List of state leaders in 618

Africa

Chalukyas - Pulakesi II, Chalukya ruler (609–642)
China -
- Sui Dynasty
  1. Emperor Yang of Sui, Emperor of China (604–618)
  2. Emperor Gong of Sui, Emperor of China (617–618)
  3. Yang Hao, Emperor of China (618)
  4. Yang Tong, Emperor of China (618–619)
  - Emperor Yang was killed in coup. Coup leader Yuwen Huaji declares Emperor Yang's nephew Yang Hao emperor, then poisoned Yang Hao. Grand Chancellor Li Yuan deposes Emperor Gong, establishes Tang Dynasty. Officials at Luoyang declare Emperor Gong's brother Yang Tong emperor.
- Tang Dynasty - Gaozu (Li Yuan), Emperor of China (618–626)
Japan (Asuka Period) - Suiko, Empress of Japan (593–628)
Korea (Three Kingdoms) -
- Baekje - Mu, King of Baekje (600–641)
- Goguryeo -
  1. Yeongyang, King of Goguryeo (590–618)
  2. Yeongryu, King of Goguryeo (618–642)
- Silla - Jinpyeong, King of Silla (579–632)
Turkic Khaganate
- Eastern Turkic Khaganate
- Eastern Turkic Khaganate - Shibi Khan (609–619)
- Western Turkic Khaganate
1. Shekuei Khan, Khagan (611–618)
2. Tong Khan, Khagan (618–630)

Avars - Organa, Avar Khagan (617–630)
Byzantine Empire - Heraclius (610–641)
England (Heptarchy) - Raedwald of East Anglia, Bretwalda
- Kingdom of East Anglia - Raedwald of East Anglia (593–624)
- Kingdom of Essex - Sigeberht I (617–653)
- Kingdom of Kent - Eadbald (616–640)
- Northumbria - Edwin, King of Northumbria (616–632)
- Wessex - Cynegils, King of Wessex (611–643)
Frankish Empire - Clotaire II, King of the Franks (613–629)
Lombard Kingdom - Adaloald (616–626)
Scotland
- Dál Riata - Eochaid Buide, King of Dál Riata (608–629)
- Kingdom of Strathclyde - Neithon (617–621)
Visigothic Kingdom - Sisebur (612–621)
Wales -
- Kingdom of Gwynedd - Cadfan ap Iago (613-c.625)