| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 6th century BC – 5th century BC – 4th century BC |
| Decades: | 450s BC 440s BC 430s BC – 420s BC – 410s BC 400s BC 390s BC |
| Years: | 424 BC 423 BC 422 BC – 421 BC – 420 BC 419 BC 418 BC |
| 421 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 421 BC |
| Ab urbe condita | 333 |
| Armenian calendar | N/A |
| Assyrian calendar | 4330 |
| Bahá'í calendar | -2264 – -2263 |
| Bengali calendar | -1013 |
| Berber calendar | 530 |
| English Regnal year | N/A |
| Buddhist calendar | 124 |
| Burmese calendar | -1058 |
| Byzantine calendar | 5088 – 5089 |
| Chinese calendar | 己未年 (2216/2276) — to —
庚申年(2217/2277) |
| Coptic calendar | -704 – -703 |
| Ethiopian calendar | -428 – -427 |
| Hebrew calendar | 3340 – 3341 |
| Hindu calendars | |
| - Bikram Samwat | -364 – -363 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2681 – 2682 |
| Holocene calendar | 9580 |
| Iranian calendar | 1042 BP – 1041 BP |
| Islamic calendar | 1074 BH – 1073 BH |
| Japanese calendar | |
| Korean calendar | 1913 |
| Minguo calendar | 2332 before ROC 民前2332年 |
| Thai solar calendar | 123 |
| Wikimedia Commons has media related to: 421 BC |
Year 421 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Vibulanus and Barbatus (or, less frequently, year 333 Ab urbe condita). The denomination 421 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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