List of state leaders in 420

See also
List of state leaders in 419 Events of 420 List of state leaders in 421 State leaders by year

This is a list of heads of state, government leaders, and other rulers in the year 420.

Asia

China (Sixteen Kingdoms)
- Eastern Jin - Emperor Gong, Emperor of Eastern Jin (419-420) (no successor)
- Liu Song - Emperor Wu, Emperor of Liu Song (420-422)
- Northern Liang - Juqu Mengxun, Prince of Northern Liang (401-433)
- Northern Wei - Emperor Mingyuan, Emperor of Northern Wei (409-423)
- Northern Yan - Feng Ba, Emperor of Northern Yan (409-430)
- Western Liang
  - Li Xin, Prince of Western Liang (417-420)
  - Li Xun, Prince of Western Liang (420-421)
- Xia - Helian Bobo, Emperor of Xia (407-425)
Gupta Empire - Kumaragupta I, Gupta Emperor of India (414-455)
Japan (Yamato period) - Ingyo, Emperor of Japan (c.411-c.453)
Korea (Three Kingdoms Period)
- Baekje
  - Jeonji, King of Baekje (405-420)
  - Guisin, King of Baekje (420-427)
- Gaya - Jwaji, King of Gaya (407-421)
- Goguryeo - Jangsu, King of Goguryeo (413-490)
- Silla - Nulji, King of Silla (417-458)

Georgia (Caucasian Iberia) - Archil, King of Iberia (411-435)
Vandals - Gunderic, King of the Vandals (407–428)
Visigoths - Theodoric, King of the Visigoths (419–451)
Galicians - Hermeric, King of Galicia (409-438)
Western Roman Empire - Honorius, Western Roman Emperor (395–423)