| Millennium: | 1st millennium |
|---|---|
| Centuries: | 2nd century – 3rd century – 4th century |
| Decades: | 220s 230s 240s – 250s – 260s 270s 280s |
| Years: | 251 252 253 – 254 – 255 256 257 |
| 254 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 254 CCLIV |
| Ab urbe condita | 1007 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1590 – -1589 |
| Bengali calendar | -339 |
| Berber calendar | 1204 |
| Buddhist calendar | 798 |
| Burmese calendar | -384 |
| Byzantine calendar | 5762 – 5763 |
| Chinese calendar | 癸酉年十一月廿五日 (2890/2950-11-25) — to —
甲戌年十二月初五日(2891/2951-12-5) |
| Coptic calendar | -30 – -29 |
| Ethiopian calendar | 246 – 247 |
| Hebrew calendar | 4014 – 4015 |
| Hindu calendars | |
| - Bikram Samwat | 310 – 311 |
| - Shaka Samvat | 176 – 177 |
| - Kali Yuga | 3355 – 3356 |
| Holocene calendar | 10254 |
| Iranian calendar | 368 BP – 367 BP |
| Islamic calendar | 379 BH – 378 BH |
| Japanese calendar | |
| Korean calendar | 2587 |
| Thai solar calendar | 797 |