1620 state leaders - Events of 1621 - 1622 state leaders - State leaders by year

Africa

• Dahomey - Dakodonou, King of Dahomey (1620-1645)
• Ethiopia - Susenyos, Emperor of Ethiopia (1606-1632)

Asia

• China (Ming Dynasty) - Tianqi, Emperor of China (1620-1627)
• Japan
  • Monarch - Go-Mizunoo, Emperor of Japan (1611-1629)
  • Shogun (Tokugawa) - Tokugawa Hidetada, Shogun of Japan (1605-1623)
  • Ryūkyū Kingdom - Shō Hō, King of Ryūkyū (1621-1640)
• Korea (Joseon Dynasty) - Gwanghaegun, King of Joseon (1608-1623)
• Later Jin (Manchu Empire) - Nurhaci, Emperor of Later Jin (1616-1626)
• Mughal Empire - Jahangir, Mughal Emperor (1605-1627)

Europe

• Denmark–Norway - Christian IV, King of Denmark (1588-1648)
• England - James I, King of England (1603-1625)
• France - Louis XIII, King of France (1610-1643)
• Holy Roman Empire - Ferdinand II, Holy Roman Emperor (1619-1637)
• Papal States -
  • Paul V, Pope (1605-1621)
  • Gregory XV, Pope (1621-1623)
• Polish-Lithuanian Commonwealth - Sigismund III Vasa, King of Poland (1587-1632)
• Russia - Michael I, Tsar of Russia (1613-1645)
• Spain -
  1. Philip III, King of Spain (1598-1621)
  2. Philip IV, King of Spain (1621-1665)
• Sweden - Gustavus Adolphus, King of Sweden (1611-1632)
• United Provinces
  • Estates of Friesland, Groningen, Guelders, Holland, Overijssel, Utrecht, Zeeland (1581-1795)
  • Stadtholder - Maurice of Nassau, Prince of Orange, Stadtholder of Gelre, Holland, Utrecht and Zeeland (1585 - 1625)
    • Holland - Grand Pensionary -
      1. Andries de Witt (1619-1621)
      2. Anthonie Duyck (1621-1629)

Middle East and North Africa

• Ottoman Empire - Osman II, Sultan of the Ottoman Empire (1618-1622)
• Safavid Empire - Abbas I Shah of Iran (1587-1629)