List of state leaders in 55
AD 54 state leaders – Events of AD 55 – AD 56 state leaders – State leaders by year
Africa
Asia
Europe
- Athens – Conon, Archon of Athens (55–56)
- Bosporan Kingdom – Tiberius Julius Cotys I, Roman client King of Bosporus (46–63)
- Brigantes – Cartimandua, Queen of the Brigantes (43–69)
- Caucasian Iberia – Pharsman, King of Caucasian Iberia (50–58)
- Iceni – Prasutagus, King of the Iceni (47–60)
- Ireland – Fíachu Finnolach, High King of Ireland (39–56)
- Regnenses – Tiberius Claudius Cogidubnus, King of the Britons (50–?) and King of the Regnenses (43–?)
- Roman Empire (Principate – Julio-Claudian dynasty)
- Nero, Roman Emperor (54–68)
- Nero, Consul (55)
- Lucius Antistius Vetus, Consul (55)
- Numerius Cestius, Consul suffectus (55)
- Seneca the Younger, Consul suffectus (55)
- Publis Cornelius Dolabella, Consul suffectus (55)
- Marcus Trebellius Maximus, Consul suffectus (55)
- Publis Palfurius, Consul suffectus (55)
- Gnaeus Cornelius Lentulus Gaetulicus, Consul suffectus (55)
- Titus Curtilius Mancia, Consul suffectus (55)
- Sextus Afranius Burrus, Praetorian prefect (50–62)
- Roman Britain (Britannia Province) – Aulus Didius Gallus, Roman governor (52–57)
- Ægyptus Province – Tiberius Claudius Balbilus, Roman Prefect (55–59)
- Judea (Iudaea Province)
- Syria Province – Gaius Ummidius Durmius Quadratus, Roman governor (50–60)
Middle East
- Adiabene
- Armenia – Tiridates I, King of Armenia (53, 54–58, 62–72)
- Armenia Minor – Aristobulus of Chalcis, King of Armenia Minor (55–72)
- Characene – Attambalos IV, King of Characene (54–65)
- Commagene – Antiochus IV, King of Commagene (38, 41–72)
- Nabatea – Malichus II, King of Nabatea (40–70)
- Osroene – Ma'nu V, King of Osroene (50–57)
- Parthian Empire
- Pontus – Polemon II, King of Pontus (38–64)