List of state leaders in 1821
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Africa
- Egypt Viceroy Muhammad Ali Pasha (1805-1848)
- Ethiopia Kaiser: Joash II (1818-1821)
- Gigar (1821-1826, 1830)
- Burundi King: Ntare Rugamba IV (ca. 1796 -ca 1850. )
- Dahomey King: Gezo (1818-1856)
- Morocco ( Alawites Dynasty ) Sultan Moulay Sulaiman (1792-1822)
- Rwanda King: Mutara II (1802-1853)
- Tunisia ( Husainiden dynasty ): Sultan Mahmud Bey (1814-1824)
America
North America
- Mexico (disputed to 27 September ) Heads of State and Head of Government:?
- United States of America Heads of State and Head of Government: President James Monroe (1817-1825)
Central America
- Haiti ( disputed) Heads of State and Head of Government: President Jean -Pierre Boyer (1818-1843)
South America
- Brazil King John VI. (1816-1822) Regent Prince Peter
- Chile Heads of State and Head of Government: Supreme Director Bernardo O'Higgins (1817-1823)
- Gran Colombia Heads of state and head of government: President Francisco de Paula Santander (1819-1827, 1832-1837)
- Paraguay Heads of State and Head of Government: Consul Gaspar Rodríguez de Francia (1814-1840)
- Viceroyalty of Peru (from 28 July: Peru ) Heads of State and Head of Government: Protector José de San Martín (28 July 1821-1822 )
- Viceroy: Joaquín de la Pezuela (1816-1821)
- José de la Serna e Hinojosa (1821-1824)
- Río de la Plata (now Argentina) Heads of State and Head of Government: until 1826 no central government function, but only local juntas or caudillos
Asia
- Abu Dhabi Sheikh: Shakhbut 'm Dhiyab (1818-1833)
- 'm Tahnun Shakhbut (1818-1833)
- Afghanistan King: Ayub Shah (1819-1823)
- China ( Qing Dynasty ) Emperor Dao Guang (1821-1850)
- Japan Kaiser: Ninko (1817-1846)
- Shogun ( Tokugawa ): Tokugawa Ienari ( 1786-1837 )
- Korea ( Joseon ) King: Sunjo (1800-1834)
- Ottoman Empire Sultan Mahmud II (1808-1839)
- Persia ( Qajar dynasty ) Shah: Fath Ali (1797-1834)
- Thailand King Rama II (1809-1824)
Australasia
- Hawaii King Kamehameha II ( Liholiho ) ( 1819-1824 )
Europe
- Andorra Co - Prince: King of France: Louis XVIII. (1814-1824)
- Bishop of Urgell: Bernat Francés y Caballero (1817-1824)
- Denmark Ruler: King Frederick VI. (1808-1839)
- German Bund Austria Emperor Franz I. (1804-1835)
- King Friedrich Wilhelm III. (1797-1840)
- Duke: Alexius Friedrich Christian (1796-1834) until 1807 Prince
- Duke Leopold IV (1817-1871)
- Duke Ferdinand Friedrich (1818-1830)
- Grand Duke: Ludwig I (1818-1830)
- King Maximilian I. (1799-1825) until 1805 Elector
- Duke: Charles II (1815-1831)
- Mayor: George Groening (1814-1821)
- Mayor: Christian Hermann Beautiful (1817-1821)
- Mayor Arnold Dietrich Tidemann (1818-1821)
- Mayor: Johann Smidt (1821-1857)
- Mature Mayor: Johann Buchner (1821 )
- Mayor: William Amsinck (1802-1811) (1813-1831)
- Mayor: Johann Arnold Heise (1807-1811) (1813-1834)
- Mayor: Christian Matthias Schröder (1816-1821)
- Mayor: Johann Heinrich Bartels (1820-1850)
- Mayor: Johann Daniel Koch (1821-1829)
- King George IV (1820-1830)
- Grand Duke: Ludwig I (1790-1830) until 1806 Landgraf
- Landgrave Friedrich VI. (1820-1829)
- Elector: Wilhelm I (1785-1806) (1815-1821) until 1803 Landgraf
- Wilhelm II (1821-1847)
- Prince Friedrich (1810-1838)
- Prince Anton Aloys (1785-1831)
- Duke Friedrich VI. (1815-1839)
- Prince Johann I Joseph (1805-1836)
- Prince Leopold II (1802-1851)
- Mayor: Johann Caspar Lindenberg,
- Mayor: Johann Matthaeus Tesdorpf (1806 ) ( 1813-1824 )
- Mayor: Christian Adolph Overbeck (. 1814-25 January 1821 )
- Mayor: Stephan Hinrich Behncke
- Mayor Christian Heinrich Kindler
- Grand Duke: William I (1815-1840)
- Grand Duke Friedrich Franz I (1785-1837) until 1815 Duke
- Grand Duke: Georg (1816-1860)
- Duke: William I (1816-1839)
- Grand Duke Peter Friedrich Wilhelm (1785-1823) ( incapacitated under guardianship ) to 1815 Duke
- Prince Regent: Peter Friedrich Ludwig (1785-1810) (1815-1829) from 1823 Grand Duke
- Prince Heinrich XIX. (1817-1836)
- Prince Heinrich LI. (1797-1822) to 1806 Count
- Prince Heinrich LIV. (1805-1824)
- Prince Heinrich LXII. (1818-1848)
- King Friedrich August I (1763-1827) until 1806 Elector
- Duke Ernst I. (1806-1826)
- Duke: August (1804-1822)
- Duke Friedrich (1780-1826)
- Duke Bernhard II (1803-1866) under guardianship
- Regent: Louise Eleonore of Hohenlohe -Langenburg (1803-1822)
- Grand Duke Carl August (1758-1828) to 1815 Duke
- Prince Georg Wilhelm (1787-1860) to 1807 Count
- Prince Friedrich Günther (1807-1867)
- Prince Günther Friedrich Karl I (1794-1835)
- Prince: George II (1813-1845)
- King: William I (1816-1864)
- France King, Louis XVIII. (1814-1824)
- Italian States Church State Pope Pius VII (1800-1810) (1815-1823)
- King: Franz (1815-1835)
- Duchess Maria Luisa (1815-1824)
- Duchess Maria Beatrice (1790-1829)
- Duke: Franz IV (1814-1846)
- Duchess Marie- Louise (1814-1847)
- Captains Regent: Camillo Bonelli, Marino Berti (1 October 1820-1 April 1821. )
- Captains Regent: Antonio Onofri, Pier Vincenzo Giannini (1 April 1821-1 October 1821. )
- Captains Regent: Malpeli Giuliano, Pietro Berti (October 1, 1821-1822 )
- King Victor Emmanuel I (1802-1821)
- King, Charles Felix (1821-1831)
- King Ferdinand I (1816-1825)
- Grand Duke Ferdinand III. (1790-1801) (1814-1824)
- Krakow Mayor?
- Monaco Prince: Honoré V. (1819-1841)
- Montenegro ( until 1878 under Ottoman suzerainty ) Prince-bishop ( Vladika ): Petar I. Petrović - Njegoš ( 1782-1830 )
- Netherlands Ruler: King William I (1815-1840)
- Ottoman Empire Sultan Mahmud II (1808-1839)
- Portugal Ruler: King John VI. (1792-1826)
- Russia Tsar Alexander I. (1801-1825)
- Sweden and Norway Ruler: King Karl XIV Johan (1818-1844)
- Switzerland President of the Diet: David Wyss (1814-1815, 1821, 1827)
- Serbia ( until 1878 under Ottoman suzerainty ) Prince Miloš Obrenović (1817/30-1839) (1858-1860)
- Spain Ruler: King Ferdinand VII (1806-1808, 1813-1833)
- Hungary King Francis I (1792-1835)
- United Kingdom King George IV (1820-1830)
- Prime Minister: Robert Banks Jenkinson (1812-1827)