- One of two persons jointly exercising the same office in Republican Rome.
- For the ancient Roman dual magistracy, see Duoviri
The tiny European nation of Andorra is technically a duumvirate, as it is ruled by two co-princes (one of whom is the President of France), although the Andorran prime minister actually wields power as the head of government. Duumvirates in history include the city-states of Carthage, ruled by two mayors, and ancient Rome, ruled by two Consuls.
In the fictional Middle-earth legendarium of author J.R.R. Tolkien, the Black Númenóreans' coastal city of Umbar was typically ruled by a duumvirate.
Some political parties have duumvirates, sometimes, such as is the case of Lindsey German and John Rees in the Socialist Workers Party in Britain.
duumvir in Ukrainian: Дуумвірат
duumvir in Spanish: Duunvirato