| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 4th century BC – 3rd century BC – 2nd century BC |
| Decades: | 290s BC 280s BC 270s BC – 260s BC – 250s BC 240s BC 230s BC |
| Years: | 269 BC 268 BC 267 BC – 266 BC – 265 BC 264 BC 263 BC |
| 266 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 266 BC |
| Ab urbe condita | 488 |
| Armenian calendar | N/A |
| Bahá'í calendar | -2109 – -2108 |
| Bengali calendar | -858 |
| Berber calendar | 685 |
| Buddhist calendar | 279 |
| Burmese calendar | -903 |
| Byzantine calendar | 5243 – 5244 |
| Chinese calendar | 甲年 (2371/2431) — to —
[[Sexagenary cycle|]]年(2372/2432) |
| Coptic calendar | -549 – -548 |
| Ethiopian calendar | -273 – -272 |
| Hebrew calendar | 3495 – 3496 |
| Hindu calendars | |
| - Bikram Samwat | -209 – -208 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2836 – 2837 |
| Holocene calendar | 9735 |
| Iranian calendar | 887 BP – 886 BP |
| Islamic calendar | 914 BH – 913 BH |
| Japanese calendar | |
| Korean calendar | 2068 |
| Thai solar calendar | 278 |