List of state leaders in 640

This is a list of heads of state, government leaders, and other rulers in the year 640.

America

• Palenque (Mayas) – K'inich Janaab' Pakal (Pacal II the Great) (615–683)

Asia

• China (Tang dynasty) – Emperor Taizong (627–649)
• Japan (Asuka period) – Emperor Jomei (629–641)
• Korea (Three Kingdoms) -
  • Baekje – Mu (600–641)
  • Goguryeo – Yeongnyu (618–642)
  • Silla – Seondeok (632–647)
• Western Turkic Khaganate – Yukuk Shad (638–642)

Europe

• Byzantine Empire – Heraclius (610–641)
• England (Heptarchy) –
  • Kingdom of East Anglia – Anna of East Anglia (635–653)
  • Kingdom of Essex – Sigeberht the Little (617–653)
  • Kingdom of Kent –
    • Eadbald (616–640)
    • Eorcenberht (640–664)
  • Kingdom of Mercia – Penda (c. 626–655)
  • Kingdom of Northumbria – Oswald (634–642)
  • Kingdom of Sussex –
  • Kingdom of Wessex – Cynegils (611–643)
• Frankish Empire –
  • Austrasia – Sigebert III (634–656/660)
  • Neustria and Burgundy – Clovis II (639–655)
• Old Great Bulgaria – Kubrat (632–665)
• Lombard Kingdom – Rothari (636–652)
• Moravia – Samo, King of the Slavs (623–658)
• Scotland
  • Kingdom of Dál Riata – Domnall Brecc (629–642)
  • Kingdom of Strathclyde – Eugein I of Alt Clut (633–645)
• Visigothic Kingdom –
  • Chintila (636–640)
  • Tulga (640–642)
• Wales -
  • Kingdom of Gwynedd – Cadafael Cadomedd ap Cynfeddw (634–655)
  • Kingdom of Powys – Eiludd Powys (613–642?)

Middle East

• Rashidun Caliphate – Umar (634–644)
• Byzantine Empire – Heraclius (610–641)
• Sasanian Empire – Yazdegerd III (632–651)