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| 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: | 423 BC 422 BC 421 BC - 420 BC - 419 BC 418 BC 417 BC |
| 420 BC by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 420 BC |
| Ab urbe condita | 334 |
| Armenian calendar | N/A |
| Bahá'í calendar | -2263 – -2262 |
| Berber calendar | 531 |
| Buddhist calendar | 125 |
| Burmese calendar | -1057 |
| Byzantine calendar | 5089 – 5090 |
| Chinese calendar | [[Sexagenary cycle|]]年 (2217/2277) — to —
[[Sexagenary cycle|]]年(2218/2278) |
| Coptic calendar | -703 – -702 |
| Ethiopian calendar | -427 – -426 |
| Hebrew calendar | 3341 – 3342 |
| Hindu calendars | |
| - Vikram Samvat | -364 – -363 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2682 – 2683 |
| Holocene calendar | 9581 |
| Iranian calendar | 1041 BP – 1040 BP |
| Islamic calendar | 1073 BH – 1072 BH |
| Japanese calendar | |
| Korean calendar | 1914 |
| Thai solar calendar | 124 |
Events
By place
Greece
- The young and popular Alcibiades is elected "Strategos" (one of a board of ten generals) and begins to dominate Athenian life and politics. A Quadruple Alliance of Athens, Argos, Mantineia and Elis, which has been organised by Alcibiades (in opposition to Nicias) confronts a Spartan-Boeotian alliance.
By topic
Drama
- Euripides' play The Suppliant Women is performed.
Births
Deaths
