Look up imperium in Wiktionary, the free dictionary.
Imperium refers to a legal concept of authority in Roman antiquity
Imperium may also refer to:
- the authority of an imperator, as a special class of official in the Roman Republic
- during the Roman Empire, the authority of the Roman emperors
- Imperium Romanum, the Roman Empire
- Imperium Romanum Sacrum, the Holy Roman Empire
- any Empire