List of state leaders in 321

See also
List of state leaders in 320 Events of 321 List of state leaders in 322 State leaders by year

This is a list of heads of state, government leaders, and other rulers in the year 321.

Asia

Armenia - Tiridates III, King of Armenia (287–330)
China (Sixteen Kingdoms Period)
- Eastern Jin Dynasty - Emperor Yuan, Emperor of China (317–323)
- Han Zhao - Liu Yao, Emperor of Han Zhao (318-329)
- Later Zhao - Shi Le, Emperor of Later Zhao (319-333)
- Cheng Han - Li Xiong, Emperor of Cheng Han (303-334)
- Former Liang - Zhang Mao, Emperor of Former Liang (320-324)
Gupta Empire - Chandragupta I, Gupta Ruler (319–335)
Japan - (Ancient period) - Emperor Nintoku, emperor of Japan (c.313-c.399 traditional dates)
Korea (Three Kingdoms Period)
- Baekje - Biryu, King of Baekje (304–344)
- Goguryeo - Micheon, King of Goguryeo (300–331)
- Silla - Heulhae, King of Silla (310–356)
Kushan Empire - Chhu, Emperor of the Kushans (c.310–325)
Pallava - Simha Varman I, King of Pallava (315–345)