|Millennium:||1st millennium BC|
|Centuries:||6th century BC – 5th century BC – 4th century BC|
|Decades:||510s BC 500s BC 490s BC – 480s BC – 470s BC 460s BC 450s BC|
|Years:||489 BC 488 BC 487 BC – 486 BC – 485 BC 484 BC 483 BC|
|486 BC by topic|
|Gregorian calendar||486 BC|
|Ab urbe condita||268|
|Ancient Egypt era||XXVII dynasty, 40|
|- Pharaoh||Darius I of Persia, 36|
|Ancient Greek era||73rd Olympiad, year 3|
|Chinese calendar||甲寅年 (Wood Tiger)
2211 or 2151
— to —
乙卯年 (Wood Rabbit)
2212 or 2152
|Coptic calendar||−769 – −768|
|Ethiopian calendar||−493 – −492|
|- Vikram Samvat||−429 – −428|
|- Shaka Samvat||N/A|
|- Kali Yuga||2616–2617|
|Iranian calendar||1107 BP – 1106 BP|
|Islamic calendar||1141 BH – 1140 BH|
|Minguo calendar||2397 before ROC
|Thai solar calendar||57–58|
|Wikimedia Commons has media related to 486 BC.|
Year 486 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Viscellinus and Rutilus (or, less frequently, year 268 Ab urbe condita). The denomination 486 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.
- Egypt revolts against Persian rule upon the death of king Darius I. The revolts, probably led by Libyans of the western Delta, are crushed the next year by Xerxes, who reduces Egypt to the status of a conquered province.
- Rome enters into a new treaty with the Hernici.
- During his third consulate, the Roman consul Spurius Cassius Viscellinus proposes an agrarian law to assist needy plebeians. The proposal is vehemently opposed by the patricians including the other consul Proculus Verginius Tricostus Rutilus, and the plebs turn against the proposal. In the following year Cassius is condemned and executed for high treason.
- The first part of the Grand Canal of China is built during the reign of King Fuchai of Wu. It links the Yangtze River with the Huai River, and is a measure to ship amble amount of supplies north for intended wars with the northern states of Song and Lu.
- The construction of a relief in the Apadana, a ceremonial complex at Persepolis, is finished. It shows Darius and Xerxes receiving tribute and is now kept in the Iranbustan Museum in Tehran.
- Darius I, king of the Persian Achaemenid Empire (b. 550 BCE)
- Spurius Cassius Vecellinus, Roman consul (executed)