List of state leaders in 644

This is a list of heads of state, government leaders, and other rulers in the year 644.

America

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

Asia

• China (Tang dynasty) – Emperor Taizong (627–649)
• Japan (Asuka period) – Empress Kogyoku (642–645)
• Korea (Three Kingdoms) -
  • Baekje – Uija (641–660)
  • Goguryeo – Bojang (642–668)
  • Silla – Seondeok (632–647)
• Western Turkic Khaganate – Irbis Seguy (642–651)

Europe

• Byzantine Empire – Constans II (641–668)
• England (Heptarchy) – Oswiu of Northumbria, Bretwalda
  • Kingdom of East Anglia – Anna of East Anglia (635–653)
  • Kingdom of Essex – Sigeberht the Little (617–653)
  • Kingdom of Kent – Eorcenberht (640–664)
  • Kingdom of Mercia – Penda (c. 626–655)
  • Kingdom of Northumbria –
    • Bernicia – Oswiu (642–670)
    • Deira – Oswine of Deira (642–651)
  • Kingdom of Sussex –
  • Kingdom of Wessex – Cenwalh (643–674)
• 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 – Ferchar mac Connaid (642–650)
  • Kingdom of Strathclyde – Eugein I of Alt Clut (633–645)
• Visigothic Kingdom – Chindasuinth (642–653)
• Wales -
  • Kingdom of Gwynedd – Cadafael Cadomedd ap Cynfeddw (634–655)
  • Kingdom of Powys

Middle East

• Rashidun Caliphate
  • Umar ibn al-Khattab (634–644)
  • Uthman ibn Affan (644–656)
• Byzantine Empire – Constans II (641–668)
• Sasanian Empire – Yazdegerd III (632–651)