| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 6th century BC – 5th century BC – 4th century BC |
| Decades: | 520s BC 510s BC 500s BC – 490s BC – 480s BC 470s BC 460s BC |
| Years: | 494 BC 493 BC 492 BC – 491 BC – 490 BC 489 BC 488 BC |
| 491 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 491 BC |
| Ab urbe condita | 263 |
| Armenian calendar | N/A |
| Assyrian calendar | 4260 |
| Bahá'í calendar | -2334 – -2333 |
| Bengali calendar | -1083 |
| Berber calendar | 460 |
| English Regnal year | N/A |
| Buddhist calendar | 54 |
| Burmese calendar | -1128 |
| Byzantine calendar | 5018 – 5019 |
| Chinese calendar | 己酉年 (2146/2206) — to —
庚戌年(2147/2207) |
| Coptic calendar | -774 – -773 |
| Ethiopian calendar | -498 – -497 |
| Hebrew calendar | 3270 – 3271 |
| Hindu calendars | |
| - Bikram Samwat | -434 – -433 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2611 – 2612 |
| Holocene calendar | 9510 |
| Iranian calendar | 1112 BP – 1111 BP |
| Islamic calendar | 1146 BH – 1145 BH |
| Japanese calendar | |
| Korean calendar | 1843 |
| Minguo calendar | 2402 before ROC 民前2402年 |
| Thai solar calendar | 53 |
| Wikimedia Commons has media related to: 491 BC |
Year 491 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Augurinus and Atratinus (or, less frequently, year 263 Ab urbe condita). The denomination 491 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.
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