List of state leaders in 378

See also
List of state leaders in 377 Events of 378 List of state leaders in 379 State leaders by year

This is a list of heads of state, government leaders, and other rulers in the year 378.

Africa

Ethiopia (Aksumite Empire) - Mehadeyis or Ouazebas (precise dates uncertain)

China (Sixteen Kingdoms Period)
- Eastern Jin Dynasty - Emperor Xiaowu, Emperor of China (372-396)
- Former Qin - Fú Jiān, Emperor of Former Qin (357-385)
India
- Gupta Empire - Chandragupta II (c.350-415)
- Kadamba Dynasty - Kangavarma (365-390)
- Kidarite Kingdom - Grumbat (c358-c380)
- Vakataka - Prithvisena I (355-380)
- Western Satraps - Rudrasena III (348-380)
Indonesia (Tarumanagara) - Rajadirajaguru Jayasingawarman (358-382)
Japan - Nintoku (313-399)
Korea (Three Kingdoms Period)
- Baekje - Geungusu, King of Baekje (375-384)
- Goguryeo - Sosurim, King of Goguryeo (371-384)
- Silla - Naemul, King of Silla (356-402)
Sri Lanka - Upatissa I (370-412)

Armenia
1. Varasdates (Varazdat), King of Armenia (374-378)
2. Arsaces III (Arshak III), King of Armenia (378–387) with Vologases III (Vagharsh III), King of Armenia (378-386)
Georgia (Caucasian Iberia) - Mihrdat III (c365-380)
Germany (Thervingi)
1. Athanaric (died 381)
2. Fritigern
Western Roman Empire -
1. Gratian, Roman Emperor (375-383)
2. Valentinian II, Roman Emperor (375-392)