| 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: | 431 BC 430 BC 429 BC – 428 BC – 427 BC 426 BC 425 BC |
| 428 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 428 BC |
| Ab urbe condita | 326 |
| Armenian calendar | N/A |
| Assyrian calendar | 4323 |
| Bahá'í calendar | -2271 – -2270 |
| Bengali calendar | -1020 |
| Berber calendar | 523 |
| English Regnal year | N/A |
| Buddhist calendar | 117 |
| Burmese calendar | -1065 |
| Byzantine calendar | 5081 – 5082 |
| Chinese calendar | 壬子年 (2209/2269) — to —
癸丑年(2210/2270) |
| Coptic calendar | -711 – -710 |
| Ethiopian calendar | -435 – -434 |
| Hebrew calendar | 3333 – 3334 |
| Hindu calendars | |
| - Bikram Samwat | -371 – -370 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2674 – 2675 |
| Holocene calendar | 9573 |
| Iranian calendar | 1049 BP – 1048 BP |
| Islamic calendar | 1081 BH – 1080 BH |
| Japanese calendar | |
| Korean calendar | 1906 |
| Minguo calendar | 2339 before ROC 民前2339年 |
| Thai solar calendar | 116 |
| Wikimedia Commons has media related to: 428 BC |
Year 428 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Cossus and Cincinnatus or Cincinnatus and Atratinus (or, less frequently, year 326 Ab urbe condita). The denomination 428 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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