# List of youngest state leaders since 1900

This is a list of state leaders aged 30 or younger when they assumed office (since 1900). It does not include leaders who did not assume power in their own right, or leaders who served under colonial rule.

## Monarchs

| Name | State | Position | Born | Assumed office | At age | Notes |
| Fuad II | Egypt | King | 1952 | 1952 | 6 months | |
| Puyi | China | Emperor | 1906 | 1908 | 2 | |
| Gyanendra | Nepal | King | 1947 | 1950 | 3 | |
| Mwambutsa IV | Burundi | King | 1912 | 1915 | 3 | |
| Tenzin Gyatso | Tibet | Dalai Lama | 1935 | 1940 | 4 | |
| Michael I | Romania | King | 1921 | 1927 | 5 | |
| Simeon II | Bulgaria | Tsar | 1937 | 1943 | 6 | |
| Duy Tân | Vietnam | Emperor | 1900 | 1907 | 7 | |
| Ananda Mahidol | Thailand | King | 1925 | 1935 | 9 | Assumed power following a 10-year regency. |
| Ahmad Shah Qajar | Sublime State of Persia | Shah | 1898 | 1909 | 11 | Assumed power following a 5-year regency. |
| Hussein | Jordan | King | 1935 | 1952 | 16 | |
| Jigme Singye Wangchuck | Bhutan | King | 1955 | 1972 | 16 | |
| Alfonso XIII | Spain | King | 1886 | 1902 | 16 | Assumed power following a 16-year regency. |
| Tribhuvan | Nepal | King | 1906 | 1923 | 17 | Assumed power following a regency since 1911. |
| Farouk I | Egypt | King | 1920 | 1937 | 17 | Assumed power following a 1-year regency. |
| Marie-Adélaïde | Luxembourg | Grand Duchess | 1894 | 1912 | 17 | |
| Peter II | Yugoslavia | King | 1923 | 1941 | 17 | Assumed power following a 6-year regency. |
| Iyasu V | Ethiopia | Emperor | 1895 | 1913 | 18 | |
| Faisal II | Iraq | King | 1935 | 1953 | 18 | Assumed power following a 14-year regency. |
| Mswati III | Eswatini | King | 1968 | 1986 | 18 | Assumed power following a 3-year regency. |
| Manuel II | Portugal | King | 1889 | 1908 | 18 | |
| Michael I | Romania | King | 1921 | 1940 | 18 | Was previously King from 1927 to 1930 under a regency. |
| Bhumibol Adulyadej | Thailand | King | 1927 | 1946 | 18 | |
| Ntare V | Burundi | King | 1947 | 1966 | 18 | |
| Mohammad Zahir Shah | Afghanistan | King | 1914 | 1933 | 19 | |
| Norodom Sihanouk | Cambodia | King | 1922 | 1941 | 19 | |
| Baudouin | Belgium | King | 1930 | 1951 | 20 | Acted as regent for his father since 1950. |
| Mohammad Reza Pahlavi | Iran | Shah | 1919 | 1941 | 21 | |
| Hassanal Bolkiah | Brunei | Sultan | 1946 | 1967 | 21 | Reigning as Sultan since 1967. |
| Charlotte | Luxembourg | Grand Duchess | 1896 | 1919 | 22 | |
| Alexander | Greece | King | 1893 | 1917 | 23 | |
| Constantine II | Greece | King | 1940 | 1964 | 23 | |
| Boris III | Bulgaria | Tsar | 1894 | 1918 | 24 | |
| Jigme Dorji Wangchuck | Bhutan | King | 1928 | 1952 | 24 | |
| Hirohito | Japan | Emperor | 1901 | 1926 | 25 | Acted as regent for his father since 1921. |
| Rainier III | Monaco | Prince | 1923 | 1949 | 25 | |
| Elizabeth II | United Kingdom Canada Australia New Zealand South Africa Pakistan Ceylon | Queen | 1926 | 1952 | 25 | |
| Jigme Khesar Namgyel Wangchuck | Bhutan | King | 1980 | 2006 | 26 | |
| Amanullah Khan | Afghanistan | Emir | 1892 | 1919 | 26 | |
| Moshoeshoe II | Lesotho | King | 1938 | 1965 | 26 | Ruled as Paramount Chief under colonial rule since 1960. |
| Birendra | Nepal | King | 1945 | 1972 | 26 | |
| Carl XVI Gustaf | Sweden | King | 1946 | 1973 | 27 | |
| Letsie III | Lesotho | King | 1963 | 1990 | 27 | |
| Vajiravudh | Siam | King | 1881 | 1910 | 29 | |
| Karl I | Austria-Hungary | Emperor | 1887 | 1916 | 29 | |
| Qaboos bin Said | Oman | Sultan | 1940 | 1970 | 29 | |
| Dipendra | Nepal | King | 1971 | 2001 | 29 | |
| Vittorio Emanuele III | Italy | King | 1869 | 1900 | 30 | |
| Elizabeth II | Ghana | Queen | 1926 | 1957 | 30 | |

## Non-royal leaders

| Name | State | Position | Born | Assumed office | At age | Notes |
| Jean-Claude Duvalier | Haiti | President | 1951 | 1971 | 19 | Became president after his father's death. |
| Navaandorjiin Jadambaa | Mongolia | Chairman of the Presidium | 1900 | 1924 | 24 | |
| Valentine Strasser | Sierra Leone | President | 1967 | 1992 | 25 | |
| Michel Micombero | Burundi | Prime Minister | 1940 | 1966 | 25 | Later became President in 1966 at 26. |
| Puyi | Manchukuo | Chief Executive | 1906 | 1932 | 26 | |
| Maria Lea Pedini-Angelini | San Marino | Captain Regent | 1954 | 1981 | 26 | |
| Enzo Colombini | San Marino | Captain Regent | 1958 | 1985 | 26 | |
| Giacomo Simoncini | San Marino | Captain Regent | 1994 | 2021 | 26 | |
| Ahmet Zogu | Albania | Prime Minister | 1895 | 1922 | 27 | Prime minister and President at 29. Became King of Albania in 1928 at 32. |
| Muammar Gaddafi | Libya | Brotherly Leader and Guide of the Revolution | 1942 | 1969 | 27 | |
| Gloriana Ranocchini | San Marino | Captain Regent | 1957 | 1984 | 27 | |
| Giovanni Lonfernini | San Marino | Captain Regent | 1976 | 2003 | 27 | |
| Abdessalam Jalloud | Libya | Prime Minister | 1944 | 1972 | 27 | |
| Andrea Zafferani | San Marino | Captain Regent | 1982 | 2010 | 27 | |
| Matteo Ciacci | San Marino | Captain Regent | 1990 | 2018 | 27 | |
| Khertek Anchimaa-Toka | Tuva | Chair of the Presidium | 1912 | 1940 | 28 | |
| Sheikh Maktoum bin Rashid Al Maktoum | United Arab Emirates | Prime Minister | 1943 | 1971 | 28 | |
| Vanessa D'Ambrosio | San Marino | Captain Regent | 1988 | 2017 | 28 | |
| Alexander Chervyakov | Belarusian SSR | Prime Minister | 1892 | 1920 | 28 | |
| Mario Frick | Liechtenstein | Prime Minister | 1965 | 1993 | 28 | |
| Kim Jong-un | North Korea | General Secretary Chairman Supreme Commander | 1983 | 2011 | 28 | Became Supreme leader of North Korea after his father's death. |
| Giuliano Gozi | San Marino | Captain Regent | 1894 | 1923 | 28 | |
| Samuel Doe | Liberia | President | 1951 | 1980 | 28 | |
| Ieremia Tabai | Kiribati | President | 1949 | 1979 | 29 | Served as colonial Chief Minister since 1978. |
| Jamtsangiin Damdinsüren | Mongolia | Chairman of the Presidium | 1898 | 1927 | 29 | |
| Lhendup Dorji | Bhutan | Prime Minister | 1935 | 1964 | 29 | |
| Muhammad Ali Haitham | South Yemen | Prime Minister | 1940 | 1969 | 29 | |
| Milo Đukanović | Montenegro | Prime Minister | 1962 | 1991 | 29 | |
| Yahya Jammeh | The Gambia | President | 1965 | 1994 | 29 | |
| Souley Abdoulaye | Niger | Prime Minister | 1965 | 1994 | 29 | |
| Roque González Garza | Mexico | President | 1885 | 1915 | 29 | |
| Gnassingbé Eyadéma | Togo | President | 1937 | 1967 | 29 | |
| Branko Crvenkovski | Macedonia | Prime Minister | 1962 | 1992 | 29 | |
| Joseph Kabila | Democratic Republic of the Congo | President | 1971 | 2001 | 29 | |
| Alessandro Cardelli | San Marino | Captain Regent | 1991 | 2020 | 29 | |
| Muhammad Ahmad al-Mangoush | Libya | Prime Minister | 1967 | 1997 | 30 | |
| David Dacko | Central African Republic | President | 1930 | 1960 | 30 | Served as colonial Prime Minister since 1959. |
| Jean-Baptiste Bagaza | Burundi | President | 1946 | 1976 | 30 | |
| Bernard Dowiyogo | Nauru | President | 1946 | 1976 | 30 | |
| Ilir Meta | Albania | Prime Minister | 1969 | 1999 | 30 | |
| Sadiq al-Mahdi | Sudan | Prime Minister | 1935 | 1966 | 30 | |
| Marien Ngouabi | Republic of the Congo | President | 1938 | 1969 | 30 | |
| Pandeli Majko | Albania | Prime Minister | 1967 | 1998 | 30 | |