Domitian was a Roman emperor of the Flavian dynasty who reigned 81–96.
Domitian or Domitianus may also refer to:
- Domitianus (usurper), a 3rd-century usurper of the Roman Empire
- Domitius Domitianus, another usurper and Roman emperor in Egypt 296–297
- Domitian of Huy, a Gaulish bishop of the 6th century
- Domitian of Carantania, a founder of the Millstatt Abbey