| Millennium: | 1st millennium |
|---|---|
| Centuries: | 2nd century – 3rd century – 4th century |
| Decades: | 220s 230s 240s – 250s – 260s 270s 280s |
| Years: | 252 253 254 – 255 – 256 257 258 |
| 255 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 255 CCLV |
| Ab urbe condita | 1008 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1589 – -1588 |
| Bengali calendar | -338 |
| Berber calendar | 1205 |
| Buddhist calendar | 799 |
| Burmese calendar | -383 |
| Byzantine calendar | 5763 – 5764 |
| Chinese calendar | 甲戌年十二月初六日 (2891/2951-12-6) — to —
乙亥年十一月十六日(2892/2952-11-16) |
| Coptic calendar | -29 – -28 |
| Ethiopian calendar | 247 – 248 |
| Hebrew calendar | 4015 – 4016 |
| Hindu calendars | |
| - Bikram Samwat | 311 – 312 |
| - Shaka Samvat | 177 – 178 |
| - Kali Yuga | 3356 – 3357 |
| Holocene calendar | 10255 |
| Iranian calendar | 367 BP – 366 BP |
| Islamic calendar | 378 BH – 377 BH |
| Japanese calendar | |
| Korean calendar | 2588 |
| Thai solar calendar | 798 |