List of state leaders in 1820

This is a list of heads of state, government leaders, and other rulers in the year 1820.

Africa

• Ashanti Confederacy – Osei Bonsu, Asantehene (1804–1824)
• Kingdom of Buganda – Kamaanya (1814–1836)
• Bunyoro – Nyamutukura Kyebambe III, Omukama of Bunyoro (1786–1835)
• Kingdom of Burundi – Ntare IV Rugamba (1796–1852)
• Kingdom of Dahomey – Gézo (1818–1856)
• Ethiopian Empire – Iyoas II (1818–1821)
• Griquatown – Andries Waterboer, Captain
  • Shewa – Sahle Selassie, Negus (1813–1847)
• Sokoto Caliphate
  • Caliph – Muhammed Bello (1814–1837)
  • Grand Vizier – Gidago dan Laima (1817–1842)
• Sultanate of Ndzuwani – Abdallah bin Alawi (1816–1832)
• Kingdom of Rwanda – Yuhi III (1797–1830)
• Kingdom of 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 Algarves) - John VI (1815–1821)
• Gran Colombia - Simón Bolívar, President of Gran Colombia (1819–1830)
• Haiti – Jean-Pierre Boyer, President of Haiti (1818–1843)
• Paraguay – José Gaspar Rodríguez de Francia, Consul of Paraguay (1814–1840)
• United Provinces of the Río de la Plata
  1. José Rondeau, Supreme Director (1819–1820)
  2. Juan Pedro Aguirre, Supreme Director (1820)
• United States - James Monroe, President of the United States (1817–1825)

Asia

• Afghanistan –
  • Kabul/Peshawar - Ayub Shah Durrani (1819–1823)
  • Kandahar - Shirdil Khan, Mohammedzay Regent (1818–1826)
  • Herat - Mahmud Shah Durrani, Padshah of Herat (1819–1826)
• Ahom kingdom – Sudingphaa (1818–1821)
• China (Qing dynasty) -
  • 1. Jiaqing Emperor (1796–1820)
    2. Daoguang Emperor (1820–1850)
• Empire of Japan
  • Monarch – Emperor Ninkō (1817–1846)
  • Tokugawa shogunate - Tokugawa Ienari (1786–1837)
  • Ryukyu Kingdom - Shō Kō (1804–1828)
• Korea (Joseon dynasty) – Sunjo (1800–1834)
• Persia – Fat′h-Ali Shah Qajar, Qajar dynasty (1797–1834)
• Siam – Rama II, Chakri Dynasty (1809–1824)
• Sikh Empire (Punjab) - Ranjit Singh, Maharaja (1801–1839)
• Đại Việt – Gia Long, Emperor (1762–1820)

Europe

• Principality of Abkhazia – Safar Begi (1810–1821)
• Andorra –
  • Bernat Francés y Caballero, Bishop of Urgell (1817–1824)
  • Louis XVIII of France (1815–1824)
• Kingdom of Denmark
  • Monarch – Frederick VI (1808–1839)
  • Prime Minister – Ernst Heinrich von Schimmelmann (1818–1824)
• Kingdom of France –
  • Monarch – Louis XVIII (1815–1824)
  • Prime Minister -
    1. Comte Decazes (1819–1820)
    2. Armand-Emmanuel de Vignerot du Plessis, Duc de Richelieu (1820–1821)
• German Confederation
  • Austrian Empire – Francis I (1792*-1835) *Note: Leader of Austria held the title of Archduke prior to 1804
  • Kingdom of Bohemia – Francis (1792–1835)
  • Kingdom of Prussia –
    • Monarch – Friedrich Wilhelm III (1797–1840)
    • Chief Minister – Prince Karl August von Hardenberg (1810–1822)
  • Kingdom of Bavaria – Maximilian I (1799*-1825) *Note: Leader of Bavaria held title of Elector prior to 1805
  • Kingdom of Saxony – Frederick Augustus I (1763*-1827) *Note: Leader of Saxony held the title of Elector prior to 1806
  • Kingdom of Hanover –
    1. George III (1814–1820)
    2. George IV (1820–1830)
    • Duchy of Bremen –
      1. George III of the United Kingdom (House of Hanover) (1760–1820, dispossessed from 1803 to 1813)
      2. George IV of the United Kingdom (House of Hanover) (1820–1823, title had turned void, Duchy incorporated in real union into Kingdom of Hanover in 1823)
    • Principality of Verden –
      1. George III of the United Kingdom (House of Hanover) (1760–1820, dispossessed from 1803 to 1813)
      2. George IV of the United Kingdom (House of Hanover) (1820–1823, title had turned void, Principality incorporated in real union into Kingdom of Hanover 1823)
  • Kingdom of Württemberg – William (1816–1864)
  • Grand Duchy of Luxembourg – William I (1815–1840)
  • Principality of Liechtenstein – Johann Josef I (1805–1836)
• Kingdom of Hungary – Francis (1792–1835)
• Neutral Moresnet
  • Monarchs -
    • William I of the Netherlands (1815–1840)
    • Frederick William III of Prussia (1797–1840)
  • Mayor - Arnold Timothée de Lasaulx, Mayor of Moresnet (1817–1859)
• United Kingdom of the Netherlands – William I (1815–1840)
• Ottoman Empire
  • Sultan - Mahmud II (1808–1839)
  • Grand Vizier -
    1. Dervis Mehmed Pasha (1818–1820)
    2. Seyyid Ali Pasha (1820–1821)
• United Kingdom of Portugal, Brazil and the Algarves – John VI (1816–1826)
• Russian Empire – Alexander I (1801–1825)
• Kingdom of Spain – Ferdinand VII (1808, 1814–1833)
• Kingdom of Sweden – United Kingdoms of Sweden and Norway - Charles XIV John (1818–1844)
• Grand Duchy of Tuscany – Ferdinand III (1814–1824)
• Kingdom of the Two Sicilies – Ferdinand I (1816–1825)
• United Kingdom of Great Britain and Ireland
  • Monarch -
    1. George III (1760–1820)
    2. George IV (1820–1830)
  • Regent -
    1. The Prince of Wales (1811–1820)
    2. became King
  • Prime Minister – Robert Jenkinson, 2nd Earl of Liverpool (1812–1827)

Middle East and North Africa

• Abu Dhabi –
  • Co-Shaikh – Shakhbut bin Dhiyab Al Nahyan (1818–1833)
  • Co-Shaikh – Tahnun bin Shakhbut Al Nahyan (1818–1833)
• Ajman – Rashid bin Humayd, Shaikh of Ajman (1816–1838)
• Bahrain – Sheikh Salman ibn Ahmad Al-Khalifa (1796–1825)
• Egypt Eyalet – Muhammad Ali Pasha, Governor of Egypt (1805–1848)
  • Kel Ahaggar – Ag Mama ag Sidi (1790–1830)
• Kuwait – Sheikh Jabir ibn Abdullah Al Sabah (1814–1859)
• Lebanon – Bashir ibn al-Qasim ibn Umar, Emir of Lebanon (1801–1821)
• Sultanate of Morocco – Slimane (1792–1822)
• Sultanate of Oman – Said bin Sultan (1804–1856)
• Persia (Qajar dynasty) – Fat′h-Ali Shah Qajar (1797–1834)
• Beylik of Tunis (under Ottoman Empire suzerainty) - Mahmud, Tunis (1814–1824)