List of state leaders in 21

This is a list of heads of state, government leaders, and other rulers in the year 21.

Africa

• Kush – Shorkaror, King of Kush (c.20–30)
• Mauretania – Juba II, King of Mauretania (25 BC–AD 23)

Asia

• China – Wang Mang, Emperor of China (8–23)
• Japan (Legendary Emperors) – Suinin, Emperor of Japan (29 BC–AD 70)
• Korea –
  • Baekje – Onjo, King of Baekje (18 BC– AD 28)
  • Dongbuyeo – Daeso, King of Dongbuyeo (7 BC– AD 22)
  • Goguryeo – Daemusin, King of Goguryeo (18–44)
  • Silla – Namhae, King of Silla (4–24)
• Kushan Empire – Heraios, King of Kush (1–30)

Europe

• Atrebates – Verica, King of the Atrebates (15–40)
• Bosporan Kingdom – Tiberius Julius Aspurgus, Roman client King of Bosporus (8 BC–38 AD)
• Catuvellauni – Cunobelinus, King of the Britons and King of the Catuvellauni (9–40)
• Caucasian Iberia – Aderk, King of Caucasian Iberia (1–30)
• Ireland – Feradach Finnfechtnach, High King of Ireland (14–36)
• Odrysian kingdom
  • Rhoemetalces II, Odrysian King of Thrace (18–38)
  • Antonia Tryphaena, Odrysian Queen of Thrace (18–38)
• Roman Empire (Principate – Julio-Claudian dynasty)
  • Tiberius, Roman Emperor (14–37)
  • Tiberius, Consul (21)
  • Drusus Julius Caesar, Consul (21)
  • Mamercus Aemilius Scaurus, Consul suffectus (21)
  • Gnaeus Tremelius, Consul suffectus (21)
  • Sejanus, Praetorian prefect (14–31)
  • Africa Province
    • Lucius Apronius, Roman governor (19–21)
    • Junius Blaesus, Roman governor (21–23)
  • Ægyptus Province – Gaius Valerius, Roman Prefect (16–31)
  • Judea (Iudaea Province)
    • Valerius Gratus, Roman Prefect (15–26)
    • Herod Antipas, Tetrarch of Galilee (4 BC–39 AD)
    • Herod Philip I, Tetrarch of Batanaea (4 BC–34 AD)
    • Herod Philip II, Tetrarch of Ituraea and Trachonitis (4 BC–34 AD)
    • Caiaphas, High Priest of Judea (18–36)
    • Shammai, Nasi of the Sanhedrin (20–30)
• Syria Province – Gnaeus Sentius Saturninus, Roman Prefect (19–21)

Middle East

• Adiabene – Monobaz I, King of Adiabene (20–30)
• Armenia – Artaxias III, King of Armenia (Roman protectorate) (18–34)
• Characene – Abinergaos I, King of Characene (10–23)
• Commagene – Interregnum – Roman rule (17–38)
• Nabatea – Aretas IV Philopatris, King of Nabatea (9 BC–40 AD)
• Osroene – Abgar V of Edessa, King of Osroene (4 BC–7 AD, 13–50)
• Parthian Empire – Artabanus III, Great King (Shah) of Parthia (10–35, 36–38)
• Pontus – Pythodorida, King of Pontus (8 BC–38 AD)