| 257 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 257 BC |
| Ab urbe condita | 497 |
| Armenian calendar | N/A |
| Assyrian calendar | 4494 |
| Bahá'í calendar | -2100–-2099 |
| Bengali calendar | -849 |
| Berber calendar | 694 |
| English Regnal year | N/A |
| Buddhist calendar | 288 |
| Burmese calendar | -894 |
| Byzantine calendar | 5252–5253 |
| Chinese calendar | 癸卯年 (2380/2440) — to —
甲辰年(2381/2441) |
| Coptic calendar | -540–-539 |
| Ethiopian calendar | -264–-263 |
| Hebrew calendar | 3504–3505 |
| Hindu calendars | |
| - Bikram Samwat | -200–-199 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2845–2846 |
| Holocene calendar | 9744 |
| Iranian calendar | 878 BP – 877 BP |
| Islamic calendar | 905 BH – 904 BH |
| Japanese calendar | |
| Korean calendar | 2077 |
| Minguo calendar | 2168 before ROC 民前2168年 |
| Thai solar calendar | 287 |
| Wikimedia Commons has media related to: 257 BC |
Year 257 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Regulus and Blasio (or, less frequently, year 497 Ab urbe condita). The denomination 257 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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