List of state leaders in 38
AD 37 state leaders – Events of AD 38 – AD 39 state leaders – State leaders by year
Africa
Asia
Europe
- Athens
- Atrebates – Verica, King of the Atrebates (15–40)
- Bosporan Kingdom
- Cantiaci – Adminius, King of the Cantiaci (30–40)
- Catuvellauni – Cunobelinus, King of the Britons and King of the Catuvellauni (9–40)
- Caucasian Iberia – Mithridates, King of Caucasian Iberia (30–50)
- Ireland – Fíatach Finn, High King of Ireland (36–39)
- Odrysian kingdom
- Roman Empire (Principate – Julio-Claudian dynasty)
- Caligula, Roman Emperor (37–41)
- Marcus Aquila Iulianus, Consul (38)
- Publis Nonius Asprenas, Consul (38)
- Servius Asinius Celer, Consul suffectus (38)
- Sextus Nonius Quintilianus, Consul suffectus (38)
- Naevius Sutorius Macro, Praetorian prefect (31–38)
- Marcus Arrecinus Clemens, Praetorian prefect (38–41)
- Lucius Arruntius Stella, Praetorian prefect (38–41)
- Ægyptus Province – Aulus Avilius Flaccus, Roman Prefect (32–38)
- Judea (Iudaea Province)
- Syria Province – Lucius Vitellius, Roman Prefect (35–39)
- Ulaid – Fíatach Finn, King of the Ulaid (?–39)
Middle East