List of state leaders in 178

See also
List of state leaders in 177 Events of 178 List of state leaders in 179 State leaders by year

This is a list of heads of state, government leaders, and other rulers in the year 178.

Africa

China – Ling, Emperor of China (168–189)
Korea (Three Kingdoms Period)
- Baekje – Chogo, King of Baekje (166–214)
- Goguryeo – Sindae, King of Goguryeo (165–179)
- Silla – Adalla, King of Silla (154–184)

Armenia
- Sohaemus, King of Armenia (163–186)
Athens
- Scribonius Capiton, Archon of Athens (177–178)
- Flavius Stratolaus Phylasius, Archon of Athens (178–179)
Bosporan Kingdom – Tiberius Julius Sauromates II, Roman client King of Bosporus (174–211)
Caucasian Iberia – Pharsman III, King of Caucasian Iberia (145–185)
Ireland – Art mac Cuinn, High King of Ireland (165–195)
Marcomanni – Ballomar, King of the Marcomanni (166–178)
Roman Empire (Principate – Nervan-Antonian dynasty)
- Marcus Aurelius, Roman Emperor (161–180)
- Commodus, Roman Emperor (177–192)
- Servius Cornelius Scipio Salvidienus Orfitus, Consul (178)
- Decimus Velius Rufus Iulianus, Consul (178)
- Roman Britain (Britannia Province)
  - Quintus Antistius Adventus, Roman governor (175–178)
  - Caerellius Priscus, Roman governor (178–181)
- Ægyptus Province – Titus Taius Sanctus, Roman Prefect (178–180)
- Syria Palaestina Province – Judah haNasi, Nasi of the Sanhedrin (165–220)
- Lower Moesia Province – Gaius Iunius Faustinus Placidus Postumianus, Roman governor (176–178)
Ulaid – Tipraiti Tireach, King of the Ulaid (136–187)