20th-century regents

, known colloquially by his personal name was the 124th emperor of Japan according to the traditional order of succession, reigning from 1926 until his death in 1989. He remains the longest-reigning emperor in Japanese history and one of the longest-reigning monarchs in the world. As emperor during the Shōwa era, Hirohito presided over the rise of Japanese militarism, the Second Sino-Japanese War, the Asia-Pacific theater of World War II, and the nation's postwar economic miracle.

Spanish general and dictator (1892-1975)

Emperor of Ethiopia from 1930 to 1974

King of Saudi Arabia from 2005 to 2015

Chinese empress (1835–1908)

Finnish military leader and statesman (1867–1951)

King of Saudi Arabia from 1964 to 1975

Grand Duke (head of state) of the Grand Duchy of Luxembourg (2000–2025)

lieutenant of the Kingdom of Italy and last king of Italy

Regent of Hungary from 1920 to 1944 (1868-1957)

Thai prime minister (1900-1983)

king of Norway (1903-1991)

Queen of the Netherlands from 1948 to 1980 (1909-2004)

King of Denmark from 1947 to 1972

Prince regent of Kingdom of Serbia and later King of Yugoslavia 1921–34

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).

President of Finland (1861–1944)

Icelandic politician, 1st President of Iceland (1881-1952)

Queen consort of Spain (1858-1929)

Queen of the Hellenes (1851–1926)

Sultan of Terengganu

Ruler of Bavaria (1821–1912)

Regent of the Kingdom of Yugoslavia (1893-1976)

Grand Duchess consort and regent of Luxembourg (1861-1942)

prince, painter (1903-1983)

Regent and Crown Prince of Iraq (1913–1958)

raja of Perlis

Archduke of Austria (1872-1962)

Queen consort of Montenegro

Ntfombi Tfwala (also spelled Ntombi, born 27 December 1949) is Ndlovukati (Queen Mother) of Eswatini since 1983, as the mother and co-ruler of King Mswati III. She was also queen regent of Eswatini from 1983 until her son's accession in 1986.

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).

Qing Dynasty prince (1883-1951)

Chinese empress during the end of the Qing dynasty (1868-1913)

Prince of Lippe (1871–1949)

German general (1837–1906)

German monarch and explorer (1857–1920)

Regent of Lippe (1842-1904)

Grand Duchess consort of Hesse and by Rhine (1871–1937)

Jordanian prince (born 1947)

Queen regnant of Lesotho (1941–2003)

German prince (1858-1928)

German prince (1832-1913)

Cambodian politician (1909-1975)

Mantšebo (in full: '''Mantšebo Amelia 'Matšaba'''; 1902–1964) was the ruler of Basutoland (present-day Lesotho) from 1941 to 1960, as the regent for her stepson, the future Moshoeshoe II.

Crown Prince of Egypt and Sudan (1899-1979)

Prince of Siam (1863-1947)

Swazi royal regent

Inkhosikati LaShongwe (born Dzeliwe Shongwe; 1927 – 2003) was queen regent of Eswatini between 1982 and 1983. She was a wife of King Sobhuza II of Eswatini, and with him had one child, Prince Khuzulwandle Dlamini.

Egyptian prince (1875–1955)

Iranian politician (1863–1927)

younger son of King Abdullah I of Jordan (1914–1983)

Senior Maharani of Travancore and Regent of Travancore. (1895–1985)

Montenegrin diplomat, military and politician (1853-1935)

Wife of the Maharaja of Mysore

Regent of Thailand, (1885-1951)

Yazidi princess (1874–1957)

Regent of the BaNgwaketse, one of the eight ethnic groups of present-day Botswana, for four years (1924-1928)

Maharani of Cooch Behar

Queen of Tripura state and politician