1666 state leaders - Events of 1667 - 1668 state leaders - State leaders by year

Africa

• Dahomey - Houegbadja, King of Dahomey (1645-1685)
• Ethiopia -
  1. Fasilides, Emperor of Ethiopia (1632-1667)
  2. Yohannes I, Emperor of Ethiopia (1667-1682)

Asia

• China (Qing Dynasty) - Kangxi, Emperor of China (1662-1722)
• Japan -
  • Monarch - Reigen, Emperor of Japan (1663-1687)
  • Shogun (Tokugawa) - Tokugawa Ietsuna, Shogun of Japan (1651-1680)
  • Ryūkyū Kingdom -
    • Monarch - Shō Shitsu, King of Ryūkyū (1648-1668)
    • Regent - Shō Shōken, Sessei (1666-1673)
• Korea (Joseon Dynasty) - Hyeonjong, King of Joseon (1659-1674)
• Mughal Empire - Aurangzeb, Mughal Emperor (1658 - 1707)
• Taiwan (Dongning) - Zheng Jing, Ruler of Dongning (1662-1681)

Europe

• England - Charles II, King of England (1660-1685)
• France - Louis XIV, King of France (1643-1715)
• Polish-Lithuanian Commonwealth - Jan II Kazimierz Vasa, King of Poland (1648-1668)
• Savoy - Charles Emmanuel II, Duke of Savoy (1638-1675)
• United Provinces
  • Estates of Friesland, Groningen, Guelders, Holland, Overijssel, Utrecht, Zeeland (1581-1795)
  • Grand Pensionary of Holland - Johan de Witt (1653-1672)