| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 4th century BC – 3rd century BC – 2nd century BC |
| Decades: | 280s BC 270s BC 260s BC – 250s BC – 240s BC 230s BC 220s BC |
| Years: | 260 BC 259 BC 258 BC – 257 BC – 256 BC 255 BC 254 BC |
| 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 |
| Bahá'í calendar | -2100 – -2099 |
| Bengali calendar | -849 |
| Berber calendar | 694 |
| Buddhist calendar | 288 |
| Burmese calendar | -894 |
| Byzantine calendar | 5252 – 5253 |
| Chinese calendar | [[Sexagenary cycle|]]年 (2380/2440) — to —
甲年(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 |
| Thai solar calendar | 287 |