Bhumibol Adulyadej (Rama IX) and was the paternal grandmother of King Vajiralongkorn (Rama X).

Queen Consort of Siam (1864–1919)

Prince of Siam (1863-1947)

Regent of Thailand

Regent of Thailand, (1885-1951)

Exercises monarchical functions in their absence or interregnum

Nobleman of Siam