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|Millennium:||1st millennium BC|
Year 154 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Opimius and Albinus/Glabrio (or, less frequently, year 600 Ab urbe condita). The denomination 154 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.
- The Lusitanians harry the inhabitants of the Roman provinces in Hispania. At the same time, the Celtiberians of Numantia on the Douro revolt against their Roman occupation.
- After a two-year struggle, Attalus II Philadelphus of Pergamum is finally able to defeat Prusias II, the aggressive king of Bithynia in northern Anatolia. He is assisted in his battle against Prusias II by Ariarathes V of Cappadocia (who has sent his son Demetrius to command his forces) and by the Romans.
- After his victory, Attalus II insists on heavy reparations from Prusias II. In response, Prusias II sends his son Nicomedes to Rome to ask the Romans' help in reducing the amount of these reparations.
- The Egyptian king Ptolemy VI Philometor defeats his brother, Ptolemy VIII Euergetes, after he attempts to seize Cyprus by force. Nevertheless Philometor restores his brother to Cyrenaica, marries one of his daughters to him, and grants him a grain subsidy.