List of state leaders in 100
AD 99 state leaders – Events of AD 100 – AD 101 state leaders – State leaders by year
Africa
Asia
Europe
- Athens
- Bosporan Kingdom – Tiberius Julius Sauromates I, Roman client King of Bosporus (90–123)
- Caucasian Iberia – Azork, King of Caucasian Iberia (87–106)
- Dacia – Decebalus, King of Dacia (87–106)
- Ireland – Túathal Techtmar, High King of Ireland (76–106)
- Roman Empire (Principate – Nervan-Antonian dynasty)
- Trajan, Roman Emperor (98–117)
- Trajan, Consul (100)
- Sextus Iulius Frontinus, Consul (100)
- Lucius Iulius Ursus, Consul suffectus (100)
- Marcus Marcius Macer, Consul suffectus (100)
- Gaius Cilnius Proculus, Consul suffectus (100)
- Lucius Herennius Saturninus, Consul suffectus (100)
- Titus Pomponius Mamilianus, Consul suffectus (100)
- Quintus Acutius Nerva, Consul suffectus (100)
- Lucius Fabius Tuscus, Consul suffectus (100)
- Gaius Iulius Cornutus Tertullus, Consul suffectus (100)
- Pliny the Younger, Consul suffectus (100)
- Lucius Roscius Aelianus Maecius Celer, Consul suffectus (100)
- Tiberius Claudius Sacerdos Iulianus, Consul suffectus (100)
- Sextus Attius Suburanus, Praetorian prefect (98–101)
- Roman Britain (Britannia Province) – Tiberius Avidius Quietus, Roman governor (97–101)
- Ægyptus Province
- Judea (Iudaea Province)
- Lower Moesia Province – Manius Laberius Maximus, Roman governor (c. 100)
Middle East