1820 state leaders - Events of 1821 - 1822 state leaders - State leaders by year

Africa

• Ashanti Confederacy - Osei Bonsu, Asantehene (1804-1824)
• Buganda - Kamaya, King of Buganda (1814-1836)
• Bunyoro - Nyamutukura Kyebambe III, Omukama of Bunyoro (1786-1835)
• Burundi - Ntare IV Rugamba, King of Burundi (1796-1852)
• Dahomey - Gézo, King of Dahomey (1818-1856)
• Ethiopia -
  1. Iyoas II, Emperor of Ethiopia (1818-1821)
  2. Gigar, Emperor of Ethiopia (1821-1826, 1826-1830)
  • Shewa - Sahle Selassie, Negus (1813-1847)
• Ndzuwani - Abdallah bin Alawi, Sultan of Ndzuwani (1816-1832)
• Rwanda - Yuhi III, Mwami of Rwanda (1797-1830)
• Sokoto Caliphate
  • Caliph - Muhammed Bello, Sokoto Caliph (1814-1837)
  • Grand Vizier - Gidago dan Laima, Sokoto Grand Vizier (1817-1842)
• Swaziland - Paramount chief Ngwane IV (1815-1836)
• Zulu - Shaka, King of the Zulu (1816-1828)

Americas

• Chile - Bernardo O'Higgins, Supreme Director (1817-1823)
• Kingdom of Brazil (part of the United Kingdom of Portugal, Brazil, and the Algarve) - abolished in that year -
  • John VI, King (1815-1821)
  • D. Pedro de Alcântara, Prince Regent (1821)
• Mexico - Agustín de Iturbide, Head of Junta - Emperor (1821-1823)
• New Spain
  • Viceroys -
    1. Juan Ruiz de Apodaca (1816-1821)
    2. Francisco Novella Azabal Pérez y Sicardo (acting) (1821)
    3. Juan O'Donojú (1821)
• Paraguay - José Gaspar Rodríguez de Francia, Consul of Paraguay (1814-1840)
• Peru - José de San Martin, Protector of Peru (1821-1822)
• United States - James Monroe, President of the United States (1817-1825)

Asia

• Afghanistan -
  • Kabul/Peshawar - Ayub Shah, King of Afghanistan (1819-1823)
  • Kandahar - Shirdil Khan, Mohammedzay Regent (1818-1826)
  • Herat - Mahmud Shah, Padshah of Herat (1819-1826)
• China (Qing Dynasty) -
  1. Jiaqing, Emperor of China (1796-1820)
  2. Daoguang, Emperor of China (1821-1850)
• Japan
  • Monarch - Ninko, Emperor of Japan (1817-1846)
  • Shogun (Tokugawa) - Tokugawa Ienari, Shogun of Japan (1786-1837)
  • Ryūkyū Kingdom - Shō Kō, King of Ryūkyū (1804-1828)
• Korea (Joseon Dynasty) - Sunjo, King of Joseon (1800-1834)

Europe

• Abkhazia -
  1. Safar Begi, Prince of Abkhazia (1810-1821)
  2. Dimitri, Prince of Abkhazia (1821-1822)
• Andorra -
  • Bernat Francés y Caballero, Bishop of Urgell (1817-1824)
  • Louis XVIII, King of France (1815-1824)
• Denmark
  • Monarch - Frederick VI, King of Denmark (1808-1839)
  • Prime Minister - Heinrich Ernst, Minister of State of Denmark (1818-1824)
• France -
  • Monarch - Louis XVIII, King of France (1815-1824)
  • Prime Minister -
    1. Duc de Richelieu, Prime Minister of France (1820-1821)
    2. Comte de Villèle, Prime Minister of France (1821-1828)
• German Confederation
  • Austria - Francis I, Emperor of Austria (1792*-1835) *Note: Leader of Austria held the title of Archduke prior to 1804
    • Chancellor - Prince Klemens Wenzel von Metternich, Chancellor of Austria (1821-1848)
  • Bohemia - Francis, King of Bohemia (1792-1835)
  • Prussia -
    • Monarch - Friedrich Wilhelm III, King of Prussia (1797-1840)
    • Chief Minister - Prince Karl August von Hardenberg, Chief Minister of Prussia (1810-1822)
  • Bavaria - Maximilian I, King of Bavaria (1799*-1825) *Note: Leader of Bavaria held title of Elector prior to 1805
  • Saxony - Frederick Augustus I, King of Saxony 1763*-1827) *Note: Leader of Saxony held the title of Elector prior to 1806
  • Hanover - George IV, King of Hanover (1820-1830)
  • Württemberg - William, King of Württemberg (1816-1864)
  • Luxembourg - William I, Grand Duke of Luxembourg (1815-1840)
  • Liechtenstein - Johann Josef I, Prince of Liechtenstein (1805-1836)
• Hungary - Francis, King of Hungary (1792-1835)
• Moldavia -
  1. Mihai Grigore Suţu, Prince of Moldavia (1819-1821)
  2. Veniamin Costache, provisoral ruler (1821)
  3. Alexander Ypsilantis and the Filiki Eteria occupation (1821)
  4. Ştefan Vogoride, Caimacam (1821-1822)
• Moresnet
  • Monarchs -
    • William I, King of the Netherlands (1815-1840)
    • Friedrich Wilhelm III, King of Prussia (1797-1840)
  • Mayor - Arnold Timothée de Lasaulx, Mayor of Moresnet (1817-1859)
• United Kingdom of the Netherlands - William I, King of the Netherlands (1815-1840)
• Portugal - John VI, King of Portugal (1816-1826)
• Prussia -
  • Monarch - Friedrich Wilhelm III, King of Prussia (1797-1840)
  • Chief Minister - Karl August von Hardenberg, Chancellor of Prussia (1810-1822)
• Russia - Alexander I, Tsar of Russia (1801-1825)
• Spain - Ferdinand VII, King of Spain (1808, 1814-1833)
• Sweden - United Kingdoms of Sweden and Norway - Charles XIV John, King of Sweden (1818-1844)
• Two Sicilies - Ferdinand I, King of the Two Sicilies (1816-1825)
• United Kingdom
  • Monarch - George IV, King of the United Kingdom (1820-1830)
  • Prime Minister - Robert Banks Jenkinson, 2nd Earl of Liverpool, Prime Minister of the United Kingdom (1812-1827)
• Wallachia -
  1. Alexandru Suţu, Prince of Wallachia (1818-1821)
  2. Tudor Vladimirescu, military ruler (1821)
  3. Scarlat Callimachi, Prince of Wallachia (1821)

Middle East and North Africa

• Abu Dhabi -
  • Co-Shaikh - Shakhbut bin Dhiyab, Shaikh of Abu Dhabi (1818-1833)
  • Co-Shaikh - Tahnun bin Shakhbut, Shaikh of Abu Dhabi (1818-1833)
• Ajman - Rashid bin Humayd, Shaikh of Ajman (1816-1838)
• Bahrain - Shiekh Sulman ibn Ahmad Al Khalifah, Ruler of Bahrain (1796-1825)
• Egypt - Muhammad Ali Pasha, Governor of Egypt (1805-1848)
  • Kel Ahaggar - Ag Mama ag Sidi, Ruler of Kel Ahaggar (1790-1830)
• Kuwait - Sheikh Jabir ibn Abdullah Al Sabah, Ruler of Kuwait (1814-1859)
• Morocco - Slimane, Sultan of Morocco (1792-1822)
• Oman - Sa'id II ibn Sultan, Sultan of Oman (1804-1856)
• Ottoman Empire
  • Monarch - Mahmud II, Sultan of the Ottoman Empire (1808-1839)
  • Grand Vizier -
    1. Seyyid Ali Pasha, Ottoman Grand Vizier (1820-1821)
    2. Benderli Ali Pasha, Ottoman Grand Vizier (1821)
    3. Haci Salih Pasha, Ottoman Grand Vizier (1821-1822)
• Tunis (under Ottoman suzerainty) - Mahmud, Bey of Tunis (1814-1824)