|Millennium:||1st millennium BC|
|80 BC by topic|
|Wikimedia Commons has media related to 80 BC.|
Year 80 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Sulla and Metellus (or, less frequently, year 674 Ab urbe condita). The denomination 80 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
- Quintus Sertorius re-enter Iberia with a tiny army (2,600 men) and opens a successful campaign against the Sullan forces.
- Battle of the Baetis River: A force of Democratic exiles under Sertorius defeat the legal Roman army of Lucius Fulfidias in Hispania, starting the Sertorian War; Quintus Metellus Pius takes command on behalf of Sulla.
- Pompeii becomes the Roman colony Colonia Cornelia Veneria Pompei.
- Ptolemy XII Auletes succeeds Ptolemy XI Alexander II to the throne of Egypt.
- Alexandria comes under Roman jurisdiction.
- Roman artists begin to extend the space of a room visually with painted scenes of figures on a shallow stage or with a landscape or cityscape.